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general description the MAX9890 provides click-and-pop suppression for devices such as codecs with integrated headphone amplifiers that lack a clickless/popless startup/power- up or shutdown/power-down. the device controls the ramping of the dc bias voltage on the output-coupling capacitors and the application of the audio signal to ensure that no audible transients are present at the headphones. the MAX9890a features a 200ms startup time for use with up to 100? coupling capacitors. the MAX9890b features a 330ms startup time for use with greater than 100? coupling capacitors. the MAX9890 consumes 14? of supply current and 0.001? in shutdown, while contributing less than 0.003% thd+n into a 32? load. esd (human body model) protection circuitry on the outputs protect the MAX9890 and devices further up the signal chain from esd strikes up to ?kv. the MAX9890 is available in a miniature (1.5mm ? 1.5mm ? 0.6mm) 9-bump chip-scale package (ucsp), as well as an 8-pin tdfn package (3mm ? 3mm ? 0.8mm), and is specified for operation over the -40? to +85? extended temperature range. applications high-end notebook audio pdas portable dvd players cell phones portable mp3 players features 36db click-pop suppression 2.7v to 5.5v single-supply operation clickless/popless startup/power-up and shutdown/power-down 0.001a low-power shutdown mode thd+n < 0.003% into 32? 8kv esd protection (human body model) requires only one 0.1f capacitor to complete the circuit low 14a supply current tiny packaging 9-bump ucsp (1.5mm x 1.5mm x 0.6mm) 8-pin tdfn (3mm x 3mm x 0.8mm) MAX9890 audio click-pop suppressor ________________________________________________________________ maxim integrated products 1 ordering information 19-2932; rev 0; 8/03 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range pin- package top mark m ax 9890ae bl- t* -40 c to +85 c 9 ucsp-9 adv MAX9890aeta -40 c to +85 c 8 tdfn-ep** aha m ax 9890be bl- t* -40 c to +85 c 9 ucsp-9 adw MAX9890beta -40 c to +85 c 8 tdfn-ep** ahb selector guide part pin-package switch turn-on time (ms) MAX9890aebl-t 9 ucsp-9 200 MAX9890aeta 8 tdfn-ep 200 MAX9890bebl-t 9 ucsp-9 330 MAX9890beta 8 tdfn-ep 330 ucsp is a trademark of maxim integrated products, inc. *future product?ontact factory for availability. **ep = exposed pad. simplified block diagram ramp up single supply 2.7v to 5 5v MAX9890 inl inr outl outr ramp down typical application circuit and pin configurations appear at end of data sheet.
MAX9890 audio click-pop suppressor 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages are referenced to gnd) v cc ........................................................................................+6v cext, shdn shdn shdn shdn ? ? ? shdn ? shdn ? ? ? ?
MAX9890 audio click-pop suppressor _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = 3v, shdn = v cc , gnd = 0, c cext = 0.1f, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c.) (note 1) parameter symbol conditions min typ max units logic input ( shdn) logic-input high voltage v ih v cc = 2.7v to 5.5v 2.0 v logic-input low voltage v il v cc = 2.7v to 5.5v 0.8 v logic-input current i in 1 a note 1: all devices are 100% tested at t a = +25c. all temperature limits are guaranteed by design. note 2: supply current is measured when switch is on (i.e., shdn = v cc , t > t on ). note 3: supply voltage level where the device enters its power-down cycle. note 4: turn-on time is measured from the time v cc = 3v and shdn > v ih until the r on specification is met. note 5: switch turn-off time is measured from the time shdn < v il or v cc < v uvlo until the off-isolation specification is met. note 6: see the power-supply rejection ratio section for test method. typical operating characteristics (v cc = 3v, c cext = 0.1f, typical values are at t a = +25c, unless otherwise noted.) on-resistance vs. in_ voltage MAX9890 toc01 in_ voltage (v) on-resistance ( ) 4 3 2 1 0 3 0.4 0 5 0 6 0.7 0.8 0 2 05 v cc = 3v v cc = 5v supply current vs. temperature MAX9890 toc02 temperature ( c) supply current ( a) 60 35 -15 10 5 10 15 20 25 30 35 40 0 -40 85 v cc = 5.5v v cc = 2.7v shutdown current vs. temperature MAX9890 toc03 temperature ( c) shutdown current (pa) 60 35 10 -15 100 200 300 400 500 600 700 800 900 1000 0 -40 85 v cc = 2.7v v cc = 5 5v shdn = 0v
MAX9890 audio click-pop suppressor 4 _______________________________________________________________________________________ frequency (hz) on-loss (db) 10k 1k 100 10 100k on-loss vs. frequency MAX9890 toc04 -0 6 -0 2 0 2 0 6 1 0 -1 0 -0.8 -0.4 0 0.4 0.8 r l = 32? r l = 16? phase shift (degrees) -4 -3 -2 -1 0 1 2 -5 frequency (hz) 100 10 phase shift vs. frequency MAX9890 toc05 r l = 32? r l = 16? 10k 1k 100k off-isolation (db) -130 -110 -90 -70 -50 -30 -10 10 -150 frequency (hz) 10k 1k 100 10 100k off-isolation vs. frequency MAX9890 toc06 r l = 32? r l = 16? crosstalk (db) -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -150 frequency (hz) 10k 1k 100 10 100k crosstalk vs. frequency MAX9890 toc07 total harmonic distortion plus noise vs. output power MAX9890 toc08 output power (mw) thd+n (%) 225 200 175 150 125 100 75 50 25 0.01 0.1 1 10 100 0.001 0250 v cc = 5v r l = 16? f = 1khz 100 80 60 40 20 01 2 0 total harmonic distortion plus noise vs. output power MAX9890 toc09 output power (mw) thd+n (%) 0.01 0.1 1 10 100 0.001 v cc = 5v r l = 32? f = 1khz total harmonic distortion plus noise vs. output power MAX9890 toc10 output power (mw) thd+n (%) 225200175150125100755025 0 01 0.1 1 10 100 0 001 0 v cc = 3v r l = 16? f = 1khz 100 80 60 40 20 01 2 0 total harmonic distortion plus noise vs. output power MAX9890 toc11 output power (mw) thd+n (%) 0.01 0.1 1 10 100 0.001 v cc = 3v r l = 32? f = 1khz frequency (hz) thd+n (%) 10k 1k 100 0.001 0.01 0.1 1 0.0001 10 100k total harmonic distortion plus noise vs. frequency MAX9890 toc12 v cc = 5v r l = 16? output power = 25mw output power = 150mw typical operating characteristics (continued) (v cc = 3v, c cext = 0.1f, typical values are at t a = +25c, unless otherwise noted.)
MAX9890 audio click-pop suppressor _______________________________________________________________________________________ 5 frequency (hz) thd+n (%) 10k 1k 100 0 001 0 01 0.1 1 0 0001 10 100k total harmonic distortion plus noise vs. frequency MAX9890 toc13 v cc = 5v r l = 32? output power = 20mw output power = 80mw frequency (hz) thd+n (%) 10k 1k 100 0.001 0.01 0.1 1 0.0001 10 100k total harmonic distortion plus noise vs. frequency MAX9890 toc14 v cc = 3v r l = 16? output power = 100mw output power = 25mw frequency (hz) thd+n (%) 10k 1k 100 0.001 0.01 0.1 1 0.0001 10 100k total harmonic distortion plus noise vs. frequency MAX9890 toc15 v cc = 3v r l = 32? output power = 60mw output power = 20mw shdn 2v/div v out 1v/div v headphone 10mv/div 40ms/div startup waveform (dc) MAX9890 toc16 shdn 2v/div v out 1v/div v headphone 10mv/div 10s/div shutdown waveform (dc) MAX9890 toc17 shdn 2v/div v out 1v/div v headphone 1v/div 40ms/div startup waveform (ac) MAX9890 toc18 shdn 2v/div v out 1v/div v headphone 1v/div 1s/div shutdown waveform (ac) MAX9890 toc19 typical operating characteristics (continued) (v cc = 3v, c cext = 0.1f, typical values are at t a = +25c, unless otherwise noted.)
MAX9890 detailed description the MAX9890 provides click-and-pop suppression for single-supply devices such as codecs and other headphone amplifiers that do not have click-and-pop suppression. single-supply audio amplifier outputs have a dc bias voltage, v cc / 2, and require large out- put-coupling capacitors to block the dc voltage from the speaker. during startup or shutdown, the dc bias voltage is quickly raised or lowered (figure 1), resulting in an audible transient through the headphone load. the MAX9890 prevents the audible transient by slowly ramping the dc bias in an s-shaped waveform (figure 2), suppressing the large transient at the output of the coupling capacitor. the s-shaped waveform shapes the frequency spectrum, minimizing the amount of audible components present at the output. internal switches couple the inputs to the outputs after the coupling capacitors have fully charged to the input common-mode bias voltage. when power is removed or the device is put into shutdown, the internal switches in the MAX9890 immediately disconnect the output and slowly discharge the coupling capacitors through 220k resistors. the MAX9890 has an undervoltage lockout (uvlo) that prevents device operation when v cc is below the power-down threshold (2.5v, typ). the MAX9890 fea- tures 8kv esd (human body model) protection on the audio outputs. startup the MAX9890 monitors v cc and shdn shdn shdn shdn shdn shdn s shdn shdn shdn
switches the MAX9890 ? s internal switches connect the input to the output after the coupling capacitors are fully charged. the MAX9890a holds the switches open for 200ms and is ideal for coupling capacitors less than 100f. the MAX9890b has a longer turn-on time of 330ms and is ideal with larger coupling capacitors less than 220f. the internal switches have a low on-resistance (r on = 0.5 ) and on-resistance flatness (r flat(on) = 2m ) minimizing total harmonic distortion plus noise (thd+n). the rela- tionship below shows the contribution to thd+n through the switch, due to on-resistance and on-resistance flat- MAX9890 audio click-pop suppressor _______________________________________________________________________________________ 7 40ms/div fft: 25hz/div v out 1v/div v cc /shdn 2v/div v headphone 100mv/div fft headphone 20db/div 0db figure 1. startup/power-up sequence without click-pop suppression 40ms/div fft: 25hz/div v out 1v/div v headphone 50mv/div fft headphone 20db/div v cc /shdn 2v/div 0db figure 2. startup/power-up sequence with click-pop suppression 100ms/div fft: 25hz/div v out 1v/div v headphone 500mv/div v cc /shdn 2v/div fft headphone 20db/div 0db figure 3. shutdown/power-down sequence without click-pop suppression 100ms/div fft: 25hz/div v out 1v/div v headphone 20mv/div fft headphone 20db/div v cc /shdn 2v/div 0db figure 4. shutdown/power-down sequence with click-pop suppression
MAX9890 ness (on-resistance flatness is defined as the difference between the maximum and minimum values of on-resis- tance measured over the specific analog-signal range). power-supply rejection ratio (psrr) psrr is the measurement of ac power-supply ripple or noise that couples to the output. variations in supply volt- age corrupt the audio signal, due to changes in the r on value by supply modulation. the fft shown in figure 5 was taken with a 19khz 1v p-p sine wave onto the 5v dc supply voltage, and a 20khz 1v p-p sine wave applied at in_ with a 32 load is shown in figure 6. the MAX9890 maintains a -100db (typ) psrr across the supply voltage range eliminating any corruption of the audio signal from supply variations. therefore, with a zero audio signal, the r on variation due to supply voltage ripple does not con- tribute to any output signal modulation. low-frequency response in addition to the cost and size disadvantages of the output-coupling capacitors, these capacitors limit the amplifier ? s low-frequency response and can distort the audio signal. the impedance of a headphone or speaker load and the output-coupling capacitor form a highpass filter with the -3db point set by: where r l is the headphone impedance and c out is the output-coupling capacitor value. the highpass filter is required by conventional single-ended, single power- supply headphone drivers to block the midrail dc bias component of the audio signal from the headphones. the drawback to the filter is that it can attenuate low- frequency signals. larger values of c out reduce this effect but result in physically larger, more expensive capacitors. figure 7 shows the relationship between the size of c out and the resulting low-frequency attenua- tion. note that the -3db point for a 16 headphone with a 100f blocking capacitor is 100hz, well within the normal audio band, resulting in low-frequency attenua- tion of the reproduced signal. the MAX9890a and MAX9890b have different turn-on times to accommodate different size output-coupling capacitors (see table 1). using a capacitor smaller than the specified maximum allowed does not degrade click-pop suppression. therefore, capacitors less than 100f can be used with the a or b version devices. f rc db l out 3 1 2 thd r r maximum flat on load () % 4 100 audio click-pop suppressor 8 _______________________________________________________________________________________ -140 -70 -80 -90 -100 -110 -120 -130 -50 -60 -30 -40 -20 0 -10 10 15 17 19 21 23 25 v cc = 4.5v to 5.5v, f vcc = 19khz, r l = 32 , v in = 1v p-p , f in = 20khz frequency (khz) output spectrum (dbv) figure 5. fft for psrr ramp up v dc = 5v v ac = 1v p-p 19khz v dc = 2.0v v ac = 1v p-p 20khz shdn MAX9890 in_ in_ out_ r l out_ ramp down v cc figure 6. psrr test circuit
external capacitor (c cext ) the external click-pop suppression capacitor at cext serves a dual purpose. on power-up, c cext is charged by an internal current source and is used to slowly ramp up the external coupling capacitors. when the device is powered down, c cext powers the internal circuitry used to drain the external coupling capacitors. a 0.1f capacitor between cext and gnd provides clickless/popless operation with coupling capacitors for both the MAX9890a and MAX9890b, even with the rapid removal of supply voltage. applications information layout good layout improves performance by decreasing the amount of stray capacitance and noise. to decrease stray capacitance, minimize pc board trace lengths and resistor leads, and place external components as close to the device as possible. power supply and bypassing the excellent psrr of the MAX9890 allows it to operate from noisy power supplies. in most applications, a 0.1f capacitor from v cc to gnd is sufficient. this bypass capacitor should be placed close to v cc . ucsp applications information for the latest application details on ucsp construction, dimensions, tape-carrier information, printed circuit board techniques, bump-pad layout, and recommend- ed reflow temperature profile, as well as the latest infor- mation on reliability testing results, refer to the application note, ucsp ? a wafer-level chip-scale package available on maxim ? s website at www.maxim- ic.com/ucsp. chip information transistor count: 1001 process: bicmos MAX9890 audio click-pop suppressor _______________________________________________________________________________________ 9 0 -30 10 100 1k 10k 100k low-frequency rolloff (r l = 16 ) -24 -27 -12 -15 -18 -21 -6 -9 -3 frequency (hz) attenuation (db) 330 f 220 f 100 f 33 f figure 7. low-frequency attenuation for common dc-blocking capacitor values capacitor size (f) MAX9890a turn-on time (200ms) MAX9890b turn-on time (300ms) 33 ? ? ?
MAX9890 audio click-pop suppressor 10 ______________________________________________________________________________________ tdfn-ep top view 1 2 8 7 3 4 6 5 outr gnd outl cext inr shdn inl v cc MAX9890 note: gnd is connected to the underside metal slug. outr v cc gnd inr shdn inl cext outl ucsp a b c 12 3 MAX9890 (bumps on bottom) pin configurations hplout hprout startup and shutdown control gnd shdn outl outr inl inr cext v cc 0.1 f 1 f 5 7 3 2 4 6 8 1 2.7v to 5.5v ( ) ucsp bump. *user-defined value. (a2) (a1) (c3) (c1) (c2) (b1) (b3) (a3) * * MAX9890 ramp-up and ramp-down control codec with integrated headphone drivers typical application circuit
MAX9890 audio click-pop suppressor ______________________________________________________________________________________ 11 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .)
MAX9890 audio click-pop suppressor 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. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) 6, 8, &10l, qfn thin.eps proprietary information t tle approval document control no rev 2 1 package outline, 6, 8 & 10l, tdfn, exposed pad, 3x3x0.80 mm 21-0137 d l c l c sem conductor dallas a2 a pin 1 index area d e a1 d2 b e2 [(n/2)-1] x e ref. e k 1 n 1 l e l a l pin 1 id c0.35 detail a e number of leads shown are for reference only document control no approval title proprietary information rev 2 2 common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code 6 n t633-1 1.50?0.10 d2 2.30?0.10 e2 0.95 bsc e mo229 / weea jedec spec 0.40?0.05 b 1.90 ref [(n/2)-1] x e 1.50?0.10 mo229 / weec 1.95 ref 0.30?0.05 0.65 bsc 2.30?0.10 t833-1 8 package variations 21-0137 0.25?0.05 2.00 ref mo229 / weed-3 0.50 bsc 1.50?0.10 2.30?0.10 10 t1033-1 0.25 min. k a2 0.20 ref. d sem conductor dallas package outline, 6, 8 & 10l, tdfn, exposed pad, 3x3x0.80 mm

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