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MAX98088 stereo audio codec with flexsound technology _________________________________________________________________ maxim integrated products 1 simplified block diagram 19-5335; rev 1; 6/11 general description the MAX98088 is a full-featured audio codec whose high performance and low power consumption make it ideal for portable applications. class d speaker amplifiers provide efficient amplification for two speakers. low radiated emissions enable com - pletely filterless operation. integrated bypass switches optionally connect an external amplifier to the transducer when the class d amplifiers are disabled. the ic features a stereo class h headphone amplifier that utilizes a dual-mode charge pump to maximize effi - ciency while outputting a ground referenced signal that does not require output coupling capacitors. the ic also features a mono differential amplifier that can also be configured as a stereo line output. two differential analog microphone inputs are available as well as support for two pdm digital microphones. integrated switches allow for an additional microphone input as well as microphone signals to be routed out to external devices. two flexible single-ended or differential line inputs may be connected to an fm radio or other sources. integrated flexsound k technology improves loudspeak - er performance by optimizing the signal level and fre - quency response while limiting the maximum distortion and power at the output to prevent speaker damage. automatic gain control (agc) and a noise gate optimize the signal level of microphone input signals to make best use of the adc dynamic range. the device is fully specified over the -40 n c to +85 n c extended temperature range. features s 5.6mw power comsumption (dac to hp at 97db dr) s 101db dr stereo dac (8khz < f s < 96khz) s 93db dr stereo adc (8khz < f s < 96khz) s stereo low emi class d amplifiers 950mw/channel (8 i , v spkvdd_ = 4.2v) s efficient class h headphone amplifier s differential receiver amplifier/stereo line outputs s 2 stereo single-ended/mono differential line inputs s 3 differential microphone inputs s flexsound technology 5-band parametric eq automatic level control (alc) excursion limiter speaker power limiter speaker distortion limiter microphone automatic gain control and noise gate s dual i 2 s/pcm/tdm digital audio interfaces s asynchronous digital mixing s supports master clock frequencies from 10mhz to 60mhz s rf immune analog inputs and outputs s extensive click-and-pop reduction circuitry s available in 63-bump wlp package (3.80mm x 3.30mm, 0.4mm pitch) flexsound is a trademark of maxim integrated products, inc. ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX98088.related . evaluation kit available di gi ta l mi cr ophon e in pu t + + li ne in a1 li ne in a2 li ne in b1 li ne in b2 dac dac mix receive r/ lineout amps speaker amp speaker amp headphone amp headphone amp adc adc mix flexsound technology ? 5-band parametric eq? automatic level control ? loudspeaker processin g ? excursion limiter? thd limiter ? power limiter ? microphone processing ? automatic gain control? noise gate ? asynchronous digital mixing i 2 c control i 2 s/pcm digital audio interface i 2 s/pcm MAX98088 digital audio interface for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim?s website at www.maxim-ic.com. downloaded from: http:///
_________________________________________________________________ maxim integrated products 2 MAX98088 stereo audio codec with flexsound technology general description ............................................................................ 1 features ..................................................................................... 1 simplified block diagram ........................................................................ 1 functional diagram ............................................................................ 5 absolute maximum ratings ...................................................................... 6 electrical characteristics ........................................................................ 6 digital input/output characteristics ............................................................... 19 input clock characteristics ..................................................................... 21 audio interface timing characteristics ............................................................ 22 digital microphone timing characterstics .......................................................... 23 i 2 c timing characterstics ...................................................................... 24 power consumption ........................................................................... 25 typical operating characteristics ................................................................ 28 microphone to adc .......................................................................... 28 line to adc ................................................................................ 32 line-in pin direct to adc ..................................................................... 33 digital loopback ............................................................................ 33 analog loopback ........................................................................... 34 dac to receiver ............................................................................ 35 line to receiver ............................................................................ 37 dac to line output .......................................................................... 38 line to line output .......................................................................... 38 dac to speaker ............................................................................. 39 line to speaker ............................................................................. 43 dac to headphone .......................................................................... 44 line to headphone .......................................................................... 51 speaker bypass switch ...................................................................... 52 pin configuration ............................................................................. 53 pin description ............................................................................... 54 detailed description ........................................................................... 56 i 2 c slave address ........................................................................... 57 registers .................................................................................. 57 power management ......................................................................... 63 microphone inputs .......................................................................... 65 line inputs ................................................................................. 67 adc input mixers ........................................................................... 68 table of contents downloaded from: http:///
_________________________________________________________________ maxim integrated products 3 MAX98088 stereo audio codec with flexsound technology record path signal processing ................................................................. 69 microphone agc ......................................................................... 69 noise gate .............................................................................. 69 adc record level control .................................................................... 72 sidetone .................................................................................. 73 digital audio interfaces ....................................................................... 74 clock control ............................................................................... 81 sample rate converter ....................................................................... 84 passband filtering ........................................................................... 85 playback path signal processing ............................................................... 88 automatic level control .................................................................... 88 parametric equalizer ...................................................................... 89 playback level control ....................................................................... 91 dac input mixers ........................................................................... 92 receiver amplifier ........................................................................... 93 receiver output mixer ..................................................................... 94 receiver output volume ................................................................... 95 speaker amplifiers .......................................................................... 96 speaker output mixers .................................................................... 97 speaker amplifier signal processing ............................................................ 98 excursion limiter ......................................................................... 98 speaker output volume .................................................................... 98 power limiter ........................................................................... 101 distortion limiter ........................................................................ 102 headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 directdrive headphone amplifier ........................................................... 103 charge pump ........................................................................... 103 class h operation ....................................................................... 104 headphone output mixers ................................................................. 105 headphone output volume ................................................................ 106 output bypass switches ..................................................................... 107 click-and-pop reduction .................................................................... 108 jack detection ............................................................................. 109 jack detection and removal ............................................................... 109 battery measurement ....................................................................... 110 device status ............................................................................. 111 table of contents (continued) downloaded from: http:///
_________________________________________________________________ maxim integrated products 4 MAX98088 stereo audio codec with flexsound technology i 2 c serial interface ......................................................................... 112 bit transfer ............................................................................. 112 start and stop conditions ............................................................... 112 early stop conditions .................................................................... 112 device revision ............................................................................ 112 slave address .......................................................................... 113 acknowledge ........................................................................... 113 write data format ....................................................................... 113 read data format ....................................................................... 114 applications information ........................................................................ 115 typical operating circuits .................................................................... 115 filterless class d operation .................................................................. 117 rf susceptibility ........................................................................... 117 startup/shutdown sequencing ................................................................ 117 component selection ....................................................................... 118 optional ferrite bead filter ................................................................ 118 input capacitor .......................................................................... 118 charge-pump capacitor selection .......................................................... 118 charge-pump flying capacitor ............................................................. 119 charge-pump holding capacitor ........................................................... 119 unused pins .............................................................................. 119 recommended pcb routing ................................................................. 120 supply bypassing, layout, and grounding ...................................................... 120 wlp applications information ................................................................. 121 ordering information ......................................................................... 121 package information .......................................................................... 122 revision history ............................................................................. 123 table of contents (continued) downloaded from: http:///
_________________________________________________________________ maxim integrated products 5 MAX98088 stereo audio codec with flexsound technology functional diagram sda scl i 2 c e5f5f4 e2 mclk clock control g8 mic2n g9 mic2p f8 e6 jacksns jack detection jdeten mben f7 mi cb ia s reg inabyp mic2byp pgam2: +20db to 0db pgam1: +20db to 0db pa2en:0/20/30db extmic pa1en:0/20/30db extmic mic1n/digmicclk e8 mic1p/digmicdata dsts mas1 dai1 sel1 sel2 bclk1 bclks1 d1 d4 d2 e4 e1 f2 f3 g1 g3 g2 lrclk1 sdout1 sdin1 sidetone dvst:0db to -60db lten1 lben2 automatic gain control eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db flexsound tm technology multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dgnd agnd n.c. f1 g7 c6, c7, d5, d6, d7, e3 dacr + + bit clock frame clock data output data input mas1 hizoff1 mas2 dai2 bclk2 lrclk2 sdout2 sdin2 bit clock frame clock data output data input mas2 hizoff2 sdien1 sdien2 lrclks1 sdouts1 sdins1 dvdds1 bclks2 lrclks2 sdouts2 sdins2 dvdds2 g4 dvdd g5 avdd mux lben1 re fg 6 f6 re g bias MAX98088 noise gate mode1 avflt srmix_ mode avlg: 0/6/ 12/18db avl:0db to -15db avrg: 0/6/12/18db avr:0db to -15db audio/ voice filters audio filters audio/ voice filters mix mix mixdal mix irq adren adlen mix mixadl mixadr mix adcr adcl inbdiff pgainb:+20db to -6db d8 inb2 e7 inb1 e9 ina2/extmicn f9 ina1/extmicp + pgainb:+20db to -6db inadiff pgaina:+20db to -6db + pgaina:+20db to -6db mixrecr mix mixrecl mix mixspr mix mixspl mix mixhpr mix 0db 0db recvoll:+8db to -62db reclenrecren recvolr:+8db to -62db recbyp spkbyp recp/ loutl/ rxinp a6 recn/ loutr/ rxinn b6 mixhpl mix spklp spkln spvoll:+8db to -62db linemode a4, b4 spklvdd a3, b3a5, b5 spklgnd c4, c5 spkrvdd c3, d3 spkrp c1, c2 spkrn a1, b1 splenspren po we r/ di st or ti on li mi te r spvolr:+8db to -62db mixhpl_ path sel mixhpr_ path sel spkrgnd a2, b2 pvdd a7 hpgnd a9 b7b8a8 hpvss b9 hpvdd c1n c1p charge pump hpvoll:+3db to -67db hpl hpsns c9c8 hplen hpvor:+3db to -67db hpr d9 hpren +6db +6db sample rate converter port s2 port s1 downloaded from: http:///
_________________________________________________________________ maxim integrated products 6 MAX98088 stereo audio codec with flexsound technology (voltages with respect to agnd.)dvdd, avdd, pvdd, hpvdd .............................. -0.3v to +2.2v spklvdd, spkrvdd, dvdds1, dvdds2 .......... -0.3v to +6.0v dgnd, hpgnd, spklgnd, spkrgnd .............. -0.1v to +0.1v hpvss ............................... (hpgnd - 2.2v) to (hpgnd + 0.3v) c1n .................................... (hpvss - 0.3v) to (hpgnd + 0.3v) c1p ..................................... (hpgnd - 0.3v) to (hpvdd + 0.3v) ref, micbias ................................. -0.3v to (spklvdd + 0.3v) mclk, sdins1, sdins2, jacksns, sda, scl, irq ................................................. -0.3v to +6.0v lrclks1, bclks1, sdouts1 ......... -0.3v to (dvdds1 + 0.3v) lrclks2, bclks2, sdouts2 ......... -0.3v to (dvdds2 + 0.3v) reg, ina1/extmicp, ina2/extmicn, inb1, inb2, mic1p/digmicdata, mic1n/digmicclk, mic2p, mic2n .................................................. -0.3v to +2.2v hpsns ............................... (hpgnd - 0.3v) to (hpgnd + 0.3v) hpl, hpr ............................ (hpvss - 0.3v) to (hpvdd + 0.3v) recp/loutl/rxinp, recn/loutr/ rxinn ..................... (spklgnd - 0.3v) to (spklvdd + 0.3v) spklp, spkln ........... (spklgnd - 0.3v) to (spklvdd + 0.3v) spkrp, spkrn ......... (spkrgnd - 0.3v) to (spkrvdd + 0.3v) continuous power dissipation (t a = +70 n c) 63-bump wlp (derate 25.6mw/ n c above +70 n c) ........ 2.05w operating temperature range .......................... -40 n c to +85 n c storage temperature range ............................ -65 n c to +150 n c soldering temperature (reflow) ...................................... +260 n c absolute maximum ratingsstresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional opera - tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. electrical characteristics (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units power supply supply voltage range guaranteed by psrr v spklvdd , v spkrvdd 2.8 5.5 v v dvdd , v avdd , v pvdd 1.65 1.8 2 v dvdds1 , v dvdds2 1.65 3.6 total supply current(notes 2 and 3) i vdd full-duplex 8khz mono, receiver output, mas = 1 analog 4.5 8 ma speaker 1.6 2.3 digital 1.3 2 dac playback 48khzstereo, headphone outputs, mas = 1 analog 1.9 3 speaker 0.001 0.0058 digital 2.47 3.5 dac playback 48khz stereo, speaker outputs, mas = 1 analog 3.6 6.5 speaker 6.41 8.5 digital 2.49 3.5 shutdown supply current (note 2) t a = +25 n c analog 0.2 2 f a speaker 0.01 1 digital 1 5 ref voltage 2.5 v reg voltage 0.79 v shutdown to full operation vsen = 0 30 ms vsen = 1 17 downloaded from: http:///
_________________________________________________________________ maxim integrated products 7 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units microphone to adc pathdynamic range dr f s = 8khz, mode = 0 (iir voice), av micpre_ = 0db (note 4) 88 db total harmonic distortion + noise thd+n v in = 0.1v p-p , f s = 8khz, f = 1khz -78 db av micpre_ = 0db, v in = 1v p-p , f = 1khz -85 av micpre_ = +30db, v in = 32mv p-p , f = 1khz -71 common-mode rejection ratio cmrr v in = 100mv p-p , f = 217hz 74 db power-supply rejection ratio psrr v avdd = 1.65v to 1.95v, input referred, mic inputs floating 50 62 db f = 217hz, v ripple = 200mv p-p , input referred 62 f = 1khz, v ripple = 200mv p-p , input referred 62 f = 10khz, v ripple = 200mv p-p , input referred 53 path phase delay 1khz, 0db input, highpass filter disabled measured from analog input to digital output mode = 0 (iir voice) 8khz 2.2 ms mode = 0 (iir voice) 16khz 1.1 mode = 1 (fir audio) 8khz 4.5 mode = 1 (fir audio) 48khz 0.76 microphone preampfull-scale input av micpre_ = 0db 1.05 v p-p preamplifier gain av micpre_ (note 5) pa1en/pa2en = 01 0 db pa1en/pa2en = 10 19.5 20 20.5 pa1en/pa2en = 11 29.5 30 30.5 pga gain av micpga_ (note 5) pgam1/pgam2 = 0x00 19 20 21 db pgam1/pgam2 = 0x14 0 mic input resistance r in_mic all gain settings, measured at mic1p/ mic1n/mic2p/mic2n 50 k i downloaded from: http:///
_________________________________________________________________ maxim integrated products 8 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units microphone biasmicbias output voltage v micbias i load = 1ma 2.15 2.2 2.25 v load regulation i load = 1ma to 2ma 0.5 4.5 mv line regulation v spklvdd = 2.8v to 5.5v 110 f v ripple rejection f = 217hz, v ripple (spklvdd) = 100mv p-p 92 db f = 10khz, v ripple (spklvdd) = 100mv p-p 83 noise voltage a-weighted, f = 20hz to 20khz 3.9 f v rms p-weighted, f = 20hz to 4khz 2.1 f = 1khz 50 nv/ hz microphone bypass switch on-resistance r on i mic1_ = 100ma, inabyp = mic2byp = 1, v mic2_ = v ina_ = 0v, avdd, t a = +25 n c 5 30 i total harmonic distortion + noise thd+n v in = 2v p-p , v cm = 0.9v, r l = 10k i , f = 1khz, inabyp = mic2byp = 1 -80 db off-isolation v in = 2v p-p , v cm = 0.9v, r l = 10k i , f = 1khz 60 db off-leakage current v mic1_ = [0v, avdd], v mic2_ /v ina_ = [avdd, 0v] -1 +1 f a line input to adc pathdynamic range (note 4) dr ina pin direct, f s = 48khz, mode = 1 (fir audio) 93 db total harmonic distortion + noise thd+n v in = 1v p-p , f = 1khz -82 -74 db gain error dc accuracy 1 % power-supply rejection ratio psrr v avdd = 1.65v to 1.95v, input referred, line inputs floating, t a = +25 n c 57 68 db f = 217hz, v ripple = 200mv p-p , av adc = 0db, input referred 63 f = 1khz, v ripple = 200mv p-p , av adc = 0db, input referred 63 f = 10khz, v ripple = 200mv p-p , av adc = 0db, input referred 57 downloaded from: http:///
_________________________________________________________________ maxim integrated products 9 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units line input preampfull-scale input v in av pgain_ = 0db 1 v p-p av pgain_ = -6db 1.4 level adjust gain av pgain_ t a = +25 n c (note 5) pgaina/pgainb = 0x0 19 20 21 db pgaina/pgainb = 0x1 13 14 15 pgaina/pgainb = 0x2 2 3 4 pgaina/pgainb = 0x3 0 pgaina/pgainb = 0x4 -4 -3 -2 pgaina/pgainb = 0x5, 0x6, 0x7 -7 -6 -5 input resistance r in av pgain_ = +20db 14.5 21 28 k i av pgain_ = +14db 20 av pgain_ = +3db 20 av pgain_ = 0db 7.5 10 14 av pgain_ = -3db 20 av pgain_ = -6db 20 feedback resistance r in_fb inaext/inbext = 1 t a = +25 n c 18 20 22 k i t a = t min to t max 16 24 adc level controladc level adjust range av adclvl avl/avr = 0xf to 0x0 (note 5) -12 +3 db adc level step size 1 db adc gain adjust range av adcgain avlg/avrg = 00 to 11 (note 5) 0 18 db adc gain adjust step size 6 db adc digital filtersvoice mode iir lowpass filter (mode1 = 0) passband cutoff f plp ripple limit cutoff 0.441 x fs hz -3db cutoff 0.449 x fs passband ripple f < f plp -0.1 +0.1 db stopband cutoff f slp 0.47 x f s hz stopband attenuation(note 6) f > f slp 74 db downloaded from: http:///
________________________________________________________________ maxim integrated products 10 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units voice mode iir highpass filter (mode1 = 0)passband cutoff (-3db from peak) f ahppb avflt = 0x1 (elliptical tuned for f s = 16khz + 217hz notch) 0.0161 x f s hz avflt = 0x2 (500hz butterworth tuned for f s = 16khz) 0.0319 x f s avflt = 0x3 (elliptical tuned for f s = 8khz + 217hz notch) 0.0321 x f s avflt = 0x4 (500hz butterworth tuned for f s = 8khz) 0.0632 x f s avflt = 0x5 (f s /240 butterworth) 0.0043 x f s stopband cutoff(-30db from peak) f ahpsb avflt = 0x1 (elliptical tuned for f s = 16khz + 217hz notch) 0.0139 x f s hz avflt = 0x2 (500hz butterworth tuned for f s = 16khz) 0.0156 x f s avflt = 0x3 (elliptical tuned for f s = 8khz + 217hz notch) 0.0279 x f s avflt = 0x4 (500hz butterworth tuned for f s = 8khz) 0.0312 x f s avflt = 0x5 (f s /240 butterworth) 0.0018 x f s dc attenuation dc atten avflt 000 90 db stereo audio mode fir lowpass filter (mode1 = 1, dhf1 = 0, lrclk < 50khz)passband cutoff f plp ripple limit cutoff 0.43 x f s hz -3db cutoff 0.48 x f s -6.02db cutoff 0.5 x f s passband ripple f < f plp -0.1 +0.1 db stopband cutoff f slp 0.58 x f s hz stopband attenuation(note 6) f < f slp 60 db adc stereo audio mode fir lowpass filter (mode1 = 1, dhf1 = 1, lrclk > 50khz)passband cutoff f plp ripple limit cutoff 0.208 x f s hz -3db cutoff 0.28 x f s passband ripple f < f plp -0.1 +0.1 db stopband cutoff f slp 0.417 x f s hz stopband attenuation f < f slp 60 db downloaded from: http:///
________________________________________________________________ maxim integrated products 11 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units adc stereo audio mode dc blocking highpass filter (mode1 = 1)passband cutoff (-3db from peak) f ahppb avflt 000 0.000125 x f s hz dc attenuation dc atten avflt 000 90 db microphone automatic gain controlagc hold duration agchld = 01 50 ms agchld = 11 400 agc attack time agcatk = 00 2 ms agcatk = 11 123 agc release time agcrls = 000 0.078 s agcrls = 111 10 agc threshold level agcth = 0x0 to 0xf -3 +18 db agc threshold step size 1 db agc gain (note 5) 0 20 db adc noise gate ng threshold level anth = 0x3 to 0xf, referred to 0dbfs -64 -16 db ng attenuation (note 5) 0 12 db adc-to-dac digital sidetone (mode = 0)sidetone gain adjust range av stga dvst = 0x01 -0.5 db dvst = 0x1f -60.5 sidetone gain adjust step size 2 db sidetone path phase delay 1khz, 0db input, highpass filter disabled 8khz 2.2 ms 16khz 1.1 adc-to-dac digital loop-through path dynamic range (note 4) dr f s = 48khz, mclk = 12.288mhz, mode = 1 (fir audio), mic to hp output, t a = +25 n c 83 93 db total harmonic distortion + noise thd+n f = 1khz, f s = 48khz, mclk = 12.288mhz, mode = 1 (fir audio), mic to hp output 81 db dac level controldac attenuation range av dacattn dv_ = 0xf to 0x0 (note 5) -15 0 db dac attenuation step size 1 db dac gain adjust range av dacgain dv1g = 00 to 11 (note 5) 0 18 db dac gain adjust step size 6 db downloaded from: http:///
________________________________________________________________ maxim integrated products 12 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units dac digital filtersvoice mode iir lowpass filter (mode1 = 0) passband cutoff f plp ripple limit cutoff 0.448 x f s hz -3db cutoff 0.451 x f s passband ripple f < f plp -0.1 +0.1 db stopband cutoff f slp 0.476 x f s hz stopband attenuation (note 6) f > f slp 75 db voice mode iir highpass filter (mode1 = 0)passband cutoff (-3db from peak) f dhppb dvflt = 0x1 (elliptical tuned for f s = 16khz + 217hz notch) 0.0161 x f s hz dvflt = 0x2 (500hz butterworth tuned for f s = 16khz) 0.0312 x f s dvflt = 0x3 (elliptical tuned for f s = 8khz + 217hz notch) 0.0321 x f s dvflt = 0x4 (500hz butterworth tuned for f s = 8khz) 0.0625 x f s dvflt = 0x5 (fs/240 butterworth) 0.0042 x f s stopband cutoff(-30db from peak) f dhpsb dvflt = 0x1 (elliptical tuned for f s = 16khz + 217hz notch) 0.0139 x f s hz dvflt = 0x2 (500hz butterworth tuned for f s = 16khz) 0.0156 x f s dvflt = 0x3 (elliptical tuned for f s = 8khz + 217hz notch) 0.0279 x f s dvflt = 0x4 (500hz butterworth tuned for f s = 8khz) 0.0312 x f s dvflt = 0x5 (f s /240 butterworth) 0.0021 x f s dc attenuation dc atten dvflt 000 85 db stereo audio mode fir lowpass filter (mode1 = 1, dhf1/dhf2 = 0, lrclk < 50khz)passband cutoff f plp ripple limit cutoff 0.43 x f s hz -3db cutoff 0.47 x f s -6.02db cutoff 0.5 x f s passband ripple f < f plp -0.1 +0.1 db stopband cutoff f slp 0.58 x f s hz stopband attenuation (note 6) f > f slp 60 db downloaded from: http:///
________________________________________________________________ maxim integrated products 13 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units stereo audio mode fir lowpass filter (mode1 = 1, dhf1/dhf2 = 1 for lrclk > 50khz)passband cutoff f plp ripple limit cutoff 0.24 x f s hz -3db cutoff 0.31 x f s passband ripple f < f plp -0.1 +0.1 db stopband cutoff f slp 0.477 x f s hz stopband attenuation(note 6) f < f slp 60 db stereo audio mode dc blocking highpass filterpassband cutoff (-3db from peak) f dhppb dvflt 000 (dai1), dcb2 = 1 (dai2) 0.000104 x f s hz dc attenuation dc atten dvflt 000 (dai1), dcb2 = 1 (dai2) 90 db automatic level controldual band lowpass corner frequency alcmb = 1 5 khz dual band highpass corner frequency alcmb = 1 5 khz gain range 0 12 db low-signal threshold alcth = 111 to 001 -48 -12 dbfs release time alcrls = 101 0.25 s alcrls = 000 8 parametric equalizernumber of bands 5 bands per band gain range -12 +12 db preattenuator gain range (note 5) -15 0 db preattenuator step size 1 db dac to receiver amplifier pathdynamic range dr f s = 48khz, f = 1khz (note 4) 96 db total harmonic distortion + noise thd+n f = 1khz, p out = 15mw, r rec = 32 i -70 -63 db power-supply rejection ratio psrr v spklvdd = 2.8v to 5.5v, t a = +25 n c 64 75 db f = 217hz, v ripple = 200mv p-p -59 f = 1khz, v ripple = 200mv p-p -59 f = 10khz, v ripple = 200mv p-p -59 click-and-pop level k cp peak voltage, a-weighted, 32 samples per second, av rec = 0db into shutdown -68 dbv out of shutdown -72 downloaded from: http:///
________________________________________________________________ maxim integrated products 14 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units line input to receiver amplifier pathdynamic range (note 4) dr referenced to full-scale output level 94 db total harmonic distortion + noise thd+n -64 db click-and-pop level k cp peak voltage, a-weighted, 32 samples per second, av rec = 0db into shutdown -51 dbv out of shutdown -49 receiver amplifieroutput power p out r rec = 32 i , f = 1khz, thd = 1% 83 mw full-scale output (note 7) 1 v rms volume control (note 5) av rec recvol = 0x00 -62 db recvol = 0x1f 8 volume control step size +8db to +6db 0.5 db +6db to +0db 1 0db to -14db 2 -14db to -38db 3 -38db to -62db 4 mute attenuation f = 1khz 88 db capacitive drive capability no sustained oscillations r rec = 32 i 500 pf r rec = j 100 dac to line out amplifier pathdynamic range (note 4) dr f s = 48khz, f = 1khz 83 96 db total harmonic distortion + noise thd+n f = 1khz, r l = 1k i -78 -72 db line input to line out amplifier pathdynamic range (note 4) dr referenced to full-scale output level 92 db total harmonic distortion + noise thd+n f = 1khz, r l = 10k i 76 db full-scale output (note 7) 2 v p-p mute attenuation f = 1khz 85 db output offset voltage v os av rec_ = -62db q 3.0 q 4 mv capacitive drive capability no sustained oscillations, r l = 1k i 500 pf downloaded from: http:///
________________________________________________________________ maxim integrated products 15 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units dac to speaker amplifier pathtotal harmonic distortion + noise thd+n f = 1khz, p out = 200mw, z spk = 8 i + 68 f h -68 db crosstalk spkl to spkr and spkr to spkl,p out = 640mw, f = 1khz -88 db output noise 53 f v rms click-and-pop level k cp peak voltage, a-weighted,32 samples per second, av spk_ = 0db into shutdown 65 dbv out of shutdown 66 mic input to speaker amplifier pathdynamic range (note 4) dr referenced to full-scale output level, av spk_ = 0db 82 db total harmonic distortion + noise thd+n f = 1khz, p out = 200mw, r l = 8 i + 68 f h 71 db click-and-pop level k cp peak voltage, a-weighted, 32 samples per second, av spk_ = 0db into shutdown 55 dbv out of shutdown 52 speaker amplifieroutput power p out f = 1khz, thd = 1%, z spk = 8 i + 68 f h v spklvdd = v spkrvdd = 5.0v 1323 mw v spklvdd = v spkrvdd = 4.2v 914 v spklvdd = v spkrvdd = 3.7v 700 v spklvdd = v spkrvdd = 3.2v 514 full-scale output (note 7) 2 v rms volume control av spk_ (note 5) spvoll/spvolr = 0x00 -62 db spvoll/spvolr = 0x1f +8 volume control step size +8db to +6db 0.5 db +6db to +0db 1 0db to -14db 2 -14db to -38db 3 -38db to -64db 4 mute attenuation f = 1khz 86 db output offset voltage v os av spk_ = -61db, t a = +25 n c q 0.5 q 3 mv downloaded from: http:///
________________________________________________________________ maxim integrated products 16 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units excursion limiterupper corner frequency range dhpucf = 001 to 100 400 1000 hz lower corner frequency dhplcf = 01 to 10 400 hz biquad minimum corner frequency dhpucf = 000 (fixed mode) 100 hz dhpucf = 001 200 dhpucf = 010 300 dhpucf = 011 400 dhpucf = 100 500 threshold voltage z spk = 8 i + 68 f h, v spklvdd = v spkrvdd = 5.5v, av spk_ = 8db dhpth = 000 0.34 v p dhpth = 111 0.95 release time alcrls = 101 0.25 s alcrls = 000 4 power limiterattenuation -64 db threshold z spk = 8 i + 68 f h, v spklvdd = v spkrvdd = 5.5v, av spk_ = 8db pwrth = 0x1 0.08 w pwrth = 0xf 1.23 time constant 1 t pwr1 pwrt1 = 0x1 0.5 s pwrt1 = 0xf 8.7 time constant 2 t pwr2 pwrt2 = 0x1 to 0xf 0.5 min pwrt2 = 0xf 8.7 weighting factor k pwr pwrk = 000 to 111 12.5 100 % distortion limiter distortion limit thdclp = 0x1 < 1 % thdclp = 0xf 24 release time constant thdt1 = 000 0.76 s thdt1 = 111 6.2 downloaded from: http:///
________________________________________________________________ maxim integrated products 17 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units dac to headphone amplifier pathdynamic range (note 4) dr f s = 48khz master or slave mode 101 db slave mode 97 low power mode, t a = +25 n c 95 97 total harmonic distortion + noise thd+n f = 1khz, p out = 20mw r hp = 16 i -85 -64 db r hp = 32 i -92 crosstalk hpl to hpr and hpr to hpl, p out = 5mw, f = 1khz, r hp = 32 i 79.5 db power-supply rejection ratio psrr v avdd = v pvdd = 1.65v to 2.0v 46 54 db f = 217hz, v ripple = 200mv p-p , av hp_ = 0db 72 f = 1khz, v ripple = 200mv p-p , av hp_ = 0db 63 f = 10khz, v ripple = 200mv p-p , av hp_ = 0db 43 dac path phase delay 1khz, 0db input, highpass filter disabled measured from digital input to analog output mode = 0 (voice) 8khz 2.2 ms mode = 0 (voice) 16khz 1.1 mode = 1 (music) 8khz 4.5 mode = 1 (music) 48khz 0.76 gain error 1 5 % channel gain mismatch 1 % click-and-pop level k cp peak voltage, a-weighted,32 samples per second, av hp_ = 0db into shutdown -62 dbv out of shutdown -63 line input to headphone amplifier path total harmonic distortion + noise thd+n v in = 1v p-p , f =1khz, r hp = 32 i 81 db dynamic range (note 4) 92.5 db click-and-pop level k cp peak voltage, a-weighted,32 samples per second, av hp_ = 0db into shutdown -62 dbv out of shutdown -63 downloaded from: http:///
________________________________________________________________ maxim integrated products 18 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) parameter symbol conditions min typ max units headphone amplifieroutput power p out f = 1khz, thd = 1% r hp = 32 i 30 mw r hp = 16 i 38 positive charge-pump output voltage hpvdd v out v pvdd x 0.25v, r hp = j pvdd/2 v v out > v pvdd x 0.25v, r hp = j pvdd negative charge-pump output voltage hpvss v out v pvdd x 0.25v, r hp = j -pvdd/2 v v out > v pvdd x 0.25v, r hp = j -pvdd output voltage threshold (output voltage at which the charge pump switches modes; vout rising; transition from split to invert mode) v th rl = j q pvdd x 0.25 v full-scale output (note 7) 1 v rms volume control av hp_ (note 5) hpvol_ = 0x00 -67 db hpvol_ = 0x1f +3 volume control step size +3db to +1db 0.5 db +1db to -5db 1 -5db to -19db 2 -19db to -43db 3 -43db to -67db 4 mute attenuation f = 1khz 100 db output offset voltage v os av hp_ = -67db t a = +25 n c q 0.5 q 1 mv t a = t min to t max q 3 capacitive drive capability no sustained oscillations r hp = 32 i 500 pf r hp = j 100 speaker bypass switch on-resistance r on i spkl_ = 100ma, spkbyp = 1, v rxin_ = [0v, v spklvdd ] 2.8 i total harmonic distortion + noise thd+n v in = 2v p-p , v cm = v spklvdd /2, z spk = 8 i + 68 f h, f = 1khz, spkbyp = 1 r s = 10 i 60 db r s = 0 i 60 off-isolation v in = 2v p-p , v cm = v spklvdd /2, z spk = 8 i + 68 f h, f = 1khz 96 db off-leakage current v rxin_ = [0v, v spklvdd ], v spkl_ = [v spklvdd , 0v] -20 +20 f a downloaded from: http:///
________________________________________________________________ maxim integrated products 19 MAX98088 stereo audio codec with flexsound technology electrical characteristics (continued)(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. line out loads (r load ) connected from loutl or loutr to spklgnd. r load = r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = t min to t max , unless otherwise noted. typical values are at +25 n c.) (note 1) digital input/output characteristics(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v, t a = +25 n c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units mclkinput high voltage v ih 1.2 v input low voltage v il 0.6 v input leakage current i ih , i il v dvdd = 2.0v, v in = 0v, 5.5v; t a = +25 c -1 +1 f a input capacitance 10 pf sdins1, bclks1, lrclks1?inputinput high voltage v ih 0.7 x dvdds1 v input low voltage v il 0.29 x dvdds1 v input hysteresis 200 mv input leakage current i ih , i il v dvdds1 = 3.6v, v in = 0v, 3.6v; t a = +25 c -1 +1 f a input capacitance 10 pf parameter symbol conditions min typ max units receiver bypass switch on-resistance r on i recp = 100ma, recbyp = 1, v recn = [0v, v spklvdd ] 2 i total harmonic distortion + noise thd+n v in = 2v p-p , v cm = v spklvdd /2, z spk = 8 i + 68 f h, f = 1khz, recbyp = 1, r s = 0 i 60 db off-isolation v in = 2v p-p , v cm = v spklvdd /2, z spk = 8 i + 68 f h, f = 1khz 84 db off-leakage current v recp = [0v, v spklvdd ], v recn = [v spklvdd , 0v] -15 +15 f a jack detectionjacksns threshold shdn = 1, jacksns rising 0.92 x v micbias 0.95 x v micbias 0.98 x v micbias v shdn = 0, jksns spklvdd - 0.7 jacksns sense voltage shdn = 0 spklvdd v jacksns sense current v jacksns = 0v 4 10 f a battery adcinput voltage range 2.6 5.6 v lsb size 0.1 v downloaded from: http:///
________________________________________________________________ maxim integrated products 20 MAX98088 stereo audio codec with flexsound technology digital input/output characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v, t a = +25 n c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units bclks1, lrclks1, sdouts1?outputoutput low voltage v ol v dvdds1 = 1.65v, i ol = 3ma 0.4 v output high voltage v oh v dvdds1 = 1.65v, i oh = 3ma dvdds1 - 0.4 v input leakage current i ih , i il v dvdd = 2.0v, v in = 0v, 5.5v; t a = +25 c, high-impedance state -1 +1 f a sdins2, bclks2, lrclks2?inputinput high voltage v ih 0.7 x dvdds2 v input low voltage v il 0.29 x dvdds2 v input hysteresis 200 mv input leakage current i ih , i il v dvdds2 = 3.6v, v in = 0v, 3.6v; t a = +25 c -1 +1 f a input capacitance 10 pf bclks2, lrclks2, sdouts2?outputoutput low voltage v ol v dvdds2 = 1.65v, i ol = 3ma 0.4 v output high voltage v oh v dvdds2 = 1.65v, i oh = 3ma dvdds2 - 0.4 v input leakage current i ih , i il v dvdd = 2.0v, v in = 0v, 5.5v; t a = +25 n c, high-impedance state -1 +1 f a sda, scl?inputinput high voltage v ih 0.7 x dvdd v input low voltage v il 0.3 x dvdd v input hysteresis 210 mv input leakage current i ih , i il v dvdd = 2.0v, v in = 0v, 5.5v; t a = +25 n c -1 +1 f a input capacitance 10 pf sda, irq ?output output high current i oh v out = 5.5v, t a = +25 c 1 ma output low voltage v ol v dvdd = 1.65v, i ol = 3ma 0.2 x dvdd v digmicdata?inputinput high voltage v ih 0.65 x dvdd v input low voltage v il 0.35 x dvdd v input hysteresis 125 mv input leakage current i ih , i il v dvdd = 2.0v, v in = 0v, 2.0v; t a = +25 c -25 +25 f a input capacitance 10 pf downloaded from: http:///
________________________________________________________________ maxim integrated products 21 MAX98088 stereo audio codec with flexsound technology digital input/output characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v, t a = +25 n c, unless otherwise noted.) (note 1)input clock characteristics (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v, t a = +25 n c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units mclk input frequency f mclk 10 60 mhz mclk input duty cycle psclk = 01 40 50 60 % psclk = 10 or 11 30 70 maximum mclk input jitter 100 ps rms lrclk sample rate (note 8) dhf_ = 0 8 48 khz dhf_ = 1 48 96 dai1 lrclk average frequency error (note 9) freq1 = 0x8 to 0xf 0 0 % freq1 = 0x0 -0.025 +0.025 dai2 lrclk average frequency error (note 9) -0.025 +0.025 % pll lock time rapid lock mode 2 7 ms nonrapid lock mode 12 25 maximum lrclk jitter to maintain pll lock 100 ns soft-start/stop time 10 ms parameter symbol conditions min typ max units digmicclk?outputoutput low voltage v ol v dvdd = 1.65v, i ol = 1ma 0.4 v output high voltage v oh v dvdd = 1.65v, i oh = 1ma dvdd - 0.4 v downloaded from: http:///
________________________________________________________________ maxim integrated products 22 MAX98088 stereo audio codec with flexsound technology audio interface timing characteristics(v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v, t a = +25 n c, unless otherwise noted.) (note 1)figure 1. non-tdm audio interface timing diagrams (tdm_ = 0) parameter symbol conditions min typ max units bclk cycle time t bclk slave mode 90 ns bclk high time t bclkh slave mode 20 ns bclk low time t bclkl slave mode 20 ns bclk or lrclk rise and fall time t r , t f master mode, c l = 15pf 5 ns sdin to bclk setup time t setup 20 ns lrclk to bclk setup time t syncset slave mode 20 ns sdin to bclk hold time t hold 20 ns lrclk to bclk hold time t synchold slave mode 20 ns minimum delay time from lsb bclk falling edge to high-impedance state t hizout master mode, tdm_ = 1 42 ns lrclk rising edge to sdout msb delay t synctx c l = 30pf, tdm_ = 1, fsw_ = 1 50 ns bclk to sdout delay t clktx c l = 30pf tdm_ = 1, bclk rising edge 50 ns tdm_ = 0 50 delay time from bclk to lrclk t clksync master mode tdm_ = 1 -15 +15 ns tdm_ = 0 0.8 x t bclkl delay time from lrclk to bclk after lsb t endsync master mode tdm_ = 1, fsw_ = 1 20 ns t r t clktx t setup t hold t bclk t bclkh t bclkl msb lsb lsb bclk (output) lrclk (output) sdout (output) sdin (input) bclk (input) lrclk (input) sdout (output) sdin (input) master mode t setup t hold msb msb lsb lsb hi-z slave mode hi-z msb t clksync t f t hizout t clktx t syncset t hizout downloaded from: http:///
________________________________________________________________ maxim integrated products 23 MAX98088 stereo audio codec with flexsound technology figure 2. tdm audio interface timing diagram (tdm_ = 1, fsw_ = 0)figure 3. tdm audio interface timing diagram (tdm_ = 1, fsw_ = 1) digital microphone timing characterstics (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v, t a = +25 n c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units digmicclk frequency f micclk micclk = 00 mclk/8 mhz micclk = 01 mclk/6 digmicdata to digmicclksetup time t su,mic either clock edge 20 ns digmicdata to digmicclkhold time t hd,mic either clock edge 0 ns lrclk (output) bclk (output) sdout (output) sdin (input) t clktx t hizout hi-z lsb t hold t setup lsb msb msb t clksync t r t f lrclk (input) bclk (input) sdout (output) sdin (input) t clktx t hizout hi-z lsb t hold t setup lsb t synchold msb msb t bclkh t bclkl t bclk t syncset master mode slave mode t clksync t bclkh t bclkl t clksync t r t f l rc lk (output) bclk (output) sdo ut (output) s din (input) mast er mode hi- z lsb ms b t synctx t e nds yn c lsb ms b slave mo de hi- z lsb lsb ms b ms b t clktx t hizout t hold t setup t hold t setup lrclk (input) bclk (input) sdout (output) sdin (input) t bclk t synctx t clktx t hizout downloaded from: http:///
________________________________________________________________ maxim integrated products 24 MAX98088 stereo audio codec with flexsound technology figure 4. digital microphone timing diagrami 2 c timing characterstics (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v, t a = +25 n c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units serial-clock frequency f scl guaranteed by scl pulse-width low and high 0 400 khz bus free time between stop and start conditions t buf 1.3 f s hold time (repeated) start condition t hd,sta 0.6 f s scl pulse-width low t low 1.3 f s scl pulse-width high t high 0.6 f s setup time for a repeated start condition t su,sta 0.6 f s data hold time t hd,dat r pu = 475 i , cb = 100pf, 400pf 0 900 ns data setup time t su,dat 100 ns sda and scl receiving rise time t r (note 10) 20 + 0.1c b 300 ns sda and scl receiving fall time t f (note 10) 20 + 0.1c b 300 ns sda transmitting fall time t f r pu = 475 i , c b = 100pf, 400pf (note 10) 20 + 0.05c b 250 ns setup time for stop condition t su,sto 0.6 f s bus capacitance c b guaranteed by sda transmitting fall time 400 pf pulse width of suppressed spike t sp 0 50 ns 1/f mi cc lk t hd,mic t su,mic t hd,mic t su,mic le ft r igh tl ef tr ig ht downloaded from: http:///
________________________________________________________________ maxim integrated products 25 MAX98088 stereo audio codec with flexsound technology figure 5. i 2 c interface timing diagram i 2 c timing characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. t a = +25 n c, unless otherwise noted.) (note 1) note 1: the ic is 100% production tested at t a = +25 n c. specifications over temperature limits are guaranteed by design. note 2: analog supply current = i avdd + i hpvdd . speaker supply current = i spklvdd + i spkrvdd . digital supply current = i dvdd + i dvdds1 + i dvdds2 . note 3: clocking all zeros into the dac. note 4: dynamic range measured using the eiaj method. -60dbfs, 1khz output signal, a-weighted and normalized to 0dbfs. f = 20hz to 20khz. note 5: gain measured relative to the 0db setting. note 6: the filter specification is accurate only for synchronous clocking modes, where ni is a multiple of 0x1000. note 7: 0dbfs for dac input. 1v p-p for ina/inb inputs. note 8: lrclk may be any rate in the indicated range. asynchronous or noninteger mclk/lrclk ratios may exhibit some full- scale performance degradation compared to synchronous integer related mclk/lrclk ratios. note 9: in master-mode operation, the accuracy of the mclk input proportionally determines the accuracy of the sample clock rate. note 10: cb is in pf. power consumption (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = 1.8v, v spklvdd = v spkrvdd = 3.7v) mode i avdd (ma) i pvdd (ma) i spkvdd + i spklvdd (ma) i dvdd (ma) i dvdds1 + i dvdds2 (ma) power (mw) dynamic range (db) playback to headphone onlydac playback 48khz stereo hp dac a hp low power mode, 24-bit, music fil - ters, 256fs 1.25 0.47 0.00 1.35 0.01 5.55 97 dac playback 48khz stereo hpdac a hp low power mode, 24-bit, music fil - ters, 256fs, 0.1mw/channel,r hp = 32 i 1.25 1.81 0.00 1.56 0.01 8.32 97 scl sda t r t f t buf start condition stop condition repeated start condition start condition t su,sto t hd,sta t su,sta t hd,dat t su,dat t low t high t hd,sta t sp downloaded from: http:///
________________________________________________________________ maxim integrated products 26 MAX98088 stereo audio codec with flexsound technology power consumption (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = 1.8v, v spklvdd = v spkrvdd = 3.7v) mode i avdd (ma) i pvdd (ma) i spkvdd + i spklvdd (ma) i dvdd (ma) i dvdds1 + i dvdds2 (ma) power (mw) dynamic range (db) dac playback 48khz stereo hpdac a hp 24-bit, music filters, 256fs 2.04 1.27 0.00 1.53 0.01 8.72 101 dac playback 48khz stereo hpdac a hp 24-bit, music filters, 256fs, 0.1mw/channel, r hp = 32 i 2.04 2.11 0.00 1.74 0.01 10.63 101 dac playback 44.1khz stereo hpdac a hp 24-bit, music filters 2.03 1.27 0.00 1.41 0.01 8.46 100 dac playback 44.1khz stereo hpdac a hp low power mode, 24-bit, music filters 1.25 0.47 0.00 1.25 0.01 5.34 97 dac playback 8khz stereo hpdac a hp 16-bit, voice filters 2.04 1.27 0.00 1.07 0.00 7.89 95 dac playback 8khz stereo hpdac a hp 16-bit, low power mode, voice filters 1.26 0.47 0.00 0.90 0.00 4.72 94 dac playback 8khz mono hpdac a hp 16-bit, low power mode, voice filters 0.77 0.29 0.00 0.79 0.00 3.33 93.7 line playback stereo hpina a hp single-ended inputs 2.40 1.27 0.00 0.02 0.00 6.67 95 dac playback to class d speakerdac playback 48khz stereo spk dac a spk 24-bit, music filters 2.31 0.00 6.33 2.14 0.01 31.44 86 downloaded from: http:///
________________________________________________________________ maxim integrated products 27 MAX98088 stereo audio codec with flexsound technology power consumption (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = 1.8v, v spklvdd = v spkrvdd = 3.7v) mode i avdd (ma) i pvdd (ma) i spkvdd + i spklvdd (ma) i dvdd (ma) i dvdds1 + i dvdds2 (ma) power (mw) dynamic range (db) dac playback 48khz mono spkdac a spk 24-bit, music filters 1.35 0.00 3.23 1.84 0.01 17.69 86 line playback mono spkina a spkl differential inputs 1.01 0.00 3.24 0.03 0.00 13.83 83 full duplexfull-duplex 8khz mono rcv mic1 a adc dac a rec 16-bit, voice filters 6.32 0.00 1.54 1.24 0.01 19.33 record = 87 playback = 94 full-duplex 8khz stereo hpmic1/2 a adc dac a hp 16-bit, mixer, voice filters 11.19 1.27 0.48 1.28 0.01 26.43 record = 87 playback = 96 full-duplex 8khz stereo hpmic1/2 a adc dac a hp 16-bit, low power mode, voice filters 7.12 0.47 0.48 1.10 0.02 17.44 record = 87 playback = 94 line recordline stereo record 48khz ina a adc 24-bit, low power, music filters 6.19 0.00 0.20 1.31 0.15 14.47 91 line stereo record 48khzina a adc direct pin input, 24bit, low power, music filters 5.69 0.00 0.20 1.31 0.12 13.53 93 downloaded from: http:///
________________________________________________________________ maxim integrated products 28 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) microphone to adc total harmonic distortion plusnoise vs. frequency (mic to adc) MAX98088 toc01 frequency (hz) thd+n ratio (db) 1000 100 10 10,000 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 mclk = 13mhzlrclk = 8khz freq mode v in = 1v p-p av micpre_ = 0db total harmonic distortion plusnoise vs. frequency (mic to adc) MAX98088 toc02 frequency (hz) 10,000 1000 100 0 10 100,000 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 mclk = 13mhzlrclk = 44.1khz pll mode v in = 1v p-p av micpre_ = 0db total harmonic distortion plusnoise vs. frequency (mic to adc) MAX98088 toc03 frequency (hz) 10,000 1000 100 0 10 100,000 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 -100 mclk = 12.288mhzlrclk = 48khz ni mode v in = 1v p-p av micpre_ = 0db total harmonic distortion plusnoise vs. frequency (mic to adc) MAX98088 toc04 frequency (hz) 10,000 1000 100 0 10 100,000 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 -100 mclk = 12.288mhzlrclk = 96khz ni mode v in = 1v p-p av micpre_ = 0db total harmonic distortion plusnoise vs. frequency (mic to adc) MAX98088 toc05 frequency (hz) thd+n ratio (db) 1000 100 10 10,000 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 mclk = 13mhzlrclk = 8khz freq mode v in = 0.1v p-p av micpre_ = 0db total harmonic distortion plusnoise vs. frequency (mic to adc) MAX98088 toc06 frequency (hz) thd+n ratio (db) 1000 100 10 10,000 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 mclk = 13mhzlrclk = 8khz freq mode v in = 0.032v p-p av micpre_ = 0db downloaded from: http:///
________________________________________________________________ maxim integrated products 29 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) gain vs. frequency (mic to adc) MAX98088 toc07 frequency (hz) normalized gain (db) 1000 100 10 10k 0 10 mclk = 13mhzlrclk = 8khz freq mode v in = 1v p-p av micpre_ = 0db mode = 1 mode = 0 -90 -80 -70 -60 -50 -40 -30 -20 -10 common-mode rejection ratio vs. frequency (mic to adc) MAX98088 toc08 frequency (hz) cmrr (db) 10,000 1000 100 10 20 30 40 50 60 70 0 10 100,000 mclk = 12.288mhz lrclk = 48khz freq mode micpre = 30db micpre = 20db micpre = 0db power-supply rection ratio vs. frequency (mic to adc) MAX98088 toc09 frequency (hz) psrr (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 10 -90 10 100,000 inputs ac grounded v ripple = 200mv p-p ripple on spklvdd, spkrvdd ripple on avdd, dvdd, hpvdd fft, 0dbfs (mic to adc) MAX98088 toc10 frequency (hz) amplitude (dbfs) 3500 3000 2000 2500 1000 1500 500 -160 -140 -120 -100 -80 -60 -40 -20 0 20 -180 0 4000 mclk = 13mhz lrclk = 8khz freq mode av micpre_ = 0db fft, -60dbfs (mic to adc) MAX98088 toc11 -160 -140 -120 -100 -80 -60 -40 -20 0 -180 frequency (hz) 3500 3000 2000 2500 1000 1500 500 0 4000 amplitude (dbfs) mclk = 13mhz lrclk = 8khz freq mode av micpre_ = 0db fft, 0dbfs (mic to adc) MAX98088 toc12 frequency (hz) amplitude (dbfs) 15,000 10,000 5000 -120 -100 -80 -60 -40 -20 0 20 -140 0 20,000 mclk = 13mhz lrclk = 44.1khz pll mode av micpre_ = 0db downloaded from: http:///
________________________________________________________________ maxim integrated products 30 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) fft, -60dbfs (mic to adc) MAX98088 toc13 amplitude (dbfs) -120 -100 -80 -60 -40 -20 0 -140 mclk = 13mhz lrclk = 44.1khz pll mode av micpre_ = 0db frequency (khz) 15 10 5 02 0 fft, 0dbfs (mic to adc) MAX98088 toc14 frequency (khz) amplitude (dbfs) 15 1 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 12.288mhz lrclk = 48khz ni mode av micpre_ = 0db fft, -60dbfs (mic to adc) MAX98088 toc15 amplitude (dbfs) -120 -100 -80 -60 -40 -20 0 -140 mclk = 12.288mhz lrclk = 48khz ni mode av micpre_ = 0db frequency (khz) 15 10 5 02 0 fft, 0dbfs (mic to adc) MAX98088 toc16 frequency (khz) amplitude (dbfs) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 12.288mhz lrclk = 96khz ni mode av micpre_ = 0db downloaded from: http:///
________________________________________________________________ maxim integrated products 31 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) fft, -60dbfs (mic to adc) MAX98088 toc17 amplitude (dbfs) -120 -100 -80 -60 -40 -20 0 -140 mclk = 12.288mhz lrclk = 96khz ni mode av micpre_ = 0db frequency (khz) 15 10 5 02 0 software turn-on/off response (mic to adc) MAX98088 toc19 scl1v/div adc output 0.5v/div 10ms/div adc enable/disable response (mic to adc) MAX98088 toc18 scl1v/div adc output 0.5v/div 10ms/div downloaded from: http:///
________________________________________________________________ maxim integrated products 32 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) line to adc total harmonic distortion plus noise vs. frequency (line to adc) MAX98088 toc20 frequency (hz) thd+n ratio (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 mclk = 12.288mhz lrclk = 48khz ni mode v in = 1.4v p-p av pgain_ = -6db c in = 1f total harmonic distortion plus noise vs. frequency (line to adc) MAX98088 toc21 frequency (hz) thd+n ratio (db) 10,000 1000 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100,000 mclk = 12.288mhz lrclk = 48khz ni mode v in = 1v p-p av pgain_ = 0db c in = 1f total harmonic distortion plus noise vs. frequency (line to adc) MAX98088 toc22 frequency (hz) thd+n ratio (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 mclk = 12.288mhz lrclk = 48khz ni mode v in = 0.1v p-p av pgain_ = +20db c in = 1f total harmonic distortion plus noise vs. frequency (line-in to adc) MAX98088 toc23 frequency (hz) thd+n (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 mclk = 12.288mhz lrclk = 48khz v in = 1v rms external gain mode r in = 56k i c in = 1f power-supply rejection ratio vs. frequency (line-in to adc) MAX98088 toc24 frequency (hz) psrr (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 10 -90 10 100,000 v ripple = 200mv p-p ripple on spklvdd, spkrvdd ripple on avdd, dvdd, hpvdd downloaded from: http:///
________________________________________________________________ maxim integrated products 33 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) digital loopback line-in pin direct to adc fft, 0dbfs (sdins1 to sdins2 digital loopback) MAX98088 toc27 frequency (khz) amplitude (dbfs) 15 10 5 -160 -140 -120 -100 -80 -60 -40 -20 0 -180 02 0 mclk = 12.288mhz lrclk = 48khz ni mode total harmonic distortion plus noise vs. frequency (line-in direct to adc) MAX98088 toc25 frequency (hz) thd+n ratio (db) 10,000 1000 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100,000 mclk = 12.288mhz lrclk = 48khz ni mode v in = 1v p-p c in = 1f fft, -60dbfs (sdins1 to sdins2 digital loopback) MAX98088 toc28 frequency (khz) amplitude (dbfs) 15 10 5 -160 -140 -120 -100 -80 -60 -40 -20 0 -180 02 0 mclk = 12.288mhz lrclk = 48khz ni mode power-supply rejection ratio vs. frequency (line-in direct to adc) MAX98088 toc26 frequency (hz) psrr (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 v ripple = 200mv p-p ripple on spklvdd, spkrvdd ripple on avdd, dvdd, hpvdd downloaded from: http:///
________________________________________________________________ maxim integrated products 34 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) analog loopback total harmonic distortion plus noise vs. frequency (line to adc to dac to headphone) MAX98088 toc29 frequency (hz) 10,000 1000 100 0 10 100,000 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 mclk = 13mhzlrclk = 44.1khz pll mode r hp = 32 i c in = 1f p out = 0.020w p out = 0.01w total harmonic distortion plus noise vs. frequency (line to adc to dac to headphone) MAX98088 toc30 -70 -60 -50 -40 -30 -20 -10 0 -80 frequency (hz) 10,000 1000 100 10 100,000 thd+n ratio (db) p out = 0.020w p out = 0.01w mclk = 12.288mhzlrclk = 48khz ni mode r hp = 32 i c in = 1f fft, 0dbfs (line to adc to dac to headphone) MAX98088 toc31 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 13mhz lrclk = 44.1khz pll mode r hp = 32 i c in = 1f fft, -60dbfs (line to adc to dac to headphone) MAX98088 toc32 amplitude (dbv) -120 -100 -80 -60 -40 -20 0 -140 frequency (khz) 15 10 5 02 0 mclk = 13mhz lrclk = 44.1khz pll mode r hp = 32 i c in = 1f fft, 0dbfs (line to adc to dac to headphone) MAX98088 toc33 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 12.288mhz lrclk = 48khz ni mode r hp = 32 i c in = 1f fft, -60dbfs (line to adc to dac to headphone) MAX98088 toc34 amplitude (dbv) -120 -100 -80 -60 -40 -20 0 -140 frequency (khz) 15 10 5 02 0 mclk = 12.288mhz lrclk = 48khz ni mode r hp = 32 i c in = 1f downloaded from: http:///
________________________________________________________________ maxim integrated products 35 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) dac to receiver total harmonic distortion plus noise vs. output power (dac to receiver) MAX98088 toc35 output power (w) thd+n (db) 0.10 0.08 0.06 0.04 0.02 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 0.12 mclk = 13mhzlrclk = 8khz freq mode r rec = 32 i av rec = +8db f = 3000hz f = 1000hz f = 100hz total harmonic distortion plus noise vs. frequency (dac to receiver) MAX98088 toc36 frequency (hz) thd+n (db) 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 10,000 mclk = 13mhzlrclk = 8khz freq mode r rec = 32 i av rec = +8db p out = 0.02w p out = 0.08w output power vs. supply voltage (dac to receiver) MAX98088 toc37 supply voltage (v) output power per channel (mw) 5.0 4.5 4.0 3.5 3.0 80 100 120 140 160 180 200 60 2.5 5.5 mclk = 13mhzlrclk = 8khz freq mode r rec = 32 i av rec = +8db thd+n = 10% thd+n = 1% gain vs. frequency (dac to receiver) MAX98088 toc38 normalized gain (db) -4 -3 -2 -1 0 1 2 3 4 5 -5 frequency (hz) 10,000 1000 100 10 mclk = 13mhzlrclk = 8khz freq mode r rec = 32 i power consumption vs. output power (dac to receiver) MAX98088 toc39 output power per channel (mw) power consumption (mw) 100 80 60 40 20 50 100 150 200 250 0 0 120 mclk = 13mhzlrclk = 8khz freq mode av rec = +8db r rec = 32 i power-supply rejection ratio vs. frequency (dac to receiver) MAX98088 toc40 frequency (hz) psrr (db) 10,000 1000 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100,000 inputs ac grounded v ripple = 200mv p-p ripple on spklvdd, spkrvdd ripple on avdd, dvdd, hpvdd downloaded from: http:///
________________________________________________________________ maxim integrated products 36 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) software turn-on/off response (dac to receiver, vsen = 0) MAX98088 toc41 scl1v/div receiver output 1v/div 10ms/div software turn-on/off response (dac to receiver, vsen = 1) MAX98088 toc42 scl1v/div receiver output 1v/div 10ms/div fft, 0dbfs (dac to receiver) amplitude (dbv) -140 -120 -100 -80 -60 -40 -20 0 20 -160 max16067 toc43 mclk = 13mhz lrclk = 8khz freq mode r rec = 32 i frequency (khz) 15 10 5 02 0 fft, -60dbfs (dac to receiver) MAX98088 toc44 amplitude (dbv) -120 -100 -80 -60 -40 -20 0 -140 frequency (khz) 15 10 5 02 0 mclk = 13mhz lrclk = 8khz freq mode r rec = 32 i wideband fft, 0dbfs (dac to receiver) MAX98088 toc45 frequency (khz) amplitude (dbm) 1000 100 10 1 -100 -80 -60 -40 -20 0 -120 0 10,000 mclk = 13mhz lrclk = 8khz freq mode r rec = 32 i wideband fft, 0dbfs (dac to receiver) MAX98088 toc46 frequency (khz) amplitude (dbm) 1000 100 10 1 -100 -80 -60 -40 -20 0 -120 0 10,000 mclk = 13mhz lrclk = 8khz freq mode r rec = 32 i downloaded from: http:///
________________________________________________________________ maxim integrated products 37 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) line to receiver total harmonic distortion plus noise vs. output power (line to receiver) MAX98088 toc47 output power (w) thd+n ratio (db) 0.08 0.06 0.04 0.02 -60 -50 -40 -30 -20 -10 0 -70 0 0.10 r rec = 32 i av rec = +8db c in = 1f f = 6000hz f = 1000hz f = 100hz total harmonic distortion plus noise vs. frequency (line to receiver) MAX98088 toc48 frequency (hz) thd+n ratio (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 r rec = 32 i av rec = +8db c in = 1f p out = 0.02w p out = 0.08w gain vs. frequency (line to receiver) MAX98088 toc49 frequency (hz) 10,000 1000 100 5 10 100,000 normalized gain (db) -4 -3 -2 -1 0 1 2 3 4 -5 r rec = 32 i c in = 1f power-supply rejection ratio vs. frequency (line-in direct to receiver) MAX98088 toc50 frequency (hz) psrr (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 inputs ac grounded v ripple = 200mv p-p ripple on avdd, dvdd, hpvdd ripple on spklvdd, spkrvdd downloaded from: http:///
________________________________________________________________ maxim integrated products 38 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) dac to line outputline to line output fft, 0dbfs (dac to line out) MAX98088 toc51 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 13mhz lrclk = 8khz freq mode r load = 10k i total harmonic distortion plus noise vs. output level (line-in to line-out) MAX98088 toc53 output level (v rms ) thd+n (db) 1.2 1.0 0.6 0.8 0.4 0.2 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 1.4 r load = 10k i f = 6khz f = 1khz f = 100hz fft, -60dbfs (dac to line out) MAX98088 toc52 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 -140 02 0 mclk = 13mhz lrclk = 8khz freq mode r load = 10k i total harmonic distortion plus noise vs. frequency (line-in to line-out) MAX98088 toc54 thd+n (db) -80 -70 -60 -50 -40 -30 -20 -10 0 -90 frequency (hz) 10,000 1000 100 10 100,000 v out = 0.2v rms v out = 0.8v rms r load = 10k i total harmonic distortion plus noise vs. frequency (line-in to line-out) MAX98088 toc55 frequency (hz) thd+n (db) 10,000 1000 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100,000 v in = 1v rms , 1khz r load = 10k i external gain mode r ext = 56k i downloaded from: http:///
________________________________________________________________ maxim integrated products 39 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) dac to speaker total harmonic distortion plus noise vs. output power (dac to speaker) MAX98088 toc56 output power (w) thd+n ratio (db) -80 -70 -60 -50 -40 -30 -20 -10 0 -90 1.4 1.2 1.0 0.6 0.8 0.4 0.2 0 v spkvdd_ = 4.2v mclk = 12.288mhzlrclk = 48khz ni mode z spk_ = 8 i + 68h av spk_ = +8db f = 6000hz f = 1000hz f = 100hz output power (w) 0.8 0.6 0.4 0.2 0 1.0 total harmonic distortion plus noise vs. output power (dac to speaker) MAX98088 toc57 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 v spk_vdd = 3.7v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 8 i + 68h av spk_ = +8db f = 6000hz f = 1000hz f = 100hz 0 total harmonic distortion plus noise vs. output power (dac to speaker) MAX98088 toc58 frequency (hz) normalized gain (dbra) 10k 100 1k -4 -3 -2 -1 0 1 2 3 4 5 -5 10 100k mclk = 12.288mhzlrclk = 48khz ni mode z spk_ = 8 i + 68h output power (w) 2.0 1.5 1.0 0.5 0 2.5 total harmonic distortion plus noise vs. output power (dac to speaker) MAX98088 toc59 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 v spk_vdd = 4.2v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 4 i + 33h av spk_ = +8db f = 6000hz f = 1000hz f = 100hz 0 total harmonic distortion plus noise vs. output power (dac to speaker) MAX98088 toc60 output power (w) thd+n ratio (db) 1.5 1.0 0.5 -70 -60 -50 -40 -30 -20 -10 0 -80 0 2.0 v spk_vdd = 3.7v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 4 i + 33h av spk_ = +8db f = 1000hz f = 100hz f = 6000hz downloaded from: http:///
________________________________________________________________ maxim integrated products 40 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) total harmonic distortion plus noise vs. output power (dac to speaker) MAX98088 toc61 output power (w) thd+n ratio (db) 1.0 0.8 0.6 0.4 0.2 -60 -50 -40 -30 -20 -10 0 -70 0 1.2 v spk_vdd = 3v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 4 i + 33h av spk_ = +8db f = 1000hz f = 100hz f = 6000hz total harmonic distortion plus noise vs. frequency (dac to speaker) MAX98088 toc62 thd+n ratio (db) -70 -60 -50 -40 -30 -20 -10 0 -80 frequency (hz) 2000 200 20 20,000 v spk_vdd = 4.2v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 8 i + 68h av spk_ = +8db p out = 0.25w p out = 0.55w total harmonic distortion plus noise vs. frequency (dac to speaker) MAX98088 toc63 thd+n ratio (db) -70 -60 -50 -40 -30 -20 -10 0 -80 frequency (hz) 2000 200 20 20,000 v spk_vdd = 3.7v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 8 i + 68h av spk_ = +8db p out = 0.25w p out = 0.55w total harmonic distortion plus noise vs. frequency (dac to speaker) MAX98088 toc64 thd+n ratio (db) -70 -60 -50 -40 -30 -20 -10 0 -90 -80 frequency (hz) 10,000 1000 100 100,000 v spk_vdd = 4.2v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 4 i + 33h av spk_ = +8db p out = 0.5w p out = 1w total harmonic distortion plus noise vs. frequency (dac to speaker) MAX98088 toc65 thd+n ratio (db) -70 -60 -50 -40 -30 -20 -10 0 -90 -80 frequency (hz) 10,000 1000 100 100,000 v spk_vdd = 3.7v mclk = 12.288mhzlrclk = 48khz ni mode z sp_ = 4 i + 33h av spk_ = +8db p out = 0.5w p out = 1w output power vs. supply voltage (dac to speaker) MAX98088 toc66 supply voltage (v) output power per channel (mw) 5.0 4.5 4.0 3.5 3.0 600 800 1000 1200 1400 1600 1800 2000 2200 400 2.5 5.5 mclk = 12.288mhzlrclk = 48khz ni mode z spk_ = 8 i + 68h av spk_ = +8db thd+n = 10% thd+n = 1% downloaded from: http:///
________________________________________________________________ maxim integrated products 41 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) output power vs. supply voltage (dac to speaker) MAX98088 toc67 supply voltage (v) output power per channel (mw) 5.0 4.5 3.0 3.5 4.0 500 1000 1500 2000 2500 3000 3500 4000 0 2.5 5.5 mclk = 12.288mhzlrclk = 48khz ni mode z spk_ = 4 i + 33h av spk_ = +8db thd+n = 1% thd+n = 10% gain vs. frequency (dac to speaker) MAX98088 toc68 frequency (hz) normalized gain (db) 10k 1k 100 10 100k -4 -3 -2 -1 0 1 2 3 4 5 -5 mclk = 12.288mhzlrclk = 48khz ni mode z spk_ = 8 i + 68h efficiency vs. output power (dac to speaker) MAX98088 toc69 output power (w) efficiency (%) 2.0 1.5 1.0 0.5 10 20 30 40 50 60 70 80 90 100 0 0 2.5 z spk = 8 i + 68h z spk = 4 i + 33h v spk_vdd = 4.2v mclk = 12.288mhz lrclk = 48khz ni mode av skp_ = +8db efficiency vs. output power (dac to speaker) MAX98088 toc70 output power (w) efficiency (%) 1.4 1.2 0.8 1.0 0.4 0.6 0.2 10 20 30 40 50 60 70 80 90 100 0 0 1.6 z spk = 8 i + 68h z spk = 4 i + 33h v spk_vdd = 3.7v mclk = 12.288mhz lrclk = 48khz ni mode av skp_ = +8db supply current vs. supply voltage (dac to speaker) MAX98088 toc71 supply voltage (v) supply current (ma) 5.0 4.5 4.0 3.5 3.0 3 6 9 12 15 18 0 2.5 5.5 mclk = 12.288mhzlrclk = 48khz ni mode z spk_ = 8 i + 68h spkvol_ = +8dball zeros at input power-supply rejection ratio vs. frequency (dac to speaker) MAX98088 toc72 frequency (hz) psrr (db) 10,000 1000 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 100,000 v ripple = 200mv p-p ripple on avdd, dvdd, hpvdd ripple on spklvdd, spkrvdd downloaded from: http:///
________________________________________________________________ maxim integrated products 42 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) crosstalk vs. frequency (dac to speaker) MAX98088 toc73 frequency (hz) crosstalk (db) 10,000 1000 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 100,000 mclk = 12.288mhzlrclk = 48khz ni mode z spk_ = 8 i + 68h software turn-on/off response (dac to speaker, vsen = 0) MAX98088 toc74 scl1v/div speaker output 1v/div 10ms/div software turn-on/off response (dac to speaker, vsen = 1) MAX98088 toc75 scl1v/div speaker output 1v/div 10ms/div fft, -60dbfs (dac to speakers) MAX98088 toc76 frequency (khz) amplitude (dbv) 15,000 10,000 5000 -120 -100 -80 -60 -40 -20 0 20 -140 0 20,000 mclk = 12.2888mhzlrclk = 48khz ni mode z spk_ = 8 i + 68h fft, -60dbfs (dac to speakers) MAX98088 toc77 frequency (khz) amplitude (dbv) 15,000 10,000 5000 -120 -100 -80 -60 -40 -20 0 -140 0 20,000 mclk = 13mhzlrclk = 44.1khz pll mode z spk_ = 8 i + 68h wideband fft (dac to speaker) MAX98088 toc78 frequency (mhz) amplitude (dbm) 10 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 1 100 mclk = 13mhzlrclk = 44.1khz pll mode z spk_ = 8 i + 68h downloaded from: http:///
________________________________________________________________ maxim integrated products 43 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) line to speaker total harmonic distortion plus noise vs. output power (line to speaker) output power (w) thd+n ratio (db) 0.8 0.6 0.2 0.4 -70 -60 -50 -40 -20-30 -10 0 -80 0 1.0 MAX98088 toc79 f = 100hz f = 6000hz f = 1000hz z spk = 8 i + 68h av spk_ = +8db c in = 1f total harmonic distortion plus noise vs. frequency (line to speaker) MAX98088 toc80 frequency (hz) thd+n ratio (db) 10,000 1000 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 100,000 z spk = 8 i + 68h av spk_ = +8db c in = 1f p out = 0.25w p out = 0.5w gain vs. frequency (line to speaker) MAX98088 toc81 frequency (hz) normalized gain (db) 10,000 1000 100 -4 -3 -2 -1 0 1 2 3 4 5 -5 10 100,000 z fn = 8 i + 68h c in = 1f power-supply rejection ratio vs. frequency (line-in to speaker) MAX98088 toc82 frequency (hz) psrr (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 10 -90 10 100,000 ripple on spklvdd, spkrvdd inputs ac grounded vripple = 200mv p-p ripple on avdd, dvdd, hpvdd crosstalk vs. frequency (line to speaker) MAX98088 toc83 frequency (hz) crosstalk (db) 10,000 1000 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 100,000 z fn = 8 i + 68h c in = 1f left to right right to left downloaded from: http:///
________________________________________________________________ maxim integrated products 44 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) dac to headphone total harmonic distortion plus noise vs. output power (dac to headphone) MAX98088 toc84 output power (w) thd+n ratio (db) 0.04 0.03 0.02 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 0.05 f = 3000h z f = 1000h z f = 100h z mclk = 13mhzlrclk = 8khz freq mode r hp = 32 i av hp_ = +3db total harmonic distortion plus noise vs. output power (dac to headphone) MAX98088 toc85 output power (w) thd+n ratio (db) 0.04 0.03 0.02 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 0.05 mclk = 13mhzlrclk = 44.1khz pll mode r hp = 32 i av hp _ = +3db f = 6000h z f = 1000h z f = 100h z total harmonic distortion plus noise vs. output power (dac to headphone) MAX98088 toc86 output power (w) thd+n ratio (db) 0.04 0.03 0.02 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 0.05 mclk = 12.288mhzlrclk = 48khz ni mode r hp = 32 i av hp_ = +3db f = 6000h z f = 1000h z f = 100h z total harmonic distortion plus noise vs. output power (dac to headphone) MAX98088 toc87 output power (w) thd+n ratio (db) 0.04 0.03 0.02 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 0.05 mclk = 12.288mhzlrclk = 96khz ni mode r hp = 32 i av hp_ = +3db f = 6000h z f = 1000h z f = 100h z total harmonic distortion plus noise vs. output power (dac to headphone) MAX98088 toc88 output power (w) thd+n ratio (db) 0.07 0.06 0.04 0.05 0.02 0.03 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 0.08 mclk = 12.288mhzlrclk = 48khz ni mode r hp = 16 i av hp_ = +3db f = 6000h z f = 1000h z f = 100h z downloaded from: http:///
________________________________________________________________ maxim integrated products 45 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) total harmonic distortion plus noise vs. output power (dac to headphone) MAX98088 toc89 output power (w) thd+n ratio (db) 0.04 0.03 0.02 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 0 0.05 f = 6000h z f = 1000h z f = 100h z mclk = 12.288mhzlrclk = 48khz 256 fs mode low power mode r hp = 16 i av hp_ = +3db total harmonic distortion plus noise vs. output power (dac to headphone) MAX98088 toc90 frequency (hz) thd+n ratio (db) 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 10,000 p out = 0.01w p out = 0.02w mclk = 13mhzlrclk = 8khz freq mode r hp = 32 i av hp_ = +3db total harmonic distortion plus noise vs. frequency (dac to headphone) MAX98088 toc91 frequency (hz) thd+n ratio (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 mclk = 13mhzlrclk = 44.1khz pll mode r hp = 32 i av hp_ = +3db p out = 0.01w p out = 0.02w total harmonic distortion plus noise vs. frequency (dac to headphone) MAX98088 toc92 frequency (hz) thd+n ratio (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 mclk = 12.288mhzlrclk = 48khz ni mode r hp = 32 i av hp_ = +3db p out = 0.02w p out = 0.01w total harmonic distortion plus noise vs. frequency (dac to headphone) MAX98088 toc93 frequency (hz) thd+n ratio (db) 10,000 1000 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100,000 mclk = 12.288mhzlrclk = 96khz ni mode r hp = 32 i av hp_ = +3db p out = 0.02w p out = 0.01w total harmonic distortion plus noise vs. frequency (dac to headphone) MAX98088 toc94 frequency (hz) thd+n ratio (db) 10,000 1000 100 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 10 100,000 mclk = 12.288mhzlrclk = 48khz ni mode r hp = 16 i av hp_ = +3db p out = 0.01w p out = 0.02w downloaded from: http:///
________________________________________________________________ maxim integrated products 46 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) gain vs. frequency (dac to headphone) MAX98088 toc95 frequency (hz) normalized gain (dbra) 10,000 1000 100 -70 -60 -50 -40 -30 -20 -10 0 10 -80 10 100,000 mode = 1 mode = 0 mclk = 13mhzlrclk = 8khz freq mode r hp = 32 i pvdd current vs. output power (dac to headphone) MAX98088 toc96 output power per channel (mw) i pvdd (ma) 10 1 0.1 0.01 100 mclk = 12.288mhzlrclk = 48khz ni mode r hp = 32 i 120100 8060 40 140 0 20 r ph = 16 i r ph = 32 i pvdd current vs. output power (dac to headphone) MAX98088 toc97 output power per channel (mw) i pvdd (ma) 10 1 0.1 10 20 30 40 50 60 70 80 90 100 0 0.01 100 r ph = 16 i r ph = 32 i mclk = 12.288mhzlrclk = 48khz low power mode av hp_ = +3db power-supply rejection ratio vs. frequency (dac to headphone) MAX98088 toc98 frequency (hz) psrr (db) 10,000 1000 100 0 -100 10 100,000 -90 -80 -70 -60 -50 -40 -30 -20 -10 v ripple = 200mv p-p ripple on spklvdd, spkrvdd ripple on avdd, dvdd, hpvdd power-supply rejection ratio vs. frequency (dac to headphone) MAX98088 toc99 frequency (hz) psrr (db) 10,000 1000 100 0 -100 10 100,000 -90 -80 -70 -60 -50 -40 -30 -20 -10 v ripple = 200mv p-p low power mode ripple on spklvdd, spkrvdd ripple on avdd, dvdd, hpvdd downloaded from: http:///
________________________________________________________________ maxim integrated products 47 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) software turn-on/off response (dac to headphone, vsen = 0) MAX98088 toc101 scl1v/div headphone output 1v/div 10ms/div software turn-on/off response (dac to headphone, vsen = 1) MAX98088 toc102 scl1v/div headphone output 1v/div 10ms/div crosstalk vs. frequency (dac to headphone) MAX98088 toc100 frequency (hz) crosstalk (db) 10,000 1000 100 0 -100 10 100,000 -90 -80 -70 -60 -50 -40 -30 -20 -10 right to left left to right mclk = 12.288mhzlrclk = 48khz ni mode r hp = 32 i downloaded from: http:///
________________________________________________________________ maxim integrated products 48 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) fft, -60dbfs (dac to headphone) MAX98088 toc104 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 -140 02 0 mclk = 13mhz lrclk = 8khz freq mode r hp = 32 i fft, 0dbfs (dac to headphone) MAX98088 toc105 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 13mhz lrclk = 44.1khz pll mode r hp = 32 i fft, -60dbfs (dac to headphone) MAX98088 toc106 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 -160 -140 02 0 mclk = 13mhz lrclk = 44.1khz pll mode r hp = 32 i fft, 0dbfs (dac to headphone) MAX98088 toc103 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 13mhz lrclk = 8khz freq mode r hp = 32 i fft, 0dbfs (dac to headphone) MAX98088 toc107 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 12.288mhz lrclk = 48khz ni mode r hp = 32 i downloaded from: http:///
________________________________________________________________ maxim integrated products 49 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) fft, -60dbfs (dac to headphone) MAX98088 toc108 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 -160 -140 02 0 mclk = 12.288mhz lrclk = 48khz ni mode r hp = 32 i fft, 0dbfs (dac to headphone) MAX98088 toc109 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 20 -140 02 0 mclk = 12.288mhz lrclk = 96khz ni mode r hp = 32 i fft, -60dbfs (dac to headphone) MAX98088 toc110 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 -160 -140 02 0 mclk = 12.288mhz lrclk = 96khz ni mode r hp = 32 i fft, -60dbfs (dac to headphone) MAX98088 toc111 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 -160 -140 02 0 mclk = 12.288mhz lrclk = 48khz low power mode r hp = 32 i downloaded from: http:///
________________________________________________________________ maxim integrated products 50 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) fft, -60dbfs (dac to headphone) MAX98088 toc112 frequency (khz) amplitude (dbv) 15 10 5 -120 -100 -80 -60 -40 -20 0 -140 02 0 mclk = 12.288mhz lrclk = 48khz low power mode r hp = 32 i frequency (khz) 1000 100 10 1 0 10,000 wideband fft 0bfs (dac to headphone) MAX98088 toc113 0 -120 output amplitude (dbv) -100 -80 -60 -40 -20 mclk = 13mhz lrclk = 44.1khz pll mode r hp = 32 i frequency (khz) 1000 100 10 1 0.1 10,000 wideband fft -60dbfs (dac to headphone) MAX98088 toc114 0 -120 output amplitude (dbv) -100 -80 -60 -40 -20 mclk = 13mhz lrclk = 44.1khz pll mode r hp = 32 i frequency (khz) 1000 100 10 1 0 10,000 wideband fft 0bfs (dac to headphone) MAX98088 toc115 0 -120 output amplitude (dbv) -100 -80 -60 -40 -20 mclk = 12.288mhz lrclk = 48khz ni mode r hp = 32 i low power mode frequency (khz) 1000 100 10 1 0.1 10,000 wideband fft -60dbfs (dac to headphone) MAX98088 toc116 0 -120 off-isolation (db) -100 -80 -60 -40 -20 mclk = 12.288mhzlrclk = 48khz ni mode r hp = 32 i low power mode downloaded from: http:///
________________________________________________________________ maxim integrated products 51 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) line to headphone output power (w) 0.04 0.03 0.02 0.01 0 0.05 total harmonic distortion plus noise vs. output power (line to headphone) MAX98088 toc117 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 f = 1000hz f = 100hz 0 r hp = 32 i av hp_ = +3db c in = 1f f = 6000hz total harmonic distortion plus noise vs. frequency (line to headphone) MAX98088 toc118 frequency (hz) 10,000 1000 100 0 10 100,000 thd+n ratio (db) -90 -80 -70 -60 -50 -40 -30 -20 -10 r hp = 32 i av hp_ = +3db c in = 1f p out = 0.01w p out = 0.020w gain vs. frequency (line to headphone) MAX98088 toc119 frequency (hz) 10,000 1000 100 5 10 100,000 normalized gain (db) -5 -4 -3 -2 -1 0 1 2 3 4 r hp = 32 i c in = 1f power-supply rejection ratio vs. frequency (line to headphone) MAX98088 toc120 frequency (hz) psrr (db) 10,000 1000 100 0 -100 10 100,000 -90 -80 -70 -60 -50 -40 -30 -20 -10 v ripple = 200mv p-p ripple on spklvdd, spkrvdd ripple on avdd, dvdd, hpvdd crosstalk vs. frequency (line to headphones) MAX98088 toc121 frequency (hz) crosstalk (db) 10,000 1000 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 100,000 r hp = 32 i downloaded from: http:///
________________________________________________________________ maxim integrated products 52 MAX98088 stereo audio codec with flexsound technology typical operating characteristics (continued) (v avdd = v pvdd = v dvdd = v dvdds1 = v dvdds2 = +1.8v, v spklvdd = v spkrvdd = 3.7v. speaker loads (z spk ) connected between spk_p and spk_n. receiver load (r rec ) connected between recp and recn. headphone loads (r hp ) connected from hpl or hpr to hpgnd. r hp = j , r rec = j , z spk = j , c ref = 2.2 f f, c micbias = c reg = 1 f f, c c1n-c1p = 1 f f, c hpvdd = c hpvss = 1 f f. av micpre_ = +20db, av micpga_ = 0db, av dacattn = 0db, av dacgain = 0db, av adclvl = 0db, av adcgain = 0db, av pgain_ = 0db, av hp_ = 0db, av rec = 0db, av spk_ = 0db, mclk = 12.288mhz, lrclk = 48khz, mas = 1. t a = +25 n c, unless otherwise noted.) speaker bypass switch common-mode rejection ratio vs. frequency (line to headphones) MAX98088 toc122 100 0 frequency (hz) 10,000 1000 100 10 100,000 cmrr (db) 10 20 30 40 50 60 70 80 90 v out = -6dbv c in = 1f r hp = 32 i av pregain = 0db av pregain = 20db on-resistance vs. v com (speaker bypass switch) MAX98088 toc124 v com (v) r on ( i ) 5 4 1 2 3 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 06 v spk_vdd = 3.0v i sw = 20ma v spk_vdd = 3.7v v spk_vdd = 4.2v v spk_vdd = 5.0v total harmonic distortion plus noise vs. output power (speaker bypass switch) output power (w) thd+n (db) 0.20 0.15 0.05 0.10 -70 -60 -50 -40 -20-30 -10 0 -80 0 0.25 MAX98088 toc123 receiver amplifierdriving loudspeaker z spk = 8 i + 68h f = 1000khz f = 100hz f = 6000hz off-isolation vs. frequency (speaker bypass switch) MAX98088 toc125 0 -120 frequency (hz) 10,000 1000 100 10 100,000 off-isolation (db) -100 -80 -60 -40 -20 speaker amp driving loudspeakerspeaker bypass switch open measured at rxin_ 50 i load on rxin_ receiver amp driving rxin_ downloaded from: http:///
________________________________________________________________ maxim integrated products 53 MAX98088 stereo audio codec with flexsound technology pin configuration top view(bump side down) 1 2 3456789 b cd ef g MAX98088 a mclk irq spkrvdd spkrvdd lrclks1 spklgnd spkrp spklgnd n.c n.c. scl sda reg avdd dvdd ref micbias agnd mic2n spklvdd spklp spkrgnd spkln recn/ loutr/ rxinn spklvdd spklp spkrgnd spkln recp/ loutl/ rxinp pvdd hpvss spkrp dgnd spkrn spkrn hpl hpvdd hpgnd c1p c1n n.c. hpsns bclks1 sdouts1 n.c. n.c. inb1 jacksns n.c. inb2 hpr dvdds1 sdins1 mic1p/ digmicdata ina2/ extmicn bclks2 lrclks2 mic1n/ digmicclk ina1/ extmicp sdouts2 dvdds2 sdins2 mic2p downloaded from: http:///
________________________________________________________________ maxim integrated products 54 MAX98088 stereo audio codec with flexsound technology pin description pin name function a1, b1 spkrn negative right-channel class d speaker output a2, b2 spkrgnd right-speaker ground a3, b3 spklvdd left-speaker, ref, receiver amp power supply. bypass to spklgnd with a 1 f f and a 10 f f capacitor. a4, b4 spklp positive left-channel class d speaker output a5, b5 spkln negative left-channel class d speaker output a6 recp/loutl/ rxinp positive receiver amplifier output or left line output. can be positive bypass switch input when receiver amp is shut down. a7 pvdd headphone power supply. bypass to hpgnd with 1 f f and 10 f f capacitors. a8 hpvss inverting charge-pump output. bypass to hpgnd with a 1 f f ceramic capacitor. a9 hpgnd headphone ground b6 recn/loutr/ rxinn negative receiver amplifier output or right line output. can be negative bypass switch input when receiver amp is shut down. b7 c1p charge-pump flying capacitor positive terminal. connect a 1 f f ceramic capacitor between c1n and c1p. b8 c1n charge-pump flying capacitor negative terminal. connect a 1 f f ceramic capacitor between c1n and c1p. b9 hpvdd noninverting charge-pump output. bypass to hpgnd with a 1 f f ceramic capacitor. c1, c2 spkrp positive right-channel class d speaker output c3, d3 spkrvdd right-speaker power supply. bypass to spkrgnd with a 1 f f capacitor. c4, c5 spklgnd left-speaker ground c6, c7, d5, d6, d7, e3 n.c. no connection c8 hpsns headphone amplifier ground sense. connect to the headphone jack ground terminal or connect to ground. c9 hpl left-channel headphone output d1 bclks1 s1 digital audio bit clock input/output. bclks1 is an input when the ic is in slave mode and an output when in master mode. the input/output voltage is referenced to dvdds1. d2 sdouts1 s1 digital audio serial-data adc output. the output voltage is referenced to dvdds1. d4 lrclks1 s1 digital audio left-right clock input/output. lrclks1 is the audio sample rate clock and determines whether s1 audio data is routed to the left or right channel. in tdm mode, lrclks1 is a frame sync pulse. lrclks1 is an input when the ic is in slave mode and an output when in master mode. d8 inb2 single-ended line input b2. also positive differential line input b. d9 hpr right-channel headphone output e1 dvdds1 s1 digital audio interface power-supply input. bypass to dgnd with a 1 f f capacitor. e2 mclk master clock input. acceptable input frequency range is 10mhz to 60mhz. e4 sdins1 s1 digital audio serial-data dac input. the input/output voltage is referenced to dvdds1. downloaded from: http:///
________________________________________________________________ maxim integrated products 55 MAX98088 stereo audio codec with flexsound technology pin description (continued) pin name function e5 irq hardware interrupt output. irq can be programmed to pull low when bits in status register 0x00 change state. read status register 0x00 to clear irq once set. repeat faults have no effect on irq until it is cleared by reading the i 2 c status register 0x00. connect a 10k i pullup resistor to dvdd for full output swing. e6 jacksns jack sense. detects the insertion of a jack. see the jack detection section. e7 inb1 single-ended line input b1. also negative differential line input b. e8 mic1p/ digmicdata positive differential microphone 1 input. ac-couple a microphone with a series 1 f f capaci - tor. can be retasked as a digital microphone data input. e9 ina2/ extmicn single-ended line input a2. also positive differential line input a or negative differential external microphone input. f1 dgnd digital ground f2 bclks2 s2 digital audio bit clock input/output. bclks2 is an input when the ic is in slave mode and an output when in master mode. the input/output voltage is referenced to dvdds2. f3 lrclks2 s2 digital audio left-right clock input/output. lrclks2 is the audio sample rate clock and determines whether audio data on s2 is routed to the left or right channel. in tdm mode, lrclks2 is a frame sync pulse. lrclks2 is an input when the ic is in slave mode and an output when in master mode. the input/output voltage is referenced to dvdds2. f4 sda i 2 c serial-data input/output. connect a pullup resistor to dvdd for full output swing. f5 scl i 2 c serial-clock input. connect a pullup resistor to dvdd for full output swing. f6 reg common-mode voltage reference. bypass to agnd with a 1 f f capacitor. f7 micbias low-noise bias voltage. outputs a 2.2v microphone bias. an external 2.2k i resistor should be placed between micbias and the microphone output. f8 mic1n/ digmicclk negative differential microphone 1 input. ac-couple a microphone with a series 1 f f capacitor. can be retasked as a digital microphone clock output. f9 ina1/ extmicp single-ended line input a1. also negative differential line input a or positive differential external microphone input. g1 sdouts2 s2 digital audio serial-data adc output. the output voltage is referenced to dvdds2. g2 dvdds2 s2 digital audio interface power-supply input. bypass to dgnd with a 1 f f capacitor. g3 sdins2 s2 digital audio serial-data dac input. the input voltage is referenced to dvdds2. g4 dvdd digital power supply. supply for the digital core and i 2 c interface. bypass to dgnd with a 1 f f capacitor. g5 avdd analog power supply. bypass to agnd with a 1 f f capacitor. g6 ref converter reference. bypass to agnd with a 2.2 f f capacitor. g7 agnd analog ground g8 mic2n negative differential microphone 2 input. ac-couple a microphone with a series 1 f f capacitor. g9 mic2p positive differential microphone 2 input. ac-couple a microphone with a series 1 f f capacitor. downloaded from: http:///
________________________________________________________________ maxim integrated products 56 MAX98088 stereo audio codec with flexsound technology detailed description the MAX98088 is a fully integrated stereo audio codec with flexsound technology and integrated amplifiers. two differential microphone amplifiers can accept signals from three analog inputs. one input can be retasked to support two digital microphones. any combination of two microphones (analog or digital) can be recorded simul - taneously. the analog signals are amplified up to 50db and recorded by the stereo adc. the digital record path supports voice filtering with selectable preset highpass filters and high stopband attenuation at f s /2. an automat - ic gain control (agc) circuit monitors the digitized signal and automatically adjusts the analog microphone gain to make best use of the adc?s dynamic range. a noise gate attenuates signals below the user-defined threshold to minimize the noise output by the adc. the ic includes two analog line inputs. one of the line inputs can be optionally retasked as a third analog micro - phone input. both line inputs support either stereo single- ended input signals or mono differential signals. the line inputs are preamplified and then routed to the adc for recording and/or to the output amplifiers for playback. the single-ended line input signals from ina1 and ina2 can bypass the pgas, and be connected directly to the adc input to provide the best dynamic range. integrated analog switches allow two differential micro - phone signals to be routed out the third microphone input to an external device. this eliminates the need for an external analog switch in systems that have two devices recording signals from the same microphone. through two digital audio interfaces, the device can transmit one stereo audio signal and receive two stereo audio signals in a wide range of formats including i 2 s, pcm, and up to four mono slots in tdm. each interface can be connected to either of two audio ports (s1 and s2) for communication with external devices. both audio interfaces support 8khz to 96khz sample rates. each input signal is independently equalized using 5-band parametric equalizers. a multiband automatic level con - trol (alc) boosts signals by up to 12db. one signal path additionally supports the same voiceband filtering as the adc path. the ic includes a stereo class d speaker amplifier, a high-efficiency class h stereo headphone amplifier, and a differential receiver amplifier that can be configured as a stereo single-ended line output. when the receiver amplifier is disabled, analog switches allow recp/rxinp and recn/rxinn to be reused for signal routing. in systems where a single transducer is used for both the loudspeaker and receiver, an exter - nal receiver amplifier can be routed to the left speaker through recp/rxinp and recn/rxinn, bypassing the class d amplifier, to connect to the loudspeaker. if the internal receiver amplifier is used, then leave recp/ rxinp and recn/rxinn unconnected. in systems where an external amplifier drives both the receiver and the MAX98088?s line input, one of the differential signals can be disconnected from the receiver when not needed by passing it through the analog switch that connects recp/rxinp to recn/rxinn. the stereo class d amplifier provides efficient amplifica - tion for two speakers. the amplifier includes active emis - sions limiting to minimize the radiated emissions (emi) traditionally associated with class d. in most systems, no output filtering is required to meet standard emi limits. to optimize speaker sound quality, the ic includes an excursion limiter, a distortion limiter, and a power limiter. the excursion limiter is a dynamic highpass filter with variable corner frequency that increases in response to high signal levels. low-frequency energy typically causes more distortion than useful sound at high sig - nal levels, so attenuating low frequencies allows the speaker to play louder without distortion or damage. at lower signal levels, the filter corner frequency reduces to pass more low frequency energy when the speaker can handle it. the distortion limiter reduces the volume when the output signal exceeds a preset distortion level. this ensures that regardless of input signal and battery voltage, excessive distortion is never heard by the user. the power limiter monitors the continuous power into the loudspeaker and lowers the signal level if the speaker is at risk of overheating. the stereo class h headphone amplifier uses a dual- mode charge pump to maximize efficiency while out - putting a ground-referenced signal. this eliminates the need for dc-blocking capacitors or a midrail bias for the headphone jack ground return. ground sense reduces output noise caused by ground return current. the ic integrates jack detection allowing the detection of insertion and removal of accessories. downloaded from: http:///
________________________________________________________________ maxim integrated products 57 MAX98088 stereo audio codec with flexsound technology i 2 c slave address configure the MAX98088 using the i 2 c control bus. the ic uses a slave address of 0x20 or 00100000 for write operations and 0x21 or 00100001 for read operations. see the i 2 c serial interface section for a complete inter - face description. registers table 1 lists all of the registers, their addresses, and power-on-reset states. registers 0x00 to 0x03 and 0xff are read-only while all of the other registers are read/ write. write zeros to all unused bits in the register table when updating the register, unless otherwise noted. table 1. register map register b7 b6 b5 b4 b3 b2 b1 b0 address default r/w page status status cld sld ulk ? ? ? jdet ? 0x00 ? r 111 microphone agc/ng ng agc 0x01 ? r 70 jack status ? jksns ? ? ? ? ? ? 0x02 ? r 110 battery voltage ? ? ? vbat 0x03 ? r/w 110 interrupt enable icld isld iulk 0 0 0 ijdet 0 0x0f 0x00 r/w 111 master clock controlmaster clock 0 0 psclk 0 0 0 0 0x10 0x00 r/w 81 dai1 clock controlclock mode sr1 freq1 0x11 0x00 r/w 81, 82 any clock control pll1 ni1[14:8] 0x12 0x00 r/w 82 ni1[7:1] ni1[0] 0x13 0x00 r/w 82 dai1 configuration format mas1 wci1 bci1 dly1 0 tdm1 fsw1 ws1 0x14 0x00 r/w 76 clock adc_osr1 dac_ors1 0 0 bsel1 0x15 0x00 r/w 77 i/o configuration sel1 lten1 lben1 dmono1 hizoff1 sdoen1 sdien1 0x16 0x00 r/w 77, 78 time-division multiplex slotl1 slotr1 slotdly1 0x17 0x00 r/w 78 filters mode1 avflt1 dhf1 dvflt1 0x18 0x00 r/w 86 dai2 clock control clock mode sr2 0 0 0 0 0x19 0x00 r/w 81 any clock control pll2 ni2[14:8] 0x1a 0x00 r/w 82 ni2[7:1] ni2[0] 0x1b 0x00 r/w 82 dai2 configuration format mas2 wci2 bci2 dly2 0 tdm2 fsw2 ws2 0x1c 0x00 r/w 76 clock 0 0 dac_ ors2 0 0 bsel2 0x1d 0x00 r/w 77 i/o configuration sel2 0 lben2 dmono2 hizoff2 sdoen2 sdien2 0x1e 0x00 r/w 77, 78 downloaded from: http:///
________________________________________________________________ maxim integrated products 58 MAX98088 stereo audio codec with flexsound technology table 1. register map (continued) register b7 b6 b5 b4 b3 b2 b1 b0 address default r/w page time-division multiplex slotl2 slotr2 slotdly2 0x1f 0x00 r/w 78 filters 0 0 0 0 dhf2 0 0 dcb2 0x20 0x00 r/w 86 src sample rate converter 0 0 0 srmix_ mode srmix_ enl srmix_ enr src_ enl src_ enr 0x21 0x00 r/w 85 mixersdac mixer mixdal mixdar 0x22 0x00 r/w 92 left adc mixer mixadl 0x23 0x00 r/w 69 right adc mixer mixadr 0x24 0x00 r/w 69 left headphone amplifier mixer mixhpl 0x25 0x00 r/w 105 right headphone amplifier mixer mixhpr 0x26 0x00 r/w 105 headphone amplifier mixer control 0 0 mixhpr_ pathsel mixhpl_ pathsel mixhpr_gain mixhpl_gain 0x27 0x00 r/w 105 left receiver amplifier mixer mixrecl 0x28 0x00 r/w 94 right receiver amplifier mixer mixrecr 0x29 0x00 r/w 94 receiver amplifier mixer control line_ mode 0 0 0 mixrecr_gain mixrecl_gain 0x2a 0x00 r/w 94 left speaker amplifier mixer mixspl 0x2b 0x00 r/w 97 right speaker amplifier mixer mixspr 0x2c 0x00 r/w 97 speaker amplifier mixer control 0 0 0 0 mixspr_gain mixspl_gain 0x2d 0x00 r/w 97 downloaded from: http:///
________________________________________________________________ maxim integrated products 59 MAX98088 stereo audio codec with flexsound technology table 1. register map (continued) register b7 b6 b5 b4 b3 b2 b1 b0 address default r/w page level control sidetone dsts 0 dvst 0x2e 0x00 r/w 74 dai1 playback level dv1m 0 dv1g dv1 0x2f 0x00 r/w 91 dai1 playback level 0 0 0 eqclp1 dveq1 0x30 0x00 r/w 90 dai2 playback level dv2m 0 0 0 dv2 0x31 0x00 r/w 91 dai2 playback level 0 0 0 eqclp2 dveq2 0x32 0x00 r/w 90 left adc level 0 0 avlg avl 0x33 0x00 r/w 73 right adc level 0 0 avrg avr 0x34 0x00 r/w 73 microphone 1 input level 0 pa1en pgam1 0x35 0x00 r/w 66 microphone 2 input level 0 pa2en pgam2 0x36 0x00 r/w 66 ina input level 0 inaext 0 0 0 pgaina 0x37 0x00 r/w 68 inb input level 0 inbext 0 0 0 pgainb 0x38 0x00 r/w 68 left headphone amplifier volume control hplm 0 0 hpvoll 0x39 0x00 r/w 106 right headphone amplifier volume control hprm 0 0 hpvolr 0x3a 0x00 r/w 106 left receiver amplifier volume control reclm 0 0 recvoll 0x3b 0x00 r/w 95 right receiver amplifier volume control recrm 0 0 recvolr 0x3c 0x00 r/w 95 downloaded from: http:///
________________________________________________________________ maxim integrated products 60 MAX98088 stereo audio codec with flexsound technology table 1. register map (continued) register b7 b6 b5 b4 b3 b2 b1 b0 address default r/w page left speaker amplifier volume control splm 0 0 spvoll 0x3d 0x00 r/w 98 right speaker amplifier volume control sprm 0 0 spvolr 0x3e 0x00 r/w 98 microphone agcconfiguration agcsrc agcrls agcatk agchld 0x3f 0x00 r/w 70, 71 threshold anth agcth 0x40 0x00 r/w 71 speaker signal processing excursion limiter filter 0 dhpucf 0 0 dhplcf 0x41 0x00 r/w 100 excursion limiter threshold 0 0 0 0 0 dhpth 0x42 0x00 r/w 100 alc alcen alcrls alcmb alcth 0x43 0x00 r/w 89, 100 power limiter pwrth 0 pwrk 0x44 0x00 r/w 101 power limiter pwrt2 pwrt1 0x45 0x00 r/w 102 distortion limiter thdclp 0 0 0 thdt1 0x46 0x00 r/w 103 configurationaudio input inadiff inbdiff 0 0 0 0 0 0 0x47 0x00 r/w 68 microphone micclk digmicl digmicr 0 0 extmic 0x48 0x00 r/w 66 level control vs2en vsen zden 0 0 0 eq2en eq1en 0x49 0x00 r/w 90, 108 bypass switches inabyp 0 0 mic2byp 0 0 recbyp spkbyp 0x4a 0x00 r/w 67, 107 jack detection jdeten 0 0 0 0 0 jdeb 0x4b 0x00 r/w 110 power management input enable inaen inben 0 0 mben 0 adlen adren 0x4c 0x00 r/w 63 output enable hplen hpren splen spren reclen recren dalen daren 0x4d 0x00 r/w 64 top-level bias control bgen spregen vcmen biasen 0 0 0 0 0x4e 0xf0 r/w 64 dac low power mode 1 dai2_dac_lp dai1_dac_lp 0x4f 0x00 r/w 83 dac low power mode 2 0 0 0 0 dac2_ip_ dith_en dac1_ip_ dith_en cgm2_ en cgm1_ en 0x50 0x0f r/w 83 system shutdown shdn vbaten 0 0 perfmode hpplyback pwrsv8k pwrsv 0x51 0x00 r/w 63, 100 downloaded from: http:///
________________________________________________________________ maxim integrated products 61 MAX98088 stereo audio codec with flexsound technology table 1. register map (continued) register b7 b6 b5 b4 b3 b2 b1 b0 address default r/w page dsp coefficients eq band 1(dai1/dai2) k_1[15:8] 0x52/0x84 0xxx r/w 89 k_1[7:0] 0x53/0x85 0xxx r/w 89 k1_1[15:8] 0x54/0x86 0xxx r/w 89 k1_1[7:0] 0x55/0x87 0xxx r/w 89 k2_1[15:8] 0x56/0x88 0xxx r/w 89 k2_1[7:0] 0x57/0x89 0xxx r/w 89 c1_1[15:8] 0x58/0x8a 0xxx r/w 89 c1_1[7:0] 0x59/0x8b 0xxx r/w 89 c2_1[15:8] 0x5a/0x8c 0xxx r/w 89 c2_1[7:0] 0x5b/0x8d 0xxx r/w 89 eq band 2(dai1/dai2) k_2[15:8] 0x5c/0x8e 0xxx r/w 89 k_2[7:0] 0x5d/0x8f 0xxx r/w 89 k1_2[15:8] 0x5e/0x90 0xxx r/w 89 k1_2[7:0] 0x5f/0x91 0xxx r/w 89 k2_2[15:8] 0x60/0x92 0xxx r/w 89 k2_2[7:0] 0x61/0x93 0xxx r/w 89 c1_2[15:8] 0x62/0x94 0xxx r/w 89 c1_2[7:0] 0x63/0x95 0xxx r/w 89 c2_2[15:8] 0x64/0x96 0xxx r/w 89 c2_2[7:0] 0x65/0x97 0xxx r/w 89 eq band 3(dai1/dai2) k_3[15:8] 0x66/0x98 0xxx r/w 89 k_3[7:0] 0x67/0x99 0xxx r/w 89 k1_3[15:8] 0x68/0x9a 0xxx r/w 89 k1_3[7:0] 0x69/0x9b 0xxx r/w 89 k2_3[15:8] 0x6a/0x9c 0xxx r/w 89 k2_3[7:0] 0x6b/0x9d 0xxx r/w 89 c1_3[15:8] 0x6c/0x9e 0xxx r/w 89 c1_3[7:0] 0x6d/0x9f 0xxx r/w 89 c2_3[15:8] 0x6e/0xae 0xxx r/w 89 c2_3[7:0] 0x6f/0xa1 0xxx r/w 89 eq band 4(dai1/dai2) k_4[15:8] 0x70/0xa2 0xxx r/w 89 k_4[7:0] 0x71/0xa3 0xxx r/w 89 k1_4[15:8] 0x72/0xa4 0xxx r/w 89 k1_4[7:0] 0x73/0xa5 0xxx r/w 89 k2_4[15:8] 0x74/0xa6 0xxx r/w 89 k2_4[7:0] 0x75/0xa7 0xxx r/w 89 c1_4[15:8] 0x76/0xa8 0xxx r/w 89 c1_4[7:0] 0x77/0xa9 0xxx r/w 89 c2_4[15:8] 0x78/0xaa 0xxx r/w 89 c2_4[7:0] 0x79/0xab 0xxx r/w 89 downloaded from: http:///
________________________________________________________________ maxim integrated products 62 MAX98088 stereo audio codec with flexsound technology table 1. register map (continued) register b7 b6 b5 b4 b3 b2 b1 b0 address default r/w page eq band 5(dai1/dai2) k_5[15:8] 0x7a/0xac 0xxx r/w 89 k_5[7:0] 0x7b/0xad 0xxx r/w 89 k1_5[15:8] 0x7c/0xae 0xxx r/w 89 k1_5[7:0] 0x7d/0xaf 0xxx r/w 89 k2_5[15:8] 0x7e/0xb0 0xxx r/w 89 k2_5[7:0] 0x7f/0xb1 0xxx r/w 89 c1_5[15:8] 0x80/0xb2 0xxx r/w 89 c1_5[7:0] 0x81/0xb3 0xxx r/w 89 c2_5[15:8] 0x82/0xb4 0xxx r/w 89 c2_5[7:0] 0x83/0xb5 0xxx r/w 89 excursion limiter biquad (dai1/dai2) a1[15:8] 0xb6/0xc0 0xxx r/w 89 a1[7:0] 0xb7/0xc1 0xxx r/w 89 a2[15:8] 0xb8/0xc2 0xxx r/w 89 a2[7:0] 0xb9/0xc3 0xxx r/w 89 b0[15:8] 0xba/0xc4 0xxx r/w 89 b0[7:0] 0xbb/0xc5 0xxx r/w 89 b1[15:8] 0xbc/0xc6 0xxx r/w 89 b1[7:0] 0xbd/0xc7 0xxx r/w 89 b2[15:8] 0xbe/0xc8 0xxx r/w 89 b2[7:0] 0xbf/0xc9 0xxx r/w 89 revision idrev id rev 0xff 0x40 r 112 downloaded from: http:///
________________________________________________________________ maxim integrated products 63 MAX98088 stereo audio codec with flexsound technology power management the ic includes comprehensive power management to allow the disabling of all unused circuits, minimizing supply current. table 2. power management registers register bit name description 0x51 7 shdn global shutdown. disables everything except the headset detection circuitry, which is controlled separately.0 = device shutdown 1 = device enabled 6 vbaten see the battery measurement section. 3 perfmode performance mode. selects dac to headphone playback performance mode. 0 = high performance playback mode.1 = low power playback mode. 2 hpplybck headphone only playback mode. configures system bias control register bits for low power playback when using dac to headphone playback path only. when enabled, this bit overrides the system bias control register settings. when disabled, the system bias control register is used to enable system bias blocks. set both hpplybck and perfmode for lowest power consumption when using dac to headphone playback path only. 0 = disabled 1 = enabled 1 pwrsv8k 8khz power save mode. pwrsv8k configures the adc for reduced power consump - tion when f s = 8khz. pwrsv8k can be used in conjunction with pwrsv when f s = 8khz for more power savings.0 = normal, high-performance mode. 1 = low power mode. 0 pwrsv power save mode. pwrsv configures the adc for reduced power consumption for all sample rates. pwrsv can be used in conjunction with pwrsv8k for more power sav - ings.0 = normal, high-performance mode. 1 = low power mode. 0x4c 7 inaen line input a enable0 = disabled 1 = enabled 6 inben line input b enable0 = disabled 1 = enabled 3 mben microphone bias enable0 = disabled 1 = enabled 1 adlen left adc enable0 = disabled 1 = enabled 0 adren right adc enable0 = disabled 1 = enabled downloaded from: http:///
________________________________________________________________ maxim integrated products 64 MAX98088 stereo audio codec with flexsound technology table 2. power management registers (continued) register bit name description 0x4d 7 hplen left headphone enable0 = disabled 1 = enabled 6 hpren right headphone enable0 = disabled 1 = enabled 5 splen left speaker enable0 = disabled 1 = enabled 4 spren right speaker enable0 = disabled 1 = enabled 3 reclen receiver/left line output enable. use this bit to enable the differential receiver output or left line output.0 = disabled 1 = enabled 2 recren right line output enable. use this bit to enable the right line output. 0 = disabled1 = enabled 1 dalen left dac enable0 = disabled 1 = enabled 0 daren right dac enable0 = disabled 1 = enabled 0x4e 7 bgen bandgap enable. must be enabled for proper operation of 2.5v regulator and associ - ated circuitry.0 = disabled 1 = enabled 6 spregen 2.5v regulator enable. spregen enables a 2.5v internal regulator required for the adc, speaker and receiver/line out amplifier. the 2.5v regulator is powered by spklvdd. 0 = disabled 1 = enabled 5 vcmen common-mode voltage resistor string enable. vcmen enables the common mode voltage for the input and output amplifiers in the codec.0 = disabled 1 = enabled 4 biasen chip bias enable. biasen needs to be set for the codec amplifiers to be enabled. 0 = disabled1 = enabled downloaded from: http:///
________________________________________________________________ maxim integrated products 65 MAX98088 stereo audio codec with flexsound technology microphone inputs the device includes three differential microphone inputs and a low-noise microphone bias for powering the micro - phones ( figure 6 ). one microphone input can also be con - figured as a digital microphone input accepting signals from up to two digital microphones. any two microphones, analog or digital, can be recorded simultaneously. in the typical application, one microphone input is used for the handset microphone and the other is used as an accessory microphone. in systems using a background noise microphone, ina can be retasked as another microphone input. in systems where the codec is not the only device recording microphone signals, connect microphones to mic2p/mic2n and extmicp/extmicn. mic1p/mic1n then become outputs that route the microphone signals to an external device as needed. two devices can then record microphone signals without needing external analog switches. analog microphone signals are amplified by two stages of gain and then routed to the adcs. the first stage offers selectable 0db, 20db, or 30db settings. the second stage is a programmable-gain amplifier (pga) adjustable from 0db to 20db in 1db steps. to maximize the signal- to-noise ratio, use the gain in the first stage whenever possible. zero-crossing detection is included on the pga to minimize zipper noise while making gain changes. figure 6. microphone input block diagram mi c1p/ d igm i cda ta micbias mben mclk reg mi c1n/ d igm i ccl k mi c2byp inabyp extmic pa1en: 0/20/30db pgam1:+20db to 0db mixmix mixadl mixadr adcl extmic pa2en: 0/20/30db pgaina:+20db to -6db pgaina:+20db to -6db mi c2p mi c2n in a1/ex tm ic p pgam1:+20db to 0db inadiff adlen agc control adren in a2/ex tm ic n adcr clock control downloaded from: http:///
________________________________________________________________ maxim integrated products 66 MAX98088 stereo audio codec with flexsound technology table 3. microphone input registers register bit name description 0x35/0x36 6 pa1en/pa2en mic1/mic2 preamplifier gaincourse microphone gain adjustment. 00 = preamplifier disabled 01 = 0db 10 = 20db 11 = 30db 54 pgam1/pgam2 mic1/mic2 pgafine microphone gain adjustment. 3 value gain (db) value gain (db) 0x00 +20 0x0b +9 0x01 +19 0x0c +8 2 0x02 +18 0x0d +7 0x03 +17 0x0e +6 0x04 +16 0x0f +5 1 0x05 +15 0x10 +4 0x06 +14 0x11 +3 0x07 +13 0x12 +2 0 0x08 +12 0x13 +1 0x09 +11 0x14 to 0x1f 0 0x0a +10 0x48 7 micclk digital microphone clock frequencyselect a frequency that is within the digital microphone?s clock frequency range. set osr1 = 1 when using a digital microphone. 00 = pclk/8 01 = pclk/6 10 = 64 x lrclk 11 = reserved 6 5 digmicl left digital microphone enableset pa1en = 00 for proper operation. 0 = disabled 1 = enabled 4 digmicr right digital microphone enableset pa1en = 00 for proper operation. 0 = disabled 1 = enabled 1 extmic external microphone connectionroutes ina_/extmic_ to the microphone preamplifiers. set inaen = 0 when using ina_/extmic_ as a microphone input. 00 = disabled 01 = mic1 input 10 = mic2 input 11 = reserved 0 downloaded from: http:///
________________________________________________________________ maxim integrated products 67 MAX98088 stereo audio codec with flexsound technology line inputs the device includes two sets of line inputs ( figure 7 ). each set can be configured as a stereo single-ended input or as a mono differential input. each input includes adjustable gain to match a wide range of input signal levels. if a custom gain is needed, the external gain mode provides a trimmed feedback resistor. set the gain by choosing the appropriate input resistor and using the following formula: av pgain = 20 x log (20k i /r in ) the external gain mode also allows summing multiple signals into a single input, by connecting multiple input resistors as show in figure 8 , and/or inputting signals larger than 1v p-p by adjusting the ratio of the 20k i /r in less than 1. table 3. microphone input registers (continued) figure 7. line input block diagram figure 8. summing multiple input signals into ina/inb register bit name description 0x4a 7 inabyp ina_/extmic_ to mic1_ bypass switch0 = disabled 1 = enabled 4 mic2byp mic1_ to mic2_ bypass switch0 = disabled 1 = enabled 1 recbyp see the output bypass switches section. 0 spkbyp inadiff pgaina:+20db to -6db inabyp inbdiff ina1/ extmicp ina2/ extmicn inb1inb2 pgaina:+20db to -6db pgainb:+20db to -6db pgainb:+20db to -6db left input 1 left input 2 ina1/extmicp vcm 1v p-p (max) 1v p-p (max) ina2/extmicn 20k i right input 1 right input 2 vcm 20k i downloaded from: http:///
________________________________________________________________ maxim integrated products 68 MAX98088 stereo audio codec with flexsound technology adc input mixers the ic?s stereo adc accepts input from the microphone amplifiers, line inputs amplifiers, and directly from the ina1 and ina2. the adc mixer routes any combina - tion of the eight audio inputs to the left and right adcs ( figure 9 ). table 4. line input registers figure 9. adc input mixer block diagram register bit name description 0x37/0x38 6 inaext/inbext line input a/b external gainswitches out the internal input resistor and selects a trimmed 20k i feedback resistor. use an external input resistor to set the gain of the line input.0 = disabled 1 = enabled 2 pgaina/pgainb line input a/b internal gain settings000 = +20db 001 = +14db 010 = +3db 011 = 0db 100 = -3db 101 = -6db 110 = -6db 111 = -6db 10 0x47 7 inadiff line input a differential enable0 = stereo single-ended input 1 = mono differential input 6 inbdiff line input b differential enable0 = stereo single-ended input 1 = mono differential input inbdiff pgainb:+20db to -6db + pgainb:+20db to -6db inadiff pgaina:+20db to -6db + pgaina:+20db to -6db pgam2:+20db to 0db pgam1:+20db to 0db mixadr adren adlen mix mixadl mix pa2en:0/20/30db pa1en:0/20/30db adcr adcl downloaded from: http:///
________________________________________________________________ maxim integrated products 69 MAX98088 stereo audio codec with flexsound technology record path signal processing the device?s record signal path includes both automatic gain control (agc) for the microphone inputs and a digi - tal noise gate at the output of the adc ( figure 10 ). microphone agc the ic?s agc monitors the signal level at the output of the adc and then adjusts the mic1 and mic2 analog pga settings automatically. when the signal level is below the predefined threshold, the gain is increased up to its maximum (20db). if the signal exceeds the threshold, the gain is reduced to prevent the output signal level exceeding the threshold. when agc is enabled, the microphone pga is not user programmable. the agc provides a more constant signal level and improves the available adc dynamic range. noise gate since the agc increases the levels of all signals below a user-defined threshold, the noise floor is effectively increased by 20db. to counteract this, the noise gate reduces the gain at low signal levels. unlike typical noise gates that completely silence the output below a defined level, the noise gate in the ic applies downward expan - sion. the noise gate attenuates the output at a rate of 1db for each 2db the signal is below the threshold with a maximum attenuation of 12db. the noise gate can be used in conjunction with the agc or on its own. when the agc is enabled, the noise gate reduces the output level only when the agc has set the gain to the maximum setting. figure 11 shows the gain response resulting from using the agc and noise gate. table 5. adc input mixer register figure 10. record path signal processing block diagram figure 11. agc and noise gate input vs. output gain register bit name description 0x23/0x24 7 mixadl/mixadr left/right adc input mixerselects which analog inputs are recorded by the left/right adc. 1xxxxxxx = mic1 x1xxxxxx = mic2 xx1xxxxx = ina1 pin direct xxx1xxxx = ina2 pin direct xxxx1xxx = ina1 xxxxx1xx = ina2 (inadiff = 0) or ina2 - ina1 (inadiff = 1) xxxxxx1x = inb1 xxxxxxx1 = inb2 (inbdiff = 0) or inb2 - inb1 (inbdiff = 1) 65 4 3 2 1 0 agc and noise gate amplitude response input amplitude (dbfs) agc only agc and noise gate noise gate only agc and noise gate disabled output amplitude (dbfs) -20 -40 -60 -80 -100 -120 -100 -80 -60 -40 -20 0 -120 0 pgam2:+20db to 0db pgam1:+20db to -6db mixadr mix pa2en:0/20/30db pa1en:0/20/30db mixadl mix adren adlen adcr adcl automatic gain control noise gate mode1 avflt srmix_ mode avlg: 0/6/ 12/18db avl:0db to -15db avrg: 0/6/12/18db avr:0db to -15db audio/ voice filters sample rate converter downloaded from: http:///
________________________________________________________________ maxim integrated products 70 MAX98088 stereo audio codec with flexsound technology table 6. record path signal processing registers register bit name description 0x01 7 ng noise gate attenuationreports the current noise gate attenuation. 000 = 0db 001 = 1db 010 = 2db 011 = 3db to 5db 100 = 6db to 7db 101 = 8db to 9db 110 = 10db to 11db 111 = 12db 65 4 agc agc gainreports the current agc gain setting. value gain (db) value gain (db) 3 0x00 +20 0x0b +9 0x01 +19 0x0c +8 0x02 +18 0x0d +7 2 0x03 +17 0x0e +6 0x04 +16 0x0f +5 0x05 +15 0x10 +4 1 0x06 +14 0x11 +3 0x07 +13 0x12 +2 0x08 +12 0x13 +1 0 0x09 +11 0x14 to 0x1f 0 0x0a +10 0x3f 7 agcsrc agc/noise gate signal sourcedetermines which adc channel the agc and noise gates analyze. gain is adjusted on both channels regardless of the agcsrc setting. 0 = left adc output 1 = maximum of either the left or right adc output 6 agcrls agc release timedefined as the duration from start to finish of gain increase in the region shown in figure 12. 000 = 78ms 001 = 156ms 010 = 312ms 011 = 625ms 100 = 1.25s 101 = 2.5s 110 = 5s 111 = 10s 54 downloaded from: http:///
________________________________________________________________ maxim integrated products 71 MAX98088 stereo audio codec with flexsound technology table 6. record path signal processing registers (continued) register bit name description 0x3f 3 agcatk agc attack timedefined as the time required to reduce gain by 63% of the total gain reduction (one time constant of the exponential response). attack times are longer for low agc threshold levels. see figure 12 for details. 00 = 2ms 01 = 7.2ms 10 = 31ms 11 = 123ms 21 agchld agc hold timethe delay before the agc release begins. the hold time counter starts whenever the signal drops below the agc threshold and is reset by any signal that exceeds the threshold. set agchld to enable the agc circuit. see figure 12 for details. 00 = agc disabled 01 = 50ms 10 = 100ms 11 = 400ms 0 0x40 7 anth noise gate thresholdgain is reduced for signals below the threshold to quiet noise. the thresholds are rela - tive to the adc?s full-scale output voltage. 6 value threshold (dbfs) value threshold (dbfs) 0x0 noise gate disabled 0x8 -45 0x1 reserved 0x9 -41 5 0x2 reserved 0xa -38 0x3 -64 0xb -34 0x4 -62 0xc -30 4 0x5 -58 0xd -27 0x6 -53 0xe -22 0x7 -50 0xf -16 3 agcth agc thresholdgain is reduced when signals exceed the threshold to prevent clipping. the thresholds are relative to the adc?s full-scale voltage. 2 value threshold (dbfs) value threshold (dbfs) 0x0 -3 0x8 -11 0x1 -4 0x9 -12 1 0x2 -5 0xa -13 0x3 -6 0xb -14 0x4 -7 0xc -15 0 0x5 -8 0xd -16 0x6 -9 0xe -17 0x7 -10 0xf -18 downloaded from: http:///
________________________________________________________________ maxim integrated products 72 MAX98088 stereo audio codec with flexsound technology figure 12. agc timing adc record level control the ic includes separate digital level control for the left and right adc outputs ( figure 13 ). to optimize dynamic range, use analog gain to adjust the signal level and set the digital level control to 0db whenever possible. digital level control is primarily used when adjusting the record level for digital microphones. figure 13. adc record level control block diagram attack time hold time release time adren adlen adcr adcl automatic gain control noise gate mode1 avflt srmix_ mode avlg: 0/6/ 12/18db avl:0db to -15db avrg: 0/6/12/18db avr:0db to -15db audio/ voice filters sample rate converter downloaded from: http:///
________________________________________________________________ maxim integrated products 73 MAX98088 stereo audio codec with flexsound technology sidetone enable sidetone during full-duplex operation to add a low-level copy of the recorded audio signal to the play - back audio signal ( figure 14 ). sidetone is commonly used in telephony to allow the speaker to hear himself speak, providing a more natural user experience. the ic implements sidetone digitally. doing so helps prevent unwanted feedback into the playback signal path and better matches the playback audio signal. figure 14. sidetone block diagram table 7. adc record level control register register bit name description 0x33/0x34 5 avlg/avrg left/right adc gain00 = 0db 01 = 6db 10 = 12db 11 = 18db 43 avl/avr left/right adc level value gain (db) value gain (db) 2 0x0 +3 0x8 -5 0x1 +2 0x9 -6 1 0x2 +1 0xa -7 0x3 0 0xb -8 0x4 -1 0xc -9 0 0x5 -2 0xd -10 0x6 -3 0xe -11 0x7 -4 0xf -12 dsts sidetone dvst:0db to -60db automatic gain control eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dacr + noise gate mode1 avflt srmix_ mode avlg: 0/6/ 12/18db avl:0db to -15db avrg: 0/6/12/18db avr:0db to -15db audio/ voice filters audio/ filters audio/ voice filters mix mix mixdal mix adren adlen adcr adcl sample rate converter downloaded from: http:///
________________________________________________________________ maxim integrated products 74 MAX98088 stereo audio codec with flexsound technology table 8. sidetone register digital audio interfaces the ic includes two separate playback signal paths and one record signal path. digital audio interface 1 (dai1) is used to transmit the recorded stereo audio signal and receive a stereo audio signal for playback. digital audio interface 2 (dai2) is used to receive a second stereo audio signal. use dai1 for all full-duplex operations and for all voice signals. use dai2 for music and to mix two playback audio signals. the digital audio interfaces are separate from the audio ports to enable either interface to communicate with any external device connected to either audio port. each audio interface can be configured in a variety of for - mats including left justified, i 2 s, pcm, and time division multiplexed (tdm). tdm mode supports up to 4 mono audio slots in each frame. the ic can use up to 2 mono slots per interface, leaving the remaining two slots avail - able for another device. table 9 shows how to configure the device for common digital audio formats. figures 16 and 17 show examples of common audio formats. by default, sdouts1 and sdouts2 are set high imped - ance when the ic is not outputting data to facilitate shar - ing the bus. configure the interface in tdm mode using only slot 1 to transmit and receive mono pcm voice data. the ic?s digital audio interfaces support both adc to dac loop-through and digital loopback. loop-through allows the signal converted by the adc to be routed to the dac for playback. the signal is routed from the record path to the playback path in the digital audio interface to allow the ic?s full complement of digital signal processing to be used. loopback allows digital data input to either sdins1 or sdins2 to be routed from one interface to the register bit name description 0x2e 7 dsts sidetone sourceselects which adc output is fed back as sidetone. when mixing the left and right adc outputs, each is attenuated by 6db to prevent full-scale signals from clipping. 00 = sidetone disabled 01 = left adc 10 = right adc 11 = left + right adc 64 dvst sidetone leveladjusts the sidetone signal level. all levels are referenced to the adc?s full-scale output. value level (db) value level (db) 3 0x00 sidetone disabled 0x10 -30.5 0x01 -0.5 0x11 -32.5 0x02 -2.5 0x12 -34.5 0x03 -4.5 0x13 -36.5 2 0x04 -6.5 0x14 -38.5 0x05 -8.5 0x15 -40.5 0x06 -10.5 0x16 -42.5 0x07 -12.5 0x17 -44.5 1 0x08 -14.5 0x18 -46.5 0x09 -16.5 0x19 -48.5 0x0a -18.5 0x1a -50.5 0x0b -20.5 0x1b -52.5 0 0x0c -22.5 0x1c -54.5 0x0d -24.5 0x1d -56.6 0x0e -26.5 0x1e -58.5 0x0f -28.5 0x1f -60.5 downloaded from: http:///
________________________________________________________________ maxim integrated products 75 MAX98088 stereo audio codec with flexsound technology table 9. common digital audio formats other for output on sdouts2 or sdouts1. both inter - faces must be configured for the same sample rate, but the interface format need not be the same. this allows the ic to route audio data from one device to another, converting the data format as needed. figure 15 shows the available digital signal routing options. figure 15. digital audio signal routing mode wci1/wci2 bci1/bci2 dly1/dly2 tdm1/tdm2 slotl1/slotl2 slotr1/slotr2 left justified 1 0 0 0 x x i 2 s 0 0 1 0 x x pcm x 1 x 1 0 0 tdm x 1 x 1 set as desired mas1 dai1 dai1 record path dai1 playback path dai2 playback path sel1 sel2 bclk1 bclks1 lrclk1 sdout1 sdin1 lten1 lben2 + bit clock frame clock data output data input mas1 hizoff1sdoen1 sdien1 sdien2 mas2 dai2 bclk2 lrclk2 sdout2 sdin2 bit clock frame clock data output data input mas2 hizoff2sdoen2 lrclks1 sdouts1 sdins1 dvdds1 bclks2 lrclks2 sdouts2 sdins2 dvdds2 mux lben1 downloaded from: http:///
________________________________________________________________ maxim integrated products 76 MAX98088 stereo audio codec with flexsound technology table 10. digital audio interface registers register bit name description 0x14/0x1c 7 mas1/mas2 dai1/dai2 master modein master mode, dai1/dai2 outputs lrclk and bclk. in slave mode, dai1/dai2 accept lrclk and bclk as inputs. 0 = slave mode 1 = master mode 6 wci1/wci2 dai1/dai2 word clock inverttdm1/tdm2 = 0: 0 = left-channel data is transmitted while lrclk is low. 1 = right-channel data is transmitted while lrclk is low. tdm1/tdm2 = 1: always set wci = 0. 5 bci1/bci2 dai1/dai2 bit clock invertbci1/bci2 must be set to 1 when tdm1/tdm2 = 1. 0 = sdin is accepted on the rising edge of bclk. sdout is valid on the rising edge of bclk. 1 = sdin is accepted on the falling edge of bclk. sdout is valid on the falling edge of bclk. master mode:0 = lrclk transitions on the falling edge of bclk. 1 = lrclk transitions on the rising edge of bclk. 4 dly1/dly2 dai1/dai2 data delaydly1/dly2 has no effect when tdm1/tdm2 = 1. 0 = the most significant data bit is clocked on the first active bclk edge after an lrclk transition. 1 = the most significant data bit is clocked on the second active bclk edge after an lrclk transition. 2 tdm1/tdm2 dai1/dai2 time-division multiplex mode (tdm mode)set tdm1/tdm2 when communicating with devices that use a frame synchronization pulse on lrclk instead of a square wave. 0 = disabled 1 = enabled (bci1/bci2 must be set to 1) 1 fsw1/fsw2 dai1/dai2 wide frame sync pulseincreases the width of the frame sync pulse to the full data width when tdm1/tdm2 = 1. fsw1/fsw2 has no effect when tdm1/tdm2 = 0. 0 = disabled 1 = enabled 0 ws1/ws2 dai1/dai2 audio data bit depthdetermines the maximum bit depth of audio being transmitted and received. data is always 16 bit when tdm1/tmd2 = 0. 0 = 16 bits 1 = 24 bits downloaded from: http:///
________________________________________________________________ maxim integrated products 77 MAX98088 stereo audio codec with flexsound technology table 10. digital audio interface registers (continued) register bit name description 0x15/0x1d 7 osr1 adc oversampling ratiouse the higher setting for maximum performance. use the lower setting for reduced power consumption at the expense of performance. 00 = 96x 01 = 64x 10 = reserved 11 = reserved 65 dac_osr1/ dac_osr2 dac oversample clock. select pclk/2 for higher performance. select pclk/4 for lower consumption.1 = dac input clock = pclk/2 0 = dac input clock = pclk/4 2 bsel1/ bsel2 dai1/dai2 bclk output frequencywhen operating in master mode, bsel1/bsel2 set the frequency of bclk. when operating in slave mode, bsel1/bsel2 have no effect. select the lowest bclk fre - quency that clocks all data input to the dac and output by the adc.000 = bclk disabled 001 = 64 x lrclk 010 = 48 x lrclk 011 = 128 x lrclk (invalid for dhf1/dhf2 = 1) 100 = pclk/2 101 = pclk/4 110 = pclk/8 111 = pclk/16 10 0x16/0x1e 7 sel1/sel2 dai1/dai2 audio port selectorselects which port is used by dai1/dai2. 00 = none 01 = port s1 10 = port s2 11 = reserved 6 5 lten1 dai1 digital loopthroughconnects the output of the record signal path to the input of the playback path. data input to dai1 from an external device is mixed with the recorded audio signal. 0 = disabled 1 = enabled 4 lben1/ lben2 dai1/dai2 digital audio interface loopbacklben1 routes the digital audio input to dai1 back out on dai2. lben2 routes the digi - tal audio input to dai2 back out on dai1. selecting lben2 disables the adc output data. 0 = disabled 1 = enabled 3 dmono1/ dmono2 dai1/dai2 dac mono mixmixes the left and right digital input to mono and routes the combined signal to the left and right playback paths. the left and right input data is attenuated by 6db prior to the mono mix. 0 = disabled 1 = enabled downloaded from: http:///
________________________________________________________________ maxim integrated products 78 MAX98088 stereo audio codec with flexsound technology table 10. digital audio interface registers (continued) register bit name description 0x16/0x1e 2 hizoff1/ hizoff2 disable da1/dai2 output high-impedance modenormally sdout is set high impedance between data words. set hizoff1/hizoff2 to force a level on sdout at all times. 0 = disabled 1 = enabled 1 sdoen1/ sdoen2 dai1/dai2 record path output enabledai2 outputs data only if lben1 = 1. 0 = disabled 1 = enabled 0 sdien1/ sdien2 dai1/dai2 playback path input enable0 = disabled 1 = enabled 0x17/0x1f 7 slotl1/ slotl2 tdm left time slotselects which of the four slots is used for left data on dai1/dai2. if the same slot is selected for left and right audio, left audio is placed in the slot. 00 = slot 1 01 = slot 2 10 = slot 3 11 = slot 4 65 slotr1/ slotr2 tdm right time slotselects which of the four slots is used for right data on dai1/dai2. if the same slot is selected for left and right audio, left audio is placed in the slot. 00 = slot 1 01 = slot 2 10 = slot 3 11 = slot 4 43 slotdly1/ slotdly2 tdm slot delayadds 1 bclk cycle delay to the data in the specified tdm slot. 1xxx = slot 4 delayed x1xx = slot 3 delayed xx1x = slot 2 delayed xxx1 = slot 1 delayed 21 0 downloaded from: http:///
________________________________________________________________ maxim integrated products 79 MAX98088 stereo audio codec with flexsound technology figure 16. non-tdm data format examples wc i_ = 0, bc i_ = 0, dly_ = 0, td m_ = 0, fs w_ = 0, ws _ = 0, hi zoff _ = 1, sl ot l_ = 0, sl ot r_ = 0 l rcl k leftleft left bclk sdout d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 ri gh t ri gh t ri gh t s din wc i_ = 1, bc i_ = 0, dly_ = 0, td m_ = 0, fs w_ = 0, ws _ = 0, hi zoff _ = 1, sl ot l_ = 0, sl ot r_ = 0 l rcl k bclk sdout s din l rcl k bclk sdout s din wc i_ = 0, bc i_ = 1, dly_ = 0, td m_ = 0, fs w_ = 0, ws _ = 0, hi zoff _ = 1, sl ot l_ = 0, sl ot r_ = 0 wc i_ = 0, bc i_ = 0, dly_ = 1, td m_ = 0, fs w_ = 0, ws _ = 0, hi zoff _ = 1, sl ot l_ = 0, sl ot r_ = 0 l rcl k bclk sdout ri gh t le ft s din downloaded from: http:///
________________________________________________________________ maxim integrated products 80 MAX98088 stereo audio codec with flexsound technology figure 17. tdm mode data format examples lrcl k bclk sdout sdin l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 wci_ = 0, bci_ = 1, dly_ = 0, tdm_ = 1, fsw_ = 0, ws_ = 0, hizoff_ = 0, slotl_ = 0, slotr_ = 1 l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 hi-z hi-z lrclk bclk sdout sdin lrclk bclk sdout sdin lrclk bclk sdout sdin lrcl k bclk sdout sdin l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 wci_ = 0, bci_ = 1, dly_ = 0, tdm_ = 1, fsw_ = 1, ws_ = 0, hizoff_ = 0, slotl_ = 0, slotr_ = 1 l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 hi-z hi-z l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 wci_ = 0, bci_ = 1, dly_ = 0, tdm_ = 1, fsw_ = 0, ws_ = 0, hizoff_ = 1, slotl_ = 0, slotr_ = 1 wci_ = 0, bci_ = 1, dly_ = 0, tdm_ = 1, fsw_ = 0, ws_ = 0, hizoff_ = 0, slotl_ = 2, slotr_ = 3 l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 hi-z hi-z l15 l14 l13 l12 l11 l10 l9 l8 l7 l6 l5 l4 l3 l2 l1 l0 r15 r14 r13 r12 r11 r10 r9 r8 r7 r6 r5 r4 r3 r2 r1 r0 32 cycles l l l l l l l l r r r r r r r r hi-z l l l l l l l l r r r r r r r r hi-z hi-z 16 cycles 16 cycles 16 cycles 16 cycles wci_ = 0, bci_ = 1, dly_ = 0, tdm_ = 1, fsw_ = 0, ws_ = 0, hizoff_ = 0, slotl_ = 0, slotr_ = 1 downloaded from: http:///
________________________________________________________________ maxim integrated products 81 MAX98088 stereo audio codec with flexsound technology clock control the digital signal paths in the ic require a master clock (mclk) between 10mhz and 60mhz to function. the MAX98088 requires an internal clock between 10mhz and 20mhz. a prescaler divides mclk by 1, 2, or 4 to create the internal clock (pclk). pclk is used to clock all portions of the ic. the MAX98088 includes two digital audio signal paths, both capable of supporting any sample rate from 8khz to 96khz. each path is independently configured to allow different sample rates. to accommodate a wide range of system architectures, four main clocking modes are supported: u pll mode: when operating in slave mode, enable the pll to lock onto any lrclk input. this mode requires the least configuration, but provides the lowest per - formance. use this mode to simplify initial setup or when normal mode and exact integer mode cannot be used. u normal mode: this mode uses a 15-bit clock divider to set the sample rate relative to pclk. this allows high flexibility in both the pclk and lrclk frequen - cies and can be used in either master or slave mode. u exact integer mode (dai1 only): in both master and slave modes, common mclk frequencies (12mhz, 13mhz, 16mhz, and 19.2mhz) can be programmed to operate in exact integer mode for both 8khz and 16khz sample rates. in these modes, the mclk and lrclk rates are selected by using the freq1 bits instead of the ni, and pll control bits. u dac low-power mode: this mode bypasses the pll for reduce power consumptions and uses fixed counters to generate the clocks. the dai__dac_lp bits override the other clock settings. table 11. clock control registers register bit name description 0x10 5 psclk mclk prescalergenerates pclk, which is used by all internal circuitry. 00 = pclk disabled 01 = 10mhz p mclk p 20mhz (pclk = mclk) 10 = 20mhz p mclk p 40mhz (pclk = mclk/2) 11 = 40mhz p mclk p 60mhz (pclk = mclk/4) 4 0x11/0x19 7 sr1/sr2 dai1/dai2 sample rateused by the alc to correctly set the dual-band crossover frequency and the excursion limiter to set the predefined corner frequencies. 6 value sample rate (khz) value sample rate (khz) 0x0 reserved 0x8 48 5 0x1 8 0x9 88.2 0x2 11.025 0xa 96 0x3 16 0xb reserved 0x4 22.05 0xc reserved 4 0x5 24 0xd reserved 0x6 32 0xe reserved 0x7 44.1 0xf reserved downloaded from: http:///
________________________________________________________________ maxim integrated products 82 MAX98088 stereo audio codec with flexsound technology table 11. clock control registers (continued) register bit name description 0x11 3 freq1 exact integer modeoverrides pll1 and ni1 and configures a specific pclk to lrclk ratio. value sample rate value sample rate 0x0 disabled 0x8 pclk = 12mhz, lrclk = 8khz 2 0x1 reserved 0x9 pclk = 12mhz, lrclk = 16khz 0x2 reserved 0xa pclk = 13mhz, lrclk = 8khz 0x3 reserved 0xb pclk = 13mhz, lrclk = 16khz 0x4 reserved 0xc pclk = 16mhz, lrclk = 8khz 1 0x5 reserved 0xd pclk = 16mhz, lrclk = 16khz 0x6 reserved 0xe pclk = 19.2mhz, lrclk = 8khz 0x7 reserved 0xf pclk = 19.2mhz, lrclk = 16khz 0x12/0x1a 7 pll1/pll2 pll mode enable (slave mode only)pll1/pll2 enables a digital pll that locks on to the externally supplied lrclk frequency and automatically sets the lrclk divider (ni1/ni2). 0 = disabled 1 = enabled 6 ni1/ ni2 normal mode lrclk dividerwhen pll1/pll2 = 0, the frequency of lrclk is determined by ni1/ni2. see table 12 for common ni values. 54 3 sample rate dhf1/dhf2 ni1/ni2 formula 21 8khz p lrclk p 48khz 0 0 0x13/0x1b 7 48khz < lrclk p 96khz 1 65 4 3 f lrclk = lrclk frequency f pclk = prescaled mclk frequency (pclk) 21 0 ni1[0]/ni2[0] rapid lock modeprogram ni1/ni2 to the nearest valid ratio and set ni1[0]/ni2[0] when pll1/pll2 = 1 to enable rapid lock mode. normally, the pll automatically calculates and dynamically adjusts ni1/ni2. when rapid lock mode is properly configured, the pll starting point is much closer to the correct value, thus speeding up lock time. wait one lrclk period after programming ni1/ni2 before setting pll1/pll2 = 1. downloaded from: http:///
________________________________________________________________ maxim integrated products 83 MAX98088 stereo audio codec with flexsound technology table 11. clock control registers (continued) register bit name description 0x4f 7 dai2_dac_lp dai_ dac low power select.these bits setup the clocks to be generated from fixed counters that bypass the pll for dac low power mode. 6 value setting filter select value setting filter select 0x0 pll derived clock ? 0x8 pclk = 2304 x lrclk voice 5 0x1 pclk = 128 x lrclk audio 96khz 0x9 reserved ? 4 0x2 pclk = 192 x lrclk audio 96khz 0xa reserved ? 3 dai1_dac_lp 0x3 pclk = 256 x lrclk audio 48khz 0xb reserved ? 0x4 pclk = 384 x lrclk audio 48khz 0xc reserved ? 2 0x5 pclk = 768 x lrclk voice 0xd reserved ? 1 0x6 pclk = 1152 x lrclk voice 0xe reserved ? 0 0x7 pclk = 1536 x lrclk voice 0xf reserved ? 0x50 3 dac2dithen dai2 dac input dither enabledac2dithen is recommended to be set when dai2_dac_lp = 0000. 0 = disabled 1 = enabled 2 dac1dithen dai1 dac input dither 1 enabledac1dithen is recommended to be set when dai1_dac_lp = 0000. 0 = disabled 1 = enabled 1 cgm2_en dai2 clock gen module enablecgm1_en has to be set along with cgm2_en to enable the clock generation for the dai2 dac playback path. 0 = disabled 1 = enabled 0 cgm1_en dai1/device clock gen module enablecgm1_en enables the device clock generation, and needs to be set for dac playback or adc record. 0 = disabled 1 = enabled downloaded from: http:///
________________________________________________________________ maxim integrated products 84 MAX98088 stereo audio codec with flexsound technology sample rate converter the sample rate conversion scheme enables the mix - ing of asynchronous audio data from the digital audio interfaces (sdin1/sdin2), and for the resulting mixed audio to output on either audio interface through sdout1 or sdout2. table 12. common ni1/ni2 valuesnote: values in bold are exact integers that provide maximum full-scale performance. figure 18. sample rate converter pclk (mhz) lrclk (khz) dhf1/2 = 0 dhf1/2 = 1 8 11.025 12 16 22.05 24 32 44.1 48 64 88.2 96 10 13a9 1b18 1d7e 2752 3631 3afb 4ea5 6c61 75f7 4ea5 6c61 75f7 11 11e0 18a2 1acf 23bf 3144 359f 477e 6287 6b3e 477e 6287 6b3e 11.2896 116a 1800 1a1f 22d4 3000 343f 45a9 6000 687d 45a9 6000 687d 12 1062 1694 1893 20c5 2d29 3127 4189 5a51 624e 4189 5a51 624e 12.288 1000 160d 1800 2000 2c1a 3000 4000 5833 6000 4000 5833 6000 13 0f20 14d8 16af 1e3f 29af 2d5f 3c7f 535f 5abe 3c7f 535f 5abe 16 0c4a 10ef 126f 1893 21de 24dd 3127 43bd 49ba 3127 43bd 49ba 16.9344 0b9c 1000 116a 1738 2000 22d4 2e71 4000 45a9 2e71 4000 45a9 18.432 0aab 0eb3 1000 1555 1d66 2000 2aab 3acd 4000 2aab 3acd 4000 20 09d5 0d8c 0ebf 13a9 1b18 1d7e 2752 3631 3afb 2752 3631 3afb dsts sidetone dvst:0db to -60db automatic gain control eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dacr + noise gate mode1 avflt srmix_ mode avlg: 0/6/ 12/18db avl:0db to -15db avrg: 0/6/12/18db avr:0db to -15db audio/ voice filters audio/ filters audio/ voice filters mix mix mixdal mix adren adlen adcr adcl sample rate converter downloaded from: http:///
________________________________________________________________ maxim integrated products 85 MAX98088 stereo audio codec with flexsound technology passband filtering each digital signal path in the ic includes options for defining the path bandwidth ( figure 19 ). the playback and record paths connected to dai1 support both voice and music filtering while the playback path connected to dai2 supports music filtering only. the voice iir filters provide greater than 70db stopband attenuation at frequencies above f s /2 to reduce aliasing. three selectable highpass filters eliminate unwanted low-frequency signals. use music mode when processing high-fidelity audio content. the music fir filters reduce power consump - tion and are linear phase to maintain stereo imaging. an optional dc-blocking filter is available to eliminate unwanted dc offset. in music mode, a second set of fir filters are available to support sample rates greater than 50khz. the filters can be independently selected for dai1 and dai2 and sup - port both the playback and record audio paths. table 13. sample rate converter figure 19. digital passband filtering block diagram register bit name description 0x21 4 srmix_mode sample rate mix mode. sets mixing configuration applied to the sample rate con - verted channel(s).0 = (dai1 + dai2) 1 = (dai1 + dai2)/2 3 srmix_enl sample rate mix enable. if enabled, mixes data on dai1 and dai2. if cleared, scr data source is dai2 only.0 = src mix disable 1 = src mix enable 2 srmix_enr 1 src_enl sample rate converter enable. select if the src is enabled on per channel basis. 0 = sample rate converter disable1 = sample rate converter enable 0 src_enr dsts sidetone dvst:0db to -60db automatic gain control eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dacr + noise gate mode1 avflt srmix_ mode avlg: 0/6/ 12/18db avl:0db to -15db avrg: 0/6/12/18db avr:0db to -15db audio/ voice filters audio/ filters audio/ voice filters mix mix mixdal mix adren adlen adcr adcl sample rate converter downloaded from: http:///
________________________________________________________________ maxim integrated products 86 MAX98088 stereo audio codec with flexsound technology table 14. passband filtering registers register bit name description 0x18 7 mode1 dai1 passband filtering mode0 = voice filters 1 = music filters (recommended for f s > 24khz) 6 avflt1 dai1 adc highpass filter mode 5 mode1 avflt1 4 0 see table 15 1 select a nonzero value to enable the dc-blocking filter. 3 dhf1 dai1 high sample rate modeselects the sample rate range. 0 = 8khz p lrclk p 48khz 1 = 48khz p lrclk p 96khz 2 dvflt1 dai1 dac highpass filter mode 1 mode1 dvflt1 0 see table 15 0 1 select a nonzero value to enable the dc-blocking filter. 0x20 3 dhf2 dai2 high sample rate modeselects the sample rate range. 0 = 8khz p lrclk p 48khz 1 = 48khz < lrclk p 96khz 0 dcb2 dai2 dc blocking filterenables a dc-blocking filter on the dai2 playback audio path. 0 = disabled 1 = enabled downloaded from: http:///
________________________________________________________________ maxim integrated products 87 MAX98088 stereo audio codec with flexsound technology table 15. voice highpass filters avftl/dvflt value intended sample rate filter response 000 n/a disabled 001/011 16khz/8khz 010/100 16khz/8khz 101 8khz to 48khz 110/111 n/a reserved frequency (hz) amplitude (db) 800 600 400 200 -50 -40 -30 -20 -10 0 -60 0 1000 frequency (hz) amplitude (db) 800 600 400 200 -50 -40 -30 -20 -10 0 -60 0 1000 frequency (hz) amplitude (db) 800 600 400 200 -50 -40 -30 -20 -10 0 -60 0 1000 lrclk = 48khz downloaded from: http:///
________________________________________________________________ maxim integrated products 88 MAX98088 stereo audio codec with flexsound technology playback path signal processing the ic playback signal path includes automatic level control (alc) and a 5-band parametric equalizer (eq) ( figure 20 ). the dai1 and dai2 playback paths include separate alcs controlled by a single set of registers. two completely separate parametric eqs are included for the dai1 and dai2 playback paths. automatic level control the automatic level control (alc) circuit ensures maxi - mum signal amplitude without producing audible clip - ping. this is accomplished by a variable gain stage that works on a sample by sample basis to increase the gain up to 12db. a look-ahead circuit determines if the next sample exceeds full scale and reduces the gain so that the sample is exactly full scale. a programmable low signal threshold determines the minimum signal amplitude that is amplified. select a threshold that prevents the amplification of background noise. when the signal level drops below the low signal threshold, the alc reduces the gain to 0db until the sig - nal increases above the threshold. figure 21 shows an example of alc input vs. output curves. the alc can optionally be configured in dual-band mode. in this mode, the input signal is filtered into two bands with a 5khz center frequency. each band is routed through independent alcs and then summed together. in multiband mode, both bands use the same parameters. figure 21. alc input vs. output examples figure 20. playback path signal processing block diagram 0 ou tput si gnal (d bf s) ou tput si gnal (d bf s) ou tput si gnal (d bf s) inputsi gnal (d bf s) inputsi gnal (d bf s) inputsi gnal (d bf s) low -lev el th re s hol d -1 20 low -lev el th re s hol d -1 20 low -lev el th re s hol d -1 20 0 0 al c wi th al cth 000 al c wi th al cth = 00 0 al c di s abled eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dacr + audio/ filters audio/ voice filters mix mixdal mix downloaded from: http:///
________________________________________________________________ maxim integrated products 89 MAX98088 stereo audio codec with flexsound technology parametric equalizer the parametric eq contains five independent biquad filters with programmable gain, center frequency, and bandwidth. each biquad filter has a gain range of q 12db and a center frequency range from 20hz to 20khz. use a filter q less than that shown in figure 22 to achieve ideal frequency responses. setting a higher q results in non- ideal frequency response. the biquad filters are series connected, allowing a total gain of q 60db. table 16. automatic level control registers figure 22. maximum recommended filter q vs. frequency register bit name description 0x43 7 alcen alc enableenables alc on both the dai1 and dai2 playback paths. 0 = disabled 1 = enabled 6 alcrls alc and excursion limiter release timesets the release time for both the alc and excursion limiter. see the excursion limiter section for excursion limiter release times. alc release time is defined as the time required to adjust the gain from 12db to 0db. value alc release time (s) 5 000 8 001 4 010 2 011 1 4 100 0.5 101 0.25 110 reserved 111 reserved 3 alcmb multiband enableenables dual-band processing with a 5khz center frequency. sr1 and sr2 must be configured properly to achieve the correct center frequency for each playback path. 0 = single-band alc 1 = dual-band alc 2 alcth low signal thresholdselects the minimum signal level to be boosted by the alc. 000 = - j db (low-signal threshold disabled) 001 = -12db010 = -18db 011 = -24db 100 = -30db 101 = -36db 110 = -42db 111 = -48db 10 center frequency (hz) maximum recommended filter q 10,000 1000 1 10 100 1000 0.1 100 100,000 f s = 8khz f s = 48khz f s = 96khz downloaded from: http:///
________________________________________________________________ maxim integrated products 90 MAX98088 stereo audio codec with flexsound technology use the attenuator at the eq?s input to avoid clipping the signal. the attenuator can be programmed for fixed attenuation or dynamic attenuation based on signal level. if the dynamic eq clip detection is enabled, the signal level from the eq is fed back to the attenuator circuit to determine the amount of gain reduction necessary to avoid clipping. the MAX98088 ev kit software includes a graphical inter - face for generating the eq coefficients. the coefficients are sample rate dependent and stored in registers 0x52 through 0xb5. table 17. eq registers register bit name description 0x30/0x32 4 eqclp1 / eqclp2 dai1/dai2 eq clip detectionautomatically controls the eq attenuator to prevent clipping in the eq. 0 = enabled 1 = disabled 3 dveq1/dveq2 dai1/dai2 eq attenuatorprovides attenuation to prevent clipping in the eq when full-scale signals are boost - ed. dveq1/dveq2 operates only when eq1en/eq2en = 1 and eqclp1 / eqclp2 = 1. 2 value gain (db) value gain (db) 0x0 0 0x8 -8 0x1 -1 0x9 -9 1 0x2 -2 0xa -10 0x3 -3 0xb -11 0x4 -4 0xc -12 0 0x5 -5 0xd -13 0x6 -6 0xe -14 0x7 -7 0xf -15 0x49 7 vs2en see the click-and-pop reduction section. 6 vsen 5 zden 1 eq2en dai2 eq enable0 = disabled 1 = enabled 0 eq1en dai1 eq enable0 = disabled 1 = enabled downloaded from: http:///
________________________________________________________________ maxim integrated products 91 MAX98088 stereo audio codec with flexsound technology playback level control the ic includes separate digital level control for the dai1 and dai2 playback audio paths. the dai1 signal path allows boost when mode1 = 0 and attenuation in any mode. the dai2 signal path allows attenuation only. figure 23. playback level control block diagram table 18. dac playback level control register register bit name description 0x2f/0x31 7 dv1m/dv2m dai1/dai2 mute0 = disabled 1 = enabled 5 dv1g dai1 voice mode gaindv1g only applies when mode1 = 0. 00 = 0db 01 = 6db 10 = 12db 11 = 18db 43 dv1/dv2 dai1/dai2 attenuation value gain (db) value gain (db) 2 0x0 0 0x8 -8 0x1 -1 0x9 -9 0x2 -2 0xa -10 1 0x3 -3 0xb -11 0x4 -4 0xc -12 0x5 -5 0xd -13 0 0x6 -6 0xe -14 0x7 -7 0xf -15 eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dacr + audio/ filters audio/ voice filters mix mixdal mix downloaded from: http:///
________________________________________________________________ maxim integrated products 92 MAX98088 stereo audio codec with flexsound technology dac input mixers the ic?s stereo dac accepts input from two digital audio paths. the dac mixer routes any audio path to the left and right dacs ( figure 24 ). figure 24. dac input mixer block diagram table 19. dac input mixer register register bit name description 0x22 7 mixdal left dac input mixer1xxx = dai1 left channel x1xx = dai1 right channel xx1x = dai2 left channel xxx1 = dai2 right channel 65 4 3 mixdar right dac input mixer1xxx = dai1 left channel x1xx = dai1 right channel xx1x = dai2 left channel xxx1 = dai2 right channel 21 0 eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dacr + audio/ filters audio/ voice filters mix mixdal mix downloaded from: http:///
________________________________________________________________ maxim integrated products 93 MAX98088 stereo audio codec with flexsound technology receiver amplifier the ic includes a single differential receiver amplifier. the receiver amplifier is designed to drive a 32 i earpiece speaker. in cases where a single transducer is used for the loudspeaker and receiver, use the spkbyp switch to route the receiver amplifier output to the left speaker outputs. the receiver amplifier can also be configured as stereo single- ended line outputs using the i 2 c interface. figure 25. receiver amplifier block diagram dalen dacl daren dacr mixrecr mix mixrecl mix 0db 0db recvoll:+8db to -62db reclenrecren recvolr:+8db to -62db recbyp spkbyp recp/ loutl/ rxinp recn/ loutr/ rxinn spklp spkln linemode splen +6db downloaded from: http:///
________________________________________________________________ maxim integrated products 94 MAX98088 stereo audio codec with flexsound technology receiver output mixer the ic?s receiver amplifier accepts input from the stereo dac, the line inputs (single-ended or differential), and the mic inputs. configure the mixer to mix any combination of the available sources. when more than one signal is selected, the mixed signal can be configured to attenuate 6db, 9db, or 12db. table 20. receiver output mixer register register bit name description 0x28 7 mixrecl left receiver output mixer1xxxxxxx = right dac x1xxxxxx = mic2 xx1xxxxx = mic1 xxx1xxxx = inb2 (inbdiff = 0) or inb2-inb1 (inbdiff = 1) xxxx1xxx = inb1 xxxxx1xx = ina2 (inadiff = 0) or ina2-ina1 (inadiff = 1) xxxxxx1x = ina1 xxxxxxx1 = left dac 65 4 3 2 1 0 0x29 7 mixrecr right receiver output mixer1xxxxxxx = left dac x1xxxxxx = mic2 xx1xxxxx = mic1 xxx1xxxx = inb2 (inbdiff = 0) or inb2-inb1 (inbdiff = 1) xxxx1xxx = inb1 xxxxx1xx = ina2 (inadiff = 0) or ina2-ina1 (inadiff = 1) xxxxxx1x = ina1 xxxxxxx1 = right dac 65 4 3 2 1 0 0x2a 7 line_mode receiver output mode . configures receive path output mode between btl and ste - reo line output.0 = btl 1 = stereo line output 3 mixrecr _gain right receiver mixer gain select00 = 0db 01 = -6db 10 = -9db 11 = -12db 21 mixrecl _gain left receiver mixer gain select00 = 0db 01 = -6db 10 = -9db 11 = -12db 00 downloaded from: http:///
________________________________________________________________ maxim integrated products 95 MAX98088 stereo audio codec with flexsound technology table 21. receiver output level register receiver output volume register bit name description 0x3b/0x3c 7 reclm/ recrm receiver output mute0 = disabled 1 = enabled 4 recvoll/ recvolr receiver output volume level value volume (db) value volume (db) 3 0x00 -62 0x10 -10 0x01 -58 0x11 -8 0x02 -54 0x12 -6 0x03 -50 0x13 -4 2 0x04 -46 0x14 -2 0x05 -42 0x15 0 0x06 -38 0x16 +1 0x07 -35 0x17 +2 1 0x08 -32 0x18 +3 0x09 -29 0x19 +4 0x0a -26 0x1a +5 0x0b -23 0x1b +6 0 0x0c -20 0x1c +6.5 0x0d -17 0x1d +7 0x0e -14 0x1e +7.5 0x0f -12 0x1f +8 downloaded from: http:///
________________________________________________________________ maxim integrated products 96 MAX98088 stereo audio codec with flexsound technology speaker amplifiers the ic integrates a stereo filterless class d amplifier that offers much higher efficiency than class ab without the typical disadvantages. the high efficiency of a class d amplifier is due to the switching operation of the output stage transistors. in a class d amplifier, the output transistors act as current steering switches and consume negligible additional power. any power loss associated with the class d out - put stage is mostly due to the i 2 r loss of the mosfet on-resistance, and quiescent current overhead. the theoretical best efficiency of a linear amplifier is 78%, however, that efficiency is only exhibited at peak output power. under normal operating levels (typical music reproduction levels), efficiency falls below 30%, whereas the ic?s class d amplifier still exhibits 80% efficiency under the same conditions. traditional class d amplifiers require the use of exter - nal lc filters or shielding to meet en55022b and fcc electromagnetic-interference (emi) regulation standards. maxim?s patented active emissions limiting edge-rate control circuitry reduces emi emissions, allowing opera - tion without any output filtering in typical applications. figure 26. speaker amplifier path block diagram dalen dacl daren dacr mixspr mix mixspl mix spklp spkln spvoll:+8db to -62db spklvdd spklgndspkrvdd spkrp spkrn splenspren po we r/ di st or ti on li mi te r spvolr:+8db to -62db spkrgnd +6db +6db downloaded from: http:///
________________________________________________________________ maxim integrated products 97 MAX98088 stereo audio codec with flexsound technology speaker output mixers the ic?s speaker amplifiers accept input from the stereo dac, the line inputs (single-ended ore differential), and the mic inputs. configure the mixer to mix any combination of the available sources. when more than one signal is selected, the mixer can be configured to attenuate the signal by 6db, 9db or 12db. table 22. speaker output mixer register register bit name description 0x2b 7 mixspl left speaker output mixer1xxxxxxx = right dac x1xxxxxx = mic2 xx1xxxxx = mic1 xxx1xxxx = inb2 (inbdiff = 0) or inb2-inb1 (inbdiff = 1) xxxx1xxx = inb1 xxxxx1xx = ina2 (inadiff = 0) or ina2-ina1 (inadiff = 1) xxxxxx1x = ina1 xxxxxxx1 = left dac 65 4 3 2 1 0 0x2c 7 mixspr right speaker output mixer1xxxxxxx = left dac x1xxxxxx = mic2 xx1xxxxx = mic1 xxx1xxxx = inb2 (inbdiff = 0) or inb2-inb1 (inbdiff = 1) xxxx1xxx = inb1 xxxxx1xx = ina2 (inadiff = 0) or ina2-ina1 (inadiff = 1) xxxxxx1x = ina1 xxxxxxx1 = right dac 65 4 3 2 1 0 0x2d 3 mixspr _gain right speaker mixer gain select00 = 0db 01 = -6db 10 = -9db 11 = -12db 21 mixspl _gain left speaker mixer gain select00 = 0db 01 = -6db 10 = -9db 11 = -12db 0 downloaded from: http:///
________________________________________________________________ maxim integrated products 98 MAX98088 stereo audio codec with flexsound technology table 23. speaker output level register speaker output volume speaker amplifier signal processing the ic includes signal processing to improve the sound quality of the speaker output and protect transducers from damage. an excursion limiter dynamically adjusts the highpass corner frequency, while a power limiter and distortion limiter prevent the amplifier from outputting too much distortion or power. the excursion limiter is located in the dsp while the distortion limiter and power limiter control the analog volume control ( figure 28 ). all three limiters analyze the speaker amplifier?s output signal to determine when to take action. excursion limiter the excursion limiter is a dynamic highpass filter that monitors the speaker outputs and increases the highpass corner frequency when the speaker amplifier?s output exceeds a predefined threshold. the filter smoothly transitions between the high and low corner frequency to prevent unwanted artifacts. the filter can operate in four different modes: u fixed-frequency preset mode. the highpass corner frequency is fixed at the upper corner frequency and does not change with signal level. u fixed-frequency programmable mode. the high - pass corner frequency is fixed to that specified by the programmable biquad filter. u preset dynamic mode. the highpass filter automati - cally slides between a preset upper and lower corner frequency based on output signal level. u user-programmable dynamic mode. the highpass filter slides between a user-programmed biquad filter on the low side to a predefined corner frequency on the high side. register bit name description 0x3d/0x3e 7 splm/sprm left/right speaker output mute0 = disabled 1 = enabled 4 spvoll/spvolr left/right speaker output volume level value volume (db) value volume (db) 0x00 -62 0x10 -10 0x01 -58 0x11 -8 3 0x02 -54 0x12 -6 0x03 -50 0x13 -4 0x04 -46 0x14 -2 0x05 -42 0x15 0 0x06 -38 0x16 +1 0x07 -35 0x17 +2 2 0x08 -32 0x18 +3 0x09 -29 0x19 +4 0x0a -26 0x1a +5 0x0b -23 0x1b +6 1 0x0c -20 0x1c +6.5 0x0d -17 0x1d +7 0x0e -14 0x1e +7.5 0x0f -12 0x1f +8 downloaded from: http:///
________________________________________________________________ maxim integrated products 99 MAX98088 stereo audio codec with flexsound technology the transfer function for the user-programmable biquad is: -1 -2 01 2 -1 -2 12 b bz b z h(z) 1 az a z ++ = ++ the coefficients b 0 , b 1 , b 2 , a 1 , and a 2 are sample rate dependent and stored in registers 0xb4 through 0xc7. store b 0 , b 1 , and b 2 as positive numbers. store a 1 and a 2 as negated two?s complement numbers. separate filters can be stored for the dai1 and dai2 playback paths. the MAX98088 ev kit software includes a graphic interface for generating the user-programmable biquad coefficients. note: only change the excursion limiter settings when the signal path is disabled to prevent undesired artifacts. figure 27. speaker amplifier signal processing block diagram eq1e ne q2en dveq1:0db to -15db dv1g:0/6/12/18db dv2:0db to -15db dcb2 5-band parametric eq 5-band parametric eq dveq2:0db to -15db multi band alc excursion limiter dv1:0db to -15db mode1dvflt dalen mixdar dacl daren dacr + audio/ filters audio/ voice filters mix mixdal mix mixspr mix mixspl mix spklp spkln spvoll:+8db to -62db spklvdd spklgndspkrvdd spkrp spkrn splenspren po we r/ di st or ti on li mi te r spvolr:+8db to -62db spkrgnd +6db +6db downloaded from: http:///
_______________________________________________________________ maxim integrated products 100 MAX98088 stereo audio codec with flexsound technology table 24. excursion limiter registers register bit name description 0x41 6 dhpucf excursion limiter corner frequencythe excursion limiter has limited sliding range and minimum corner frequencies. listed below are all the valid filter combinations. 5 lower corner frequency upper corner frequency minimum biquad corner frequency dhpucf dhplcf excursion limiter disabled ? 000 00 4 400hz ? 001 00 600hz ? 010 00 800hz ? 011 00 1khz ? 100 00 1 dhplcf programmable using biquad 100hz 000 11 200hz 400hz ? 001 01 400hz 600hz ? 010 10 400hz 800hz ? 011 10 0 programmable using biquad 400hz 200hz 001 11 programmable using biquad 600hz 300hz 010 11 programmable using biquad 800hz 400hz 011 11 programmable using biquad 1khz 500hz 100 11 0x43 6 alcrls alc and excursion limiter release timesets the release time for both the alc and excursion limiter. see the automatic level control section for alc release times. excursion limiter release time is defined as the time required to slide from the high corner frequency to the low corner frequency. value excursion limiter release time (s) 5 000 4 001 2 010 1 011 0.5 4 100 0.25 101 0.25 110 reserved 111 reserved 0x42 3 dhpth excursion limiter thresholdmeasured at the class d speaker amplifier outputs. signals above the threshold use the upper corner frequency. signals below the threshold use the lower corner fre - quency. v bat must correctly reflect the voltage of spklvdd to achieve accurate thresholds.000 = 0.34v p 001 = 0.71v p 010 = 1.30v p 011 = 1.77v p 100 = 2.33v p 101 = 3.25v p 110 = 4.25v p 111 = 4.95v p 21 0 downloaded from: http:///
_______________________________________________________________ maxim integrated products 101 MAX98088 stereo audio codec with flexsound technology power limiter the ic?s power limiter tracks the continuous power deliv - ered to the loudspeaker and briefly mutes the speaker amplifier output if the speaker is at risk of sustaining permanent damage. loudspeakers are typically damaged when the voice coil overheats due to extended operation above the rated power. during normal operation, heat generated in the voice coil is transferred to the speaker?s magnet, which transfers heat to the surrounding air. for the voice coil to overheat, both the voice coil and the magnet must overheat. the result is that a loudspeaker can operate above its rated power for a significant time before it heats sufficiently to cause damage. the ic?s power limiter includes user-programmable time constants and power thresholds to match a wide range of loudspeakers. program the power limiter?s threshold to match the loudspeaker?s rated power handling. this can be determined through measurement or the loudspeak - er?s specification. program time constant 1 to match the voice coil?s thermal time constant. program time constant 2 to match the magnet?s thermal time constant. the time constants can be determined by plotting the voice coil?s resistance vs. time as power is applied to the speaker. table 25. power limiter registers register bit name description 0x44 7 pwrth power limiter thresholdif the continuous output power from the speaker amplifiers exceeds this threshold, the output is briefly muted to protect the speaker. the threshold is measured in watts assuming an 8 i load. vbat must correctly reflect the voltage of spklvdd/ spkrvdd to achieve accurate thresholds. 6 value threshold (w) value threshold (w) 0x0 power limiter disabled 0x8 0.27 5 0x1 0.05 0x9 0.35 0x2 0.06 0xa 0.48 0x3 0.09 0xb 0.72 0x4 0.11 0xc 1.00 4 0x5 0.13 0xd 1.43 0x6 0.18 0xe 1.57 0x7 0.22 0xf 1.80 2 pwrk power limiter weighting factordetermines the balance between time constant 1 and 2 to match the dominance of each time constant in the loudspeaker. 1 value t1 (%) t2 (%) 000 50 50 001 62.5 37.5 010 75 25 011 87.5 12.5 0 100 100 0 101 12.5 87.5 110 25 75 111 37.5 62.5 downloaded from: http:///
_______________________________________________________________ maxim integrated products 102 MAX98088 stereo audio codec with flexsound technology table 25. power limiter registers (continued) distortion limiter the ic?s distortion limiter ensures that the speaker amplifier?s output does not exceed the programmed thd+n limit. the distortion limiter analyzes the class d output duty cycle to determine the percentage of the waveform that is clipped. if the distortion exceeds the programmed threshold, the output gain is reduced. register bit name description 0x45 7 pwrt2 power limiter time constant 2select a value that matches the thermal time constant of the loudspeaker?s magnet. 6 value time constant (min) value time constant (min) 0x0 disabled 0x8 3.75 0x1 0.50 0x9 5.00 5 0x2 0.67 0xa 6.66 0x3 0.89 0xb 8.88 0x4 1.19 0xc reserved 4 0x5 1.58 0xd reserved 0x6 2.11 0xe reserved 0x7 2.81 0xf reserved 3 pwrt1 power limiter time constant 1select a value that matches the thermal time constant of the loudspeaker?s voice coil. 2 value time constant (s) value time constant (s) 0x0 disabled 0x8 3.75 0x1 0.50 0x9 5.00 1 0x2 0.67 0xa 6.66 0x3 0.89 0xb 8.88 0x4 1.19 0xc reserved 0 0x5 1.58 0xd reserved 0x6 2.11 0xe reserved 0x7 2.81 0xf reserved downloaded from: http:///
_______________________________________________________________ maxim integrated products 103 MAX98088 stereo audio codec with flexsound technology headphone directdrive headphone amplifier traditional single-supply headphone amplifiers have outputs biased at a nominal dc voltage (typically half the supply). large coupling capacitors are needed to block this dc bias from the headphone. without these capacitors, a significant amount of dc current flows to the headphone, resulting in unnecessary power dis - sipation and possible damage to both headphone and headphone amplifier. maxim?s second-generation directdrive architecture uses a charge pump to create an internal negative sup - ply voltage. this allows the headphone outputs of the ics to be biased at gnd while operating from a single supply ( figure 28 ). without a dc component, there is no need for the large dc-blocking capacitors. instead of two large (220f typ) capacitors, the ic?s charge pump requires 3 small ceramic capacitors, conserving board space, reducing cost, and improving the frequency response of the headphone amplifier. charge pump the dual-mode charge pump generates both the positive and negative power supply for the headphone amplifier. to maximize efficiency, both the charge pump?s switching frequency and output voltage change based on signal level. when the input signal level is less than 10% of pvdd, the switching frequency is reduced to a low rate. this minimizes switching losses in the charge pump. when the input signal exceeds 10% of pvdd, the switching fre- quency increases to support the load current. for input signals below 25% of pvdd, the charge pump generates q (pvdd/2) to minimize the voltage drop across the amplifier?s power stage and thus improve efficiency. input signals that exceed 25% of pvdd cause the charge pump to output q pvdd. the higher output voltage allows for full output power from the headphone amplifier. to prevent audible gliches when transitioning from the q (pvdd/2) output mode to the q pvdd output mode, the charge pump transitions very quickly. this quick change draws significant current from pvdd for the duration of the transition. the bypass capacitor on pvdd supplies the required current and prevents droop on pvdd. the charge pump?s dynamic switching mode can be turned off through the i 2 c interface. the charge pump can then be forced to output either q (pvdd/2) or q pvdd regardless of input signal level. table 26. distortion limiter registers register bit name description 0x46 7 thdclp distortion limitmeasured in % thd+n. 6 value thd+n limit (%) value thd+n limit (%) 0x0 limiter disabled 0x8 12 5 0x1 < 1 0x9 14 0x2 1 0xa 16 0x3 2 0xb 18 4 0x4 4 0xc 20 0x5 6 0xd 21 0x6 8 0xe 22 0x7 10 0xf 24 0 thdt1 distortion limiter release time constantduration of time required for the speaker amplifier?s output gain to adjust back to the nominal level after a large signal has passed. 0 = 1.4s 1 = 2.8s downloaded from: http:///
_______________________________________________________________ maxim integrated products 104 MAX98088 stereo audio codec with flexsound technology class h operation a class h amplifier uses a class ab output stage with power supplies that are modulated by the output signal. in the case of the ics, two nominal power-supply differ - entials of 1.8v (+0.9v to -0.9v) and 3.6v (+1.8v to -1.8v) are available from the charge pump. figure 29 shows the operation of the output-voltage-dependent power supply figure 28. traditional amplifier output vs. directdrive output figure 30. headphone amplifier block diagram figure 29. class h operation dalen dacl daren dacr mixhpr mix mixhpl mix mixhpl_path sel mixhpr_ path sel hpvoll:+3db to -67db hpl hpsns hplen hpvolr:+3db to -67db hpr hpren 32ms32ms 1.8v0.9v v th_h v th_l -0.9v-1.8v hpvdd hpvss outputvoltage v dd v dd /2 gnd conventional amplifier biasing scheme directdrive amplifier biasing scheme +v dd gnd -v dd (v ss ) downloaded from: http:///
_______________________________________________________________ maxim integrated products 105 MAX98088 stereo audio codec with flexsound technology headphone output mixers the headphone amplifier mixer accepts input from the stereo dac, the line inputs (single-ended or differential), and the mic inputs. configure the mixer to mix any com - bination of the available sources. when more than one signal is selected, the mixer can be configured to attenu - ate the signal by 6db, 9db, or 12db. the stereo dac can bypass the headphone mixers, and be connected directly to the headphone amplifiers to provide lower power consumption. table 27. headphone output mixer register register bit name description 0x25 7 mixhpl left headphone output mixer1xxxxxxx = right dac x1xxxxxx = mic2 xx1xxxxx = mic1 xxx1xxxx = inb2 (inbdiff = 0) or inb2-inb1 (inbdiff = 1) xxxx1xxx = inb1 xxxxx1xx = ina2 (inadiff = 0) or ina2-inb1 (inadiff = 1) xxxxxx1x = ina1 xxxxxxx1 = left dac 65 4 3 2 1 0 0x26 7 mixhpr right headphone output mixer1xxxxxxx = left dac x1xxxxxx = mic2 xx1xxxxx = mic1 xxx1xxxx = inb2 (inbdiff = 0) or inb2-inb1 (inbdiff = 1) xxxx1xxx = inb1 xxxxx1xx = ina2 (inadiff = 0) or ina2-ina1 (inadiff = 1) xxxxxx1x = ina1 xxxxxxx1 = right dac 65 4 3 2 1 0 0x27 5 mixhpr_ path sel right headphone mixer path select0 = directly connect to the right dac (bypass right headphone output mixer) 1 = right headphone output mixer 4 mixhpl_ path sel left headphone mixer path select0 = directly connect to the left dac (bypass left headphone output mixer) 1 = left headphone output mixer 3 mixhpr _gain right headphone mixer gain select00 = 0db 01 = -6db 10 = -9db 11 = -12db 21 mixhpl _gain left headphone mixer gain select00 = 0db 01 = -6db 10 = -9db 11 = -12db 0 downloaded from: http:///
_______________________________________________________________ maxim integrated products 106 MAX98088 stereo audio codec with flexsound technology table 28. headphone output level register headphone output volume register bit name description 0x39/0x3a 7 hplm/hprm headphone output mute0 = disabled 1 = enabled 4 hpvoll/hpvolr left/right headphone output volume level value volume (db) value volume (db) 0x00 -67 0x10 -15 0x01 -63 0x11 -13 0x02 -59 0x12 -11 3 0x03 -55 0x13 -9 0x04 -51 0x14 -7 0x05 -47 0x15 -5 0x06 -43 0x16 -4 2 0x07 -40 0x17 -3 0x08 -37 0x18 -2 0x09 -34 0x19 -1 1 0x0a -31 0x1a 0 0x0b -28 0x1b +1 0x0c -25 0x1c +1.5 0 0x0d -22 0x1d +2 0x0e -19 0x1e +2.5 0x0f -17 0x1f +3 downloaded from: http:///
_______________________________________________________________ maxim integrated products 107 MAX98088 stereo audio codec with flexsound technology output bypass switches the ic includes two output bypass switches that solve common applications problems. when a single trans - ducer is used for the loudspeaker and receiver, the need exists for two amplifiers to power the same transducer. bypass switches connect the ic?s receiver amplifier output to the speaker amplifier?s output, allowing either amplifier to power the same transducer. in systems where an external receiver amplifier is used, route its output to the left speaker through recp/rxinp and recn/rxinn, bypassing the class d amplifier. in systems where an external amplifier drives both the receiver and the ic?s line input, one of the differential signals can be discon - nected from the receiver when not needed by passing it through the analog switch that connects recp/rxinp to recn/rxinn. figure 31. output bypass switch block diagrams table 29. output bypass switches register register bit name description 0x4a 7 inabyp see the microphone inputs section. 4 mic2byp 1 recbyp rxinp to rxinn bypass switchshorts rxinp to rxinn allowing a signal to pass through the ics. disable the receiver amplifier when recbyp = 1. 0 = disabled 1 = enabled 0 spkbyp rxin to spkl bypass switchshorts rxinp/rxinn to spklp/spkln allowing either the internal or an external receiv - er amplifier to power the left speaker. disable the left speaker amplifier when spkbyp = 1. 0 = disabled 1 = enabled external receiver amp recp/rxinp splen power/distortion limiter spkbyp 10 i * 10 i * recn/rxinn spklvdd spklp spkln spklgnd +6db *optional 10 i resistors improve distortion through the analog switch. speaker amplifier bypass using an external receiver amplifier re cbyp re cren re clen 0db0db recp/rxinp splen power/distortion limiter spkbyp recn/rxinn spklvdd spklp spkln spklgnd +6db speaker amplifier bypass using the internal receiver amplifier re cbyp re cren re clen 0db0db recp/rxinp splen power/distortion limiter spkbyp recn/rxinn spklvdd spklp spkln spklgnd +6db controlling an external receive amplifier and speaker re cbyp re cren re clen 0db0db external receiver amp downloaded from: http:///
_______________________________________________________________ maxim integrated products 108 MAX98088 stereo audio codec with flexsound technology click-and-pop reduction the ic includes extensive click-and-pop reduction cir - cuitry. the circuitry minimizes clicks and pops at turn-on, turn-off, and during volume changes. zero-crossing detection is implemented on all analog pgas and volume controls to prevent large glitches when volume changes are made. instead of making a volume change immediately, the change is made when the audio signal crosses the midpoint. if no zero-crossing occurs within the timeout window, the change is forced. volume slewing breaks up large volume changes into the smallest available step size and the steps through each step between the initial and final volume setting. when enabled, volume slewing also occurs at device turn-on and turn-off. during turn-on the volume is set to mute before the output is enabled. once the output is on, the volume ramps to the desired level. at turn-off the volume is ramped to mute before the outputs are disabled. when there is no audio signal zero-crossing detection can prevent volume slewing from occurring. enable enhanced volume slewing to prevent the volume control - ler from requesting another volume level until the previ - ous one has been set. each step in the volume ramp then occurs after a zero crossing has occurred in the audio signal or the timeout window has expired. during turn-off, enhance volume slewing is always disabled. table 30. click-and-pop reduction register register bit name description 0x47 7 vs2en enhanced volume smoothingduring volume slewing, the controller waits for each step in the ramp to be applied before sending the next step. when zero-crossing detection is enabled this prevents large steps in the output volume when no zero crossings are detected. 0 = enabled 1 = disabled applies to volume changes in hpvoll, hpvolr, recvol, spvoll, and spvolr. 6 vsen volume adjustment smoothingvolume changes are smoothed by stepping through intermediate steps. also ramps the volume from minimum to the programmed value at turn-on and back to minimum at turn-off. 0 = enabled 1 = disabled applies to volume changes in hpvoll, hpvolr, recvol, spvoll, and spvolr. 5 zden zero-crossing detectionholds volume changes until there is a zero crossing in the audio signal. this reduces click and pop during volume changes (zipper noise). if no zero crossing is detected within 100ms, the volume change is forced. 0 = enabled 1 = disabled applies to volume changes in pgam1, pgam2, pgaouta, pgaoutb, pgaoutc, hpvoll, hpvolr, recvol, spvoll, and spvolr. 1 eq2en see the 5-band parametric eq section. 0 eq1en downloaded from: http:///
_______________________________________________________________ maxim integrated products 109 MAX98088 stereo audio codec with flexsound technology jack detection the ic features jack detection that can detect the inser - tion and removal of a jack. when a jack is detected, an interrupt on irq can be triggered to alert the microcon - troller of the event. figure 32 shows the typical configura - tion for jack detection. jack detection and removal when the ic is in normal operation and the micbias is enabled, jack insertion and removal can be detected through jacksns. to detect a jack insertion and removal, the ics must be powered on and micbias enabled. set jdeten, mben, biasen, and vcmen bits to enable jack detection circuitry. jacksns is pulled up by micbias as long as no load is applied to jacksns. table 31 shows the change in jksns that occurs when a jack is inserted and removed. figure 32. typical configuration for jack detectiontable 31. change in jksns upon jack insertion table 32. change in jksns upon jack removal gnd gnd rl mic gnd rl gnd gnd rl mic gnd rl jack type mben = 1, biasen = 1, vcmen = 1 jksns: 1 0 jksns: 1 0 jack type mben = 1, biasen = 1, vcmen = 1 jksns: 0 1 jksns: 0 1 hpl micbiasjacksns mic1p hpr downloaded from: http:///
_______________________________________________________________ maxim integrated products 110 MAX98088 stereo audio codec with flexsound technology battery measurement the ic measures the voltage applied to spklvdd (typically the battery voltage) and reports the value in register 0x03. this value is also used by the speaker limiter circuitry to set accurate thresholds. when the battery measurement func - tion is disabled, the battery voltage is user programmable. table 33. jack detection registerstable 34. battery measurement registers register bit name description 0x02 (read only) 6 jksns jacksns statereports the status of jacksns when jdeten = 1, mben = 1, biasen = 1, and vcmen = 1. 0 = jacksns low 1 = jacksns high 0x4b 7 jdeten jack detection enable0 = disabled 1 = enabled 1 jdeb jack detection debounce configures the debounce time for setting jdet.00 = 25ms 01 = 50ms 10 = 100ms 11 = 200ms 0 register bit name description 0x03 4 vbat battery voltageread vbat when v baten = 1 to determine v spklvdd . program vbat when v baten = 0 to allow proper speaker amplifier signal processing. calculate/program the battery voltage using the following formula: v battery = 2.55v + [vbat/10] 32 1 0 0x51 7 shdn see the power management section. 6 vbaten battery measurement enable. enables an internal adc to measure v spklvdd . 0 = disabled (register 0x03 readable and writeable)1 = enabled (register 0x03 read only) 3 perfmode see the power management section. 2 hpplybck see the power management section. 1 pwrsv8k see the power management section. 0 pwrsv see the power management section. downloaded from: http:///
_______________________________________________________________ maxim integrated products 111 MAX98088 stereo audio codec with flexsound technology device status the ic uses register 0x00 and irq to report the status of various device functions. the status register bits are set when their respective events occur, and cleared upon reading the register. device status can be determined either by poling register 0x00 or configuring the irq to pull low when specific events occur. irq is an open-drain output that requires a pullup resistor for proper operation. register 0x0f determines which bits in the status register trigger irq to pull low. table 35. status and interrupt registers register bit name description 0x00 (read only) 7 cld full scale0 = all digital signals are less than full scale. 1 = the dac or adc signal path has reached or exceeded full scale. this typically indicates clipping. 6 sld volume slew completesld reports that any of the programmable-gain arrays or volume controllers has com - pleted slewing from a previous setting to a new programmed setting. if multiple gain arrays or volume controllers are changed at the same time, the sld flag is set after the last volume slew completes. sld also reports when the digital audio interface soft-start or soft-stop process has completed. mclk is required for proper sld operation. 0 = no volume slewing sequences have completed since the status register was last read. 1 = volume slewing complete. 5 ulk digital audio interface unlocked0 = both digital audio interfaces are operating normally. 1 = either digital audio interface is configured incorrectly or receiving invalid clocks. 1 jdet jack configuration changejdet reports changes to any bit in the jack status register (0x02). changes to the jack status bits are debounced before setting jdet. the debounce period is programmable using the jdeb bits. jdet is always set the first time jdeten or shdn is set the first time power is applied to the ic. read the status register following such an event to clear jdet and allow for proper jack detection. 0 = no change in jack configuration. 1 = jack configuration has changed. 0x0f 7 icld full-scale interrupt enable0 = disabled 1 = enabled 6 isld volume slew complete interrupt enable0 = disabled 1 = enabled 5 iulk digital audio interface unlocked interrupt enable0 = disabled 1 = enabled 1 ijdet jack configuration change interrupt enable 0 = disabled1 = enabled downloaded from: http:///
_______________________________________________________________ maxim integrated products 112 MAX98088 stereo audio codec with flexsound technology i 2 c serial interface the ic features an i 2 c/smbus k -compatible, 2-wire serial interface comprising a serial-data line (sda) and a serial-clock line (scl). sda and scl facilitate com - munication between the ic and the master at clock rates up to 400khz. figure 5 shows the 2-wire interface timing diagram. the master generates scl and initiates data transfer on the bus. the master device writes data to the ic by transmitting the proper slave address followed by the register address and then the data word. each trans - mit sequence is framed by a start (s) or repeated start (sr) condition and a stop (p) condition. each word transmitted to the ic is 8 bits long and is followed by an acknowledge clock pulse. a master reading data from the ic transmits the proper slave address followed by a series of nine scl pulses. the ic transmits data on sda in sync with the master-generated scl pulses. the master acknowledges receipt of each byte of data. each read sequence is framed by a start or repeated start condition, a not acknowledge, and a stop condi - tion. sda operates as both an input and an open-drain output. a pullup resistor, typically greater than 500 i , is required on sda. scl operates only as an input. a pullup resistor, typically greater than 500 i , is required on scl if there are multiple masters on the bus, or if the single master has an open-drain scl output. series resistors in line with sda and scl are optional. series resistors protect the digital inputs of the ic from high voltage spikes on the bus lines, and minimize crosstalk and undershoot of the bus signals. bit transfer one data bit is transferred during each scl cycle. the data on sda must remain stable during the high period of the scl pulse. changes in sda while scl is high are con - trol signals (see the start and stop conditions section). start and stop conditions sda and scl idle high when the bus is not in use. a mas - ter initiates communication by issuing a start condition. a start condition is a high-to-low transition on sda with scl high. a stop condition is a low-to-high transition on sda while scl is high ( figure 33 ). a start condition from the master signals the beginning of a transmission to the ic. the master terminates transmission, and frees the bus, by issuing a stop condition. the bus remains active if a repeated start condition is generated instead of a stop condition. early stop conditions the ic recognizes a stop condition at any point during data transmission except if the stop condition occurs in the same high pulse as a start condition. for proper operation, do not send a stop condition during the same scl high pulse as the start condition. table 36. device revision register figure 33. start, stop, and repeated start conditions smbus is a trademark of intel corp. device revision register bit name description 0xff (read only) 7 rev device revision coderev is always set to 0x40. 65 4 3 2 1 0 scl sda ss rp downloaded from: http:///
_______________________________________________________________ maxim integrated products 113 MAX98088 stereo audio codec with flexsound technology slave address the slave address is defined as the seven most signifi - cant bits (msbs) followed by the read/write bit. for the ic, the seven most significant bits are 0010000. setting the read/write bit to 1 (slave address = 0x21) configures the ic for read mode. setting the read/write bit to 0 (slave address = 0x20) configures the ics for write mode. the address is the first byte of information sent to the ic after the start condition. acknowledge the acknowledge bit (ack) is a clocked 9th bit that the ic uses to handshake receipt each byte of data when in write mode ( figure 34 ). the ic pulls down sda dur - ing the entire master-generated 9th clock pulse if the previous byte is successfully received. monitoring ack allows for detection of unsuccessful data transfers. an unsuccessful data transfer occurs if a receiving device is busy or if a system fault has occurred. in the event of an unsuccessful data transfer, the bus master retries communication. the master pulls down sda during the 9th clock cycle to acknowledge receipt of data when the ic is in read mode. an acknowledge is sent by the master after each read byte to allow data transfer to continue. a not acknowledge is sent when the master reads the final byte of data from the ic, followed by a stop condition. write data format a write to the ic includes transmission of a start condi - tion, the slave address with the r/ w bit set to 0, one byte of data to configure the internal register address pointer, one or more bytes of data, and a stop condition. figure 35 illustrates the proper frame format for writing one byte of data to the ic. figure 35 illustrates the frame format for writing n-bytes of data to the ic. figure 34. acknowledgefigure 35. writing one byte of data to the ics figure 36. writing n-bytes of data to the ics 1 scl start condition sda 28 9 clock pulse for acknowledgment acknowledge not acknowledge 1 byte autoincrement internal register address pointer acknowledge from MAX98088 b7 b6 b5 b4 b3 b2 b1 b0 acknowledge from MAX98088 acknowledge from MAX98088 s o a a ap slave address r/ w register address data byte acknowledge from MAX98088 slave address register address data byte 1 autoincrement internal register address pointer 1 byte acknowledge from MAX98088 acknowledge from MAX98088 acknowledge from MAX98088 b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0 s o a a a data byte n 1 byte pa r/w downloaded from: http:///
_______________________________________________________________ maxim integrated products 114 MAX98088 stereo audio codec with flexsound technology the slave address with the r/ w bit set to 0 indicates that the master intends to write data to the ics. the ics acknowledge receipt of the address byte during the master-generated 9th scl pulse. the second byte transmitted from the master configures the ic?s internal register address pointer. the pointer tells the ic where to write the next byte of data. an acknowl - edge pulse is sent by the ics upon receipt of the address pointer data. the third byte sent to the ics contains the data that is written to the chosen register. an acknowledge pulse from the ics signals receipt of the data byte. the address pointer autoincrements to the next register address after each received data byte. this autoincrement feature allows a master to write to sequential registers within one continuous frame. the master signals the end of trans - mission by issuing a stop condition. register addresses greater than 0xc7 are reserved. do not write to these addresses. read data format send the slave address with the r/ w bit set to 1 to initi - ate a read operation. the ic acknowledges receipt of its slave address by pulling sda low during the 9th scl clock pulse. a start command followed by a read com - mand resets the address pointer to register 0x00. the first byte transmitted from the ics is the content of register 0x00. transmitted data is valid on the rising edge of scl. the address pointer autoincrements after each read data byte. this autoincrement feature allows all registers to be read sequentially within one continuous frame. a stop condition can be issued after any number of read data bytes. if a stop condition is issued followed by another read operation, the first data byte to be read is from register 0x00. the address pointer can be preset to a specific register before a read command is issued. the master pre - sets the address pointer by first sending the ic?s slave address with the r/ w bit set to 0 followed by the register address. a repeated start condition is then sent fol - lowed by the slave address with the r/ w bit set to 1. the ic then transmits the contents of the specified register. the address pointer autoincrements after transmitting the first byte. the master acknowledges receipt of each read byte during the acknowledge clock pulse. the master must acknowl - edge all correctly received bytes except the last byte. the final byte must be followed by a not acknowledge from the master and then a stop condition. figure 37 illustrates the frame format for reading one byte from the ic. figure 38 illustrates the frame format for reading multiple bytes from the ics. figure 37. reading one byte of data from the icsfigure 38. reading n bytes of data from the ics acknowledge from MAX98088 acknowledge from MAX98088 acknowledge from MAX98088 autoincrement internal register address pointer 1 byte repeated start s o a a sr 1 a a slave address register address slave address data byte r/ w r/ w acknowledge from MAX98088 acknowledge from MAX98088 acknowledge from MAX98088 not acknowledge from master autoincrement internal register address pointer 1 byte p repeated start s oa a sr 1 a a slave address register address slave address data byte r/ w r/ w downloaded from: http:///
_______________________________________________________________ maxim integrated products 115 MAX98088 stereo audio codec with flexsound technology applications information typical operating circuits figures 39 and 40 provide example operating circuits for the ics. sthe external components shown are the minimum required for the ics to operate. additional components may be required by the application. figure 39. typical application circuit using analog microphone inputs and the bypass switch 2.2k i 1k i 1k i irq 1.8v to 5.5v 10k i to microcontroller 10mhz to 60mhz clock input digital audio port 1 i 2 c control port microphone output to baseband jacksns headset microphone 1 f f 1 f f 1 f f 2.2 f f 1 f f handset microphone 1 f f 1 f f digitalaudio port 2 jacksns bypassswitch input lrclks2 bclks2 sdins2 sdouts2 jacksns recp/rxinp rec n/ rxinn spklp spklnspkrp spkrn hpr hpl hpsns ref reg mclkbclks1 lrclks1 sdins1 sdouts1 sda scl mic1 p/ digmicdata mic1 n/ digmicclk micbiasmic2p mic2n ina1/extmicp ina2/extmicn inb1 inb2 line input 1 f f 1 f f 1 f f 1 f f agnd hpgnd spkrgnd spklgnd c1n hpvss 1 f f hpvdd c1p dgnd dvdds1 dvdd pvdd avdd spklvdd spkrvdd dvdds2 1 f f1 f f 10 f f 1.8v to 3.6v 2.8v to 5.5v 1.8v 1.8v to 3.6v 1 f f 1 f f 1 f f 1 f f 1 f f 8 i 8 i MAX98088 downloaded from: http:///
_______________________________________________________________ maxim integrated products 116 MAX98088 stereo audio codec with flexsound technology figure 40. typical application circuit using the digital microphone input and receiver amplifier irq 10k i to microcontroller 10mhz to 60mhz clock input digital audio port 1 i 2 c control port 1 f f 2.2 f f digitalaudio port 2 jacksns lrclks2 bclks2 sdins2 sdouts2 jacksns recp/rxinp rec n/ rxinn spklp spklnspkrp spkrn hpr hpl hpsns ref reg mclkbclks1 lrclks1 sdins1 sdouts1 sda scl mic1 p/ digmicdata mic1 n/ digmicclk micbiasmic2p mic2n ina1/extmicp ina2/extmicn inb1 inb2 2.2k i digital mic 1 digital mic 2 jacksns headset microphone 1 f f 1 f f 1 f f data clock data clock line input 1 f f 1 f f line input 1 f f 1 f f 32 i dvdds1 dvdd pvdd avdd spklvdd spkrvdd dvdds2 1 f f1 f f 10 f f 1.8v to 3.6v 1.8v 1.8v to 3.6v 1 f f 1 f f 1 f f 1 f f 1 f f 2.8v to 5.5v 1.8v to 5.5v MAX98088 8 i 8 i 1 f f 1 f f agnd hpgnd spkrgnd spklgnd c1n hpvss 1 f f hpvdd c1p dgnd downloaded from: http:///
_______________________________________________________________ maxim integrated products 117 MAX98088 stereo audio codec with flexsound technology filterless class d operation traditional class d amplifiers require an output filter to recover the audio signal from the amplifier?s output. the filters add cost, increase the solution size of the amplifier, and can decrease efficiency and thd+n performance. the traditional pwm scheme uses large differential output swings (2 x v dd peak to peak) and causes large ripple currents. any parasitic resistance in the filter components results in a loss of power, lowering the efficiency. the ic does not require an output filter. the device relies on the inherent inductance of the speaker coil and the natural filtering of both the speaker and the human ear to recover the audio component of the square-wave out - put. eliminating the output filter results in a smaller, less costly, more efficient solution. because the frequency of the ic?s output is well beyond the bandwidth of most speakers, voice coil movement due to the square-wave frequency is very small. although this movement is small, a speaker not designed to handle the additional power can be damaged. for optimum results, use a speaker with a series inductance > 10 f h. typical 8 i speakers exhibit series inductances in the 20 f h to 100 f h range. rf susceptibility gsm radios transmit using time-division multiple access (tdma) with 217hz intervals. the result is an rf signal with strong amplitude modulation at 217hz and its har - monics that is easily demodulated by audio amplifiers. the ic is designed specifically to reject rf signals; how - ever, pcb layout has a large impact on the susceptibility of the end product. in rf applications, improvements to both layout and com - ponent selection decrease the ic?s susceptibility to rf noise and prevent rf signals from being demodulated into audible noise. trace lengths should be kept below 1/4 of the wavelength of the rf frequency of interest. minimizing the trace lengths prevents them from functioning as anten - nas and coupling rf signals into the ic. the wavelength ( l ) in meters is given by: l = c/f where c = 3 x 10 8 m/s, and f = the rf frequency of interest.route audio signals on middle layers of the pcb to allow ground planes above and below to shield them from rf interference. ideally, the top and bottom layers of the pcb should primarily be ground planes to create effec - tive shielding. additional rf immunity can also be obtained by rely - ing on the self-resonant frequency of capacitors as it exhibits a frequency response similar to a notch filter. depending on the manufacturer, 10pf to 20pf capaci - tors typically exhibit self resonance at the rf frequencies of interest. these capacitors, when placed at the input pins, can effectively shunt the rf noise to ground. for these capacitors to be effective, they must have a low- impedance, low-inductance path to the ground plane. avoid using microvias to connect to the ground plane whenever possible as these vias do not conduct well at rf frequencies. startup/shutdown sequencing to ensure proper device initialization and minimal click- and-pop, program the ic?s shdn = 1 after configuring all registers. table 37 lists an example startup sequence for the device. to shut down the ic, simply set shdn = 0. table 37. example startup sequence sequence description registers 1 ensure shdn = 0 0x51 2 configure clocks 0x10 to 0x13, 0x19 to 0x1b 3 configure digital audio interface 0x14 to 0x17, 0x1c to 0x1f 4 configure digital signal processing 0x18, 0x20, 0x3f to 0x46 5 load coefficients 0x52 to 0xc9 6 configure mixers 0x22 to 0x2d 7 configure gain and volume controls 0x2e to 0x3e 8 configure miscellaneous functions 0x47 to 0x4b 9 enable desired functions 0x4c, 0x50 10 set shdn = 1 0x51 downloaded from: http:///
_______________________________________________________________ maxim integrated products 118 MAX98088 stereo audio codec with flexsound technology many configuration options in the ics can be made while the devices are operating, however, some regis - ters should only be adjusted when the corresponding audio path is disabled. table 38 lists the registers that are sensitive during operation. either disable the cor - responding audio path or set shdn = 0 while changing these registers. component selection optional ferrite bead filter in applications where speaker leads exceed 20mm, additional emi suppression can be achieved by using a filter constructed from a ferrite bead and a capacitor to ground ( figure 41 ). use a ferrite bead with low dc resis - tance, high-frequency (> 600mhz) impedance between 100 i and 600 i , and rated for at least 1a. the capacitor value varies based on the ferrite bead chosen and the actual speaker lead length. select a capacitor less than 1nf based on emi performance. input capacitor an input capacitor, c in , in conjunction with the input impedance of the ic line inputs forms a highpass filter that removes the dc bias from an incoming analog signal. the ac coupling capacitor allows the amplifier to automatically bias the signal to an optimum dc level. assuming zero-source impedance, the -3db point of the highpass filter is given by: -3db in in 1 f 2r c = choose c in so that f -3db is well below the lowest fre - quency of interest. for best audio quality use capacitors whose dielectrics have low-voltage coefficients, such as tantalum or aluminum electrolytic. capacitors with high- voltage coefficients, such as ceramics, may result in increased distortion at low frequencies. charge-pump capacitor selection use capacitors with an esr less than 100m i for optimum performance. low-esr ceramic capacitors minimize the output resistance of the charge pump. most surface- mount ceramic capacitors satisfy the esr requirement. for best performance over the extended temperature range, select capacitors with an x7r dielectric. table 38. registers that are sensitive to changes during operation figure 41. optional class d ferrite bead filter register description 0x10 to 0x13, 0x19 to 0x1b clock control registers 0x14 to 0x17, 0x1c to 0x1f digital audio interface configuration 0x18, 0x20 digital passband filters 0x25 to 0x2d analog mixers 0x52 to 0xc9 digital signal processing coefficients MAX98088 spk_p spk_n downloaded from: http:///
_______________________________________________________________ maxim integrated products 119 MAX98088 stereo audio codec with flexsound technology charge-pump flying capacitor the value of the flying capacitor (connected between c1n and c1p) affects the output resistance of the charge pump. a value that is too small degrades the device?s ability to provide sufficient current drive, which leads to a loss of output voltage. increasing the value of the flying capacitor reduces the charge-pump output resistance to an extent. above 1 f f, the on-resistance of the internal switches and the esr of external charge- pump capaci - tors dominate. charge-pump holding capacitor the holding capacitor (bypassing hpvss) value and esr directly affect the ripple at hpvss. increasing the capac - itor?s value reduces output ripple. likewise, decreasing the esr reduces both ripple and output resistance. lower capacitance values can be used in systems with low maximum output power levels. see the output power vs. load resistance graph in the typical operating characteristics section for more information unused pins table 39 shows how to connect the ic?s pins when unused. table 39. unused pins name connection name connection spkrp unconnected inb1 unconnected spkrvdd always connect ina2/micextn unconnected spklvdd always connect lrclks2 unconnected spklp unconnected mclk always connect recn/rxinn unconnected sdins2 agnd hpvdd unconnected irq unconnected c1p unconnected mic1p/digmicdata unconnected hpgnd agnd ina1/micextp unconnected spkrn unconnected dgnd always connect spkrgnd always connect bclks2 unconnected spklgnd always connect sda always connect spkln unconnected scl always connect recp/rxinp unconnected reg always connect c1n unconnected ref always connect hpl unconnected mic1n/digmicclk unconnected hpvss unconnected mic2p unconnected sdins1 agnd sdouts2 unconnected lrclks1 unconnected dvdds2 dvdd hpsns agnd dvdd always connect inb2 unconnected avdd always connect hpr unconnected pvdd always connect dvdds1 dvdd agnd always connect sdouts1 unconnected micbias unconnected bclks1 unconnected mic2n unconnected jacksns unconnected downloaded from: http:///
_______________________________________________________________ maxim integrated products 120 MAX98088 stereo audio codec with flexsound technology recommended pcb routing the ic uses a 63-bump wlp package. figure 42 provides an example of how to connect to all active bumps using 3 layers of the pcb. to ensure uninterrupted ground returns, use layer 2 as a connecting layer between layer 1 and layer 2 and flood the remaining area with ground. supply bypassing, layout, and grounding proper layout and grounding are essential for optimum performance. when designing a pcb for the ics, parti - tion the circuitry so that the analog sections of the ic are separated from the digital sections. this ensures that the analog audio traces are not routed near digital traces. use a large continuous ground plane on a dedicated layer of the pcb to minimize loop areas. connect agnd, dgnd, hpgnd, spklgnd, and spkrgnd directly to the ground plane using the shortest trace length possible. proper grounding improves audio performance, minimizes crosstalk between channels, and prevents any digital noise from coupling into the analog audio signals. ground the bypass capacitors on micbias, reg, and ref directly to the ground plane with minimum trace length. also be sure to minimize the path length to agnd. bypass avdd directly to agnd. connect all digital i/o termination to the ground plane with minimum path length to dgnd. bypass dvdd, dvdds1, and dvdds2 directly to dgnd. place the capacitor between c1p and c1n as close as possible to the ics to minimize trace length from c1p to c1n. inductance and resistance added between c1p and c1n reduce the output power of the headphone amplifier. bypass hpvdd and hpvss with a capaci - tor located close to hpvss with a short trace length to hpgnd. close decoupling of hpvss minimizes supply ripple and maximizes output power from the headphone amplifier. hpsns senses ground noise on the headphone jack and adds the same noise to the output audio signal, thereby making the output (headphone output minus ground) noise free. connect hpsns to the headphone jack shield to ensure accurate pickup of headphone ground noise. bypass spklvdd and spkrvdd to spklgnd and spkrgnd, respectively, with as little trace length as possible. connect spklp, spkln, spkrp, and spkrn to the stereo speakers using the shortest traces pos - sible. reducing trace length minimizes radiated emi. route spklp/spkln and spkrp/spkrn as differential pairs on the pcb to minimize loop area, thereby the inductance of the circuit. if filter components are used on the speaker outputs, be sure to locate them as close as possible to the ic to ensure maximum effectiveness. minimize the trace length from any ground-connected passive components to spklgnd and spkrgnd to further minimize radiated emi. figure 42. suggested routing for the MAX98088 layer 1 layer 2 layer 3 downloaded from: http:///
_______________________________________________________________ maxim integrated products 121 MAX98088 stereo audio codec with flexsound technology figure 43. wlp ball dimensions route microphone signals from the microphone to the ics as a differential pair, ensuring that the positive and nega - tive signals follow the same path as closely as possible with equal trace length. when using single-ended micro - phones or other single-ended audio sources, ground the negative microphone input as close as possible to the audio source and then treat the positive and negative traces as differential pairs. an evaluation kit (ev kit) is available to provide an exam - ple layout for the ic. the ev kit allows quick setup of the ic and includes easy-to-use software allowing all internal registers to be controlled. wlp applications information for the latest application details on wlp construction, dimensions, tape carrier information, pcb techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability test - ing results, refer to the application note 1891: wafer- level packaging (wlp) and its applications . figure 43 shows the dimensions of the wlp balls used on the MAX98088. + denotes lead(pb)-free/rohs-compliant package. ordering information part temp range pin-package MAX98088ewy+ -40 n c to +85 n c 63 wlp 0.24mm 0.21mm downloaded from: http:///
_______________________________________________________________ maxim integrated products 122 MAX98088 stereo audio codec with flexsound technology package type package code outline no. land pattern no. 63 wlp w633a3+1 21-0462 refer to application note 1891 package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?+?, ?#?, or ?-? in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. downloaded from: http:///
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 123 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. MAX98088 stereo audio codec with flexsound technology revision history revision number revision date description pages changed 0 6/10 initial release ? 1 6/11 made various updates, replaced tocs 56 and 68 1, 5?27, 29, 30, 33, 35, 37, 39, 41, 43, 46, 54, 55, 56, 63?67, 69, 70, 70, 74, 75, 77, 80, 81, 83?86, 90, 94?99, 101, 103, 104, 105, 107, 109, 110, 111, 113, 114, 119, 120 downloaded from: http:///

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