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may 2006 rev 1 1/75 75 TDA7540B am/fm car radio tuner ic with stereo decoder and intelligent select ivity system (iss) features fm-part rf agc generation by rf and if detection i/q mixer for 1st fm if 10.7mhz with image rejection mixer for 2nd if 450khz internal 450khz bandpass filter with bandwidth control by iss fully integrated fm-demodulator with spike cancellation am-part wide and narrow agc generation mixer for 1st if 10.7mhz, am upconversion mixer for 2nd if 450khz, am downconversion integrated am-demodulator am if- and audio noise blanking stereodecoder pll with adjustment free, fully integrated vco automatic pilot dependent mono/stereo switching programmable roll-off compensation high cut and stereo blend-characteristics programmable dedicated rds-mute internal noise blanker with several threshold controls additional features vco for world tuning range high performance fast pll for rds-system if counter for fm and am with search stop signal quality detector for leve l, deviation, adjacent channel and multipath iss (intelligent sele ctivity system) for cancellation of adjacent channel and noise influences adjacent channel mute fully electronic alignment all functions i 2 c-bus controlled description the tda7540 is a high performance tuner circuit for am/fm car radio. it contains mixer, if amplifier, demodulator for am and fm, stereodecoder, quality detection, iss filter and pll synthesizer with if counter on a single chip. use of bicmos technology allows the implementation of several tuning functions and a minimum of external components. order codes tqfp80 part number temp range, cpackage packing TDA7540B -40 to 85 tqfp80 tube www.st.com
contents TDA7540B 2/75 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 pins description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . 5 2.1 tqfp80 pins connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2.1 globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2.2 fm section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2.3 am section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2.4 stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3.2.5 pll section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1 fm section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1.1 mixer1, agc and 1.if . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1.2 mixer2, limiter and demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1.3 quality detection and iss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1.4 soft mute control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.2 am section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.3 stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.3.1 decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.3.2 functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . . 29 4.3.3 functional description of the multipath-detector . . . . . . . . . . . . . . . . . . 30 4.3.4 quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.3.5 afs control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.4 pll and if counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.4.1 pll frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.4.2 if counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 4.5 i 2 c-bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
TDA7540B contents 3/75 4.5.1 data transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.5.2 start condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.5.3 stop condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.5.4 acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.5.5 data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.5.6 device addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.5.7 write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.5.8 read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5 software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5.1 address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 5.2 control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.2.1 data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 6 appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 7 part list (application and me asurment circuit) . . . . . . . . . . . . . . . . . . 70 8 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 9 application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 10 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 11 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
block diagram TDA7540B 4/75 1 block diagram figure 1. block circuit diagram
TDA7540B pins description and connection diagrams 5/75 2 pins description and connection diagrams 2.1 tqfp80 pins connection diagram figure 2. tqfp80 pins connection (top view) 2.2 pin description 1 2 3 5 6 4 7 8 9 10 31 11 32 33 34 35 36 75 74 73 72 70 71 69 68 67 66 65 55 54 53 51 50 52 60 59 58 56 57 amrfagcout ammix1ref ammix1in test1 mix1 out1 devtc fmmix1in2 gndrf fmmix1in1 ampindr fmpindr xtalg isstc1 isstc2 xtald sda sstop scl fstc gndvcc3 lpout vcc3 if1amp1in if1ref if1amp1out vccif1 amrefdemc if1amp2in amdetc if1amp2out amrfagctc fmm1x2ref fmm1x2in amif2ref amif2bpf mpxout vccstereo mpxin afs vref1 rxin0amif2in mpxw fmrefdemc gnddem d05au1618 26 27 28 29 30 76 gndif1 77 if1agcin 78 amagc2tc 79 test2 80 mix1out2 gndvco fsu adjch amst/mp inlock 21 22 23 24 25 49 48 46 45 47 mutetc mptc qualyout fswo gndstereo 12 13 14 15 16 fmagctc s1 issstatus tv1 tv2 64 63 62 61 vcc2 ammix2out1 ammix2out2 gndvcc2 37 38 39 40 vref2 lpam lpfm lphc 44 42 41 43 vcc1 r gndvcc1 l 17 18 19 20 vccvco vcoe vcob s2 table 1. pin description pin no. pin name function 1 mix1out1 mixer tank 10.7mhz 2 test1 testing i/o pin 3 devtc deviation detector time constant 4 ammix1in am mixer1 input 5 ammix1ref am mixer1 reference 6 amrfagcout output am rf agc 7 ampindr am pin diode driver output 8 fmpindr fm pin diode driver output 9 fmmix1in1 fm mixer1 input1 10 gndrf rf ground 11 fmmix1in2 fm mixer1 input2
pins description and connection diagrams TDA7540B 6/75 12 tv1 tuning voltage preselection1 13 tv2 tuning voltage preselection2 14 issstatus iss filter status output 15 s1 free programmable switching output 16 fmagctc fm agc time constant 17 s2 free programmable switching output 18 vcob vco input base 19 vcoe vco output emitter 20 vccvco vco supply 21 gndvco vco ground 22 fsu unweighted fieldstrength output 23 adjch ident. adjacent channel output 24 amst/mp am stereo output / ident. multipath output 25 inlock pll inlock information output 26 xtalg xtal oscillator to mos gate 27 isstc1 time constant1 iss filter switch 28 isstc2 time constant2 iss filter switch 29 xtald xtal oscillator to mos drain 30 sstop search stop output 31 sda i 2 c-bus data 32 scl i 2 c-bus clock 33 fstc s-meter filtering capacitor 34 gndvcc3 vcc3 ground 35 lpout op amp output to pll loop filters 36 vcc3 supply tuning voltage 37 vref2 voltage reference for pll op amp 38 lpam op amp input to pll loop filters am 39 lpfm op amp input to pll loop filters fm 40 lphc high current pll loop filter input 41 gndvcc1 digital ground 42 r stereodecoder output right 43 l stereodecoder output left 44 vcc1 digital supply 45 fswo weighted fieldstrength output with programmable dc offset 46 qualyout stereodecoder quality output 47 gndstereo strereodecoder ground 48 mptc multipath time constant 49 mutetc weak signal mute time constant table 1. pin description (continued) pin no. pin name function
TDA7540B pins description and connection diagrams 7/75 2.3 thermal data 50 mpxin stereodecoder input 51 vccstereo stereodecoder supply 52 afs alternative frequency search drive 53 mpx/afam mpx output / am af output 54 amif2bpf am if2 bandpass filter 55 amif2ref reference voltage am if2 amplifier 56 fmrefdemc fm demodulator reference 57 gnddem ground fm demodulator 58 mpxw mpx output wit hout iss filtering 59 amif2in input am if2 60 vref1 reference 5v 61 gndvcc2 analog ground 62 ammix2out2 am tank 450khz 63 ammix2out1 am tank 450khz 64 vcc2 analog supply 65 fmmix2in fm if1 mixer2 input 66 fmmix2ref fm if1 mixer2 reference 67 amrfagctc am rf agc time constant 68 if1amp2out if1 amplifier2 output 69 amdetc am detector capacitor 70 amrefdemc am demodulator reference 71 if1amp2in if1 amplifier2 input 72 vccif1 if1 supply 73 if1amp1out if1 amplifier1 output 74 if1ref if1 amplifier reference 75 if1amp1in if1 amplifier1 input 76 gndif1 if1 ground 77 if1agcin if1 agc input 78 amagc2tc am agc2 time constant 79 test2 testing i/o pin 80 mix1out2 mixer tank 10.7mhz table 1. pin description (continued) pin no. pin name function table 2. thermal data symbol parameter value unit r th(j-amb) thermal resistance junction to ambient max. 55 c/w
electrical specifications TDA7540B 8/75 3 electrical specifications 3.1 absolute maximum ratings 3.2 electrical characteristics 3.2.1 globals table 3. absolute maximum rating symbol parameter value unit v s supply voltage 9.5 v t amb ambient temperature -40 to 85 c t stg storage temperature -55 to 150 c v esd esd protection (human body model) 1500 v v esd esd protection (machine model) 150 v v esd esd protection (change device model) 750 v table 4. electrical characteristics (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 =8.5v, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit 1 supply 1.1 v cc1 digital supply voltage 7.7 8.5 9 v 1.2 v cc2 analog supply voltage 7.7 8.5 9 v 1.3 v cc3 analog tuning voltage 7.7 8.5 9 v 1.4 v ccvco vco supply voltage 7.7 8.5 9 v 1.5 v ccmix1 mix1 supply voltage 7.7 8.5 9 v 1.6 v ccmix2 mix2 supply voltage 7.7 8.5 9 v 1.7 v ccif1 if1 supply voltage 7.7 8.5 9 v 1.8 v ccst stereo supply voltage 7.7 8.5 9 v 1.9 i cc1 supply current fm on 10 ma 1.10 i cc1 supply current am on 10 ma 1.11 i cc2 supply current fm on / vco:3 90 ma 1.12 i cc2 supply current am on 90 ma 1.13 i cc3 supply current 4.5 ma 1.14 i ccvco supply current 8 ma 1.15 i ccmix1 supply current fm on 8 ma
TDA7540B electrical specifications 9/75 3.2.2 fm section 1.16 i ccmix1 supply current am on 7 ma 1.17 i ccmix2 supply current am on 7 ma 1.18 i ccif1 supply current 5 ma 1.19 i ccst supply current 13 ma 2 reference voltages 2.1 v ref1 internal reference voltage i ref1 = 0ma 5 v 2.2 v ref2 internal reference voltage i ref2 = 0ma 2.5 v 3i 2 c-bus interface 3.1 f scl clock frequency 400 khz 3.2 v il input low voltage 1 v 3.3 v ih input high voltage 3 5 v 3.4 i in input current -5 5 a 3.5 v o output acknowledge voltage i o = 1.6ma 0.4 v table 5. electrical characteristics (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, dev= 40khz, f mod = 1khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test co nditions min. typ. max. unit 4 wide band rf agc 4.1 v 9-11 lower threshold start v 16 = 2.5v 85 db v 4.2 v 9-11 upper threshold start v 16 = 2.5v 96 db v 5 narrow band if & keying agc 5.1 v 77 lower threshold start kagc = off, v 9-11 = 0mv rms 86 db v 5.2 v 77 upper threshold start kagc = off, v 9-11 = 0mv rms 98 db v 5.3 v 77 lower threshold start with kagc kagc = max, v 9-11 = 0mv rms, ? f if =300khz 98 db v 5.4 v 22 startpoint kagc kagc = max, v 9-11 = 0mv rms, ? f if =300khz f if1 generates fs level at v 22 2.2 v 5.5 ? control range kagc ? v 22 = +0.8v 16 db 5.6 r in input resistance 10 k ? table 4. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 =8.5v, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit
electrical specifications TDA7540B 10/75 5.7 c in input capacitance 2.5 pf 6 agc time constant output 6.1 v 16 max. agc output voltage v 9-11 = 0mv rms v ref1 +v be v 6.2 v 16 min. agc output voltage v 9-11 = 50mv rms 0.5 v 6.3 i 16 min. agc charge current v 9-11 = 0mv rms ,v 16 = 2.5v -12.5 a 6.4 i 16 max. agc discharge current v 9-11 = 50mv rms ,v 16 = 2.5v 1.25 ma 7 agc pin diode driver output 7.1 i 8 agc out, current min. v 9-11 = 0mv rms , v 8 = 2.5v 50 a 7.2 i 8 agc out, current max. v 9-11 = 50 mv rms , v 8 = 2.5v -20 ma 8 i/q mixer1 (10.7mhz) 8.1 r in input resistance differential 10 k ? 8.2 c in input capacitance differential 4 pf 8.3 r out output resistance differential 100 k ? 8.4 v 9,11 input dc bias 3.2 v 8.5 g m conversion transconductance 17 ms 8.6 f noise figure 400 ? generator resistance 3 db 8.7 cp 1db 1db compression point referred to diff. mixer input 100 db v 8.8 iip3 3rd order intermodulation 122 db v 8.9 iqp i/q phase adjust ph -7 +8 8.10 irr image rejection ratio ratio wanted/image 30 40 db 8.11 irr image rejection ratio with phase adjust 40 46 db 9 if1 amplifier1 +2 (10.7mhz) 9.1 g2 gain 6 db 9.2 g1 min min. gain ifg1 9 db 9.3 g1 max max. gain ifg1 18 db 9.4 r in input resistance 330 w 9.5 r out output resistance 330 w 9.6 cp 1db 1db compression point referred to 330 ? input 105 db v 9.7 iip3 3rd order intermodulation ref. to 330 ? input, 9db gain 126 db v 10 mixer2 (450khz) 10.1 r in input impedance 330 ? 10.2 v 65 max. input voltage 119 db v table 5. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, dev= 40khz, f mod = 1khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test co nditions min. typ. max. unit
TDA7540B electrical specifications 11/75 10.3 v 65 limiting sensitivity s/n = 20db 28 db v 10.4 g mixer gain 18 db 11 limiter 1 (450khz) 11.1 g limiter gain 80 db 12 demodulator, audio output 12.1 thd dev.= 75khz, v 65 = 10mv rms 0.1 % 12.2 v mpx mpx output signal dev.= 75khz 500 mv rms 12.3 r out output impedance 50 ? 12.4 | ? v| min dc offset fine adjust dem, mena=1 8.5 mv 12.5 | ? v| max dc offset fine adjust dem, mena=1 264 mv 12.6 s/n dev.= 40khz,v 65 = 10mv rms 76 db 12.7 v mpxw mpxw output signal dev.= 75khz 350 mv rms 13 quality detection s-meter, unweighted fieldstrength 13.1 v 65 min. input voltage mix2 30 db v 13.2 v 22 fieldstrength output v 65 = 20db v0.1v 13.3 v 22 fieldstrength output v 65 = 119db v4.9v 13.4 ? v 22 voltage per decade smsl = 0 1 v 13.5 ? v 22 voltage per decade smsl = 1 1.5 v 13.6 ? v 22 s-meter offset sl, smsl=1 -15 15 db 13.7 r out output impedance 400 ? 13.8 tk temp coeff. 0 ppm/k adjacent channel gain 13.9 g min gain minimum acg=0 32 db 13.10 g max gain maximum acg=1 38 db adjacent channel filter 13.11 f hp -3db frequency highpass acf=0 100 khz 13.12 f bp centre frequency acf=1 100 khz 13.13 f -20db attenuation 20db 70 khz adjacent channel output 13.14 v 23 output voltage low 0.1 v 13.15 v 23 output voltage high 4.9 v table 5. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, dev= 40khz, f mod = 1khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test co nditions min. typ. max. unit
electrical specifications TDA7540B 12/75 13.16 r out output resistance 4 k ? multipath channel gain 13.17 g min gain minimum mpg=0 12 db 13.18 g max gain maximum mpg=1 23 db multipath bandpass filter 13.19 f bp19 centre frequency mpf=0 19 khz 13.20 f bp31 centre frequency mpf=1 31 khz 13.21 q quality factor 5 8 10 multipath output 13.22 v 24 output voltage low 0.1 v 13.23 v 24 output voltage high 4.9 v 13.24 r out output resistance 2.5 k ? 14 iss (intelligent selectivity system) filter 450khz 14.1 f centre centre frequency f ref_intern = 450khz 450 khz 14.2 bw 3db bandwidth, -3db iss80 = 1 80 khz 14.3 bw 20db bandwidth, -20db iss80 = 1 150 khz 14.4 bw 3db bandwidth, -3db iss80 = 0 120 khz 14.5 bw 20db bandwidth, -20db iss80 = 0 250 khz 14.6 bw 3db bandwidth weather band iss30 = 1 30 khz 14.7 bw 20db -20db weather band iss30 = 1 80 khz adjacent channel iss filter threshold 14.8 v nth internal low threshold acnth 0 v 14.9 v nth internal high threshold acnth 0.3 v 14.10 v wth internal low threshold acwth 0.25 v 14.11 v wth internal high threshold acwth 0.95 v multipath threshold 14.12 v thmp internal low threshold mpth 0.50 v 14.13 v thmp internal high threshold mpth 1.25 v iss filter time constant 14.14 i 27 ,i 28 charge current low mid tiss, issctl = 1 -74 a 14.15 i 27 ,i 28 charge current high mid tiss, issctl = 1 -60 a 14.16 i 27 ,i 28 charge current low narrow tiss, issctl = 1 -124 a table 5. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, dev= 40khz, f mod = 1khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test co nditions min. typ. max. unit
TDA7540B electrical specifications 13/75 14.17 i 27 ,i 28 charge current high narrow tiss, issctl = 1 -110 a 14.18 i 27 ,i 28 discharge current low tiss, issctl = 0 1 a 14.19 i 27 ,i 28 discharge current high tiss, issctl = 0 15 a 14.20 v 27 ,v 28 low voltage issctl = 0 0.1 v 14.21 v 27 ,v 28 high voltage issctl = 1 4.9 v iss filter switch threshold 14.22 v 27 ,v 28 threshold iss on issctl = 0 3 v 14.23 v 27 ,v 28 threshold iss off issctl = 0 1 v 14.24 v 27 ,v 28 threshold iss narrow on issctl = 0 4 v 14.25 v 27 ,v 28 threshold iss narrow off issctl = 0 2 v 14.26 i 3 charge current low tdev -25 a 14.27 i 3 charge current high tdev -39 a 14.28 i 3 discharge current low tdev 1 a 14.29 i 3 discharge current high tdev 15 a 14.30 dev wth internal low threshold dwth 30 khz 14.31 dev wth internal high threshold dwth 75 khz 14.32 ratio min referred to threshold dth 1 14.33 ratio max referred to threshold dth 1.5 15 softmute 15.1 v ant upper startpoint smth, smd, slope = 0 10 db v 15.2 v ant lower startpoint smth, smd, slope = 0 3 db v 15.3 a smmin min. softmute depth smd, slope = 0, smth upper 18 db 15.4 a smmax max. softmute depth smd, slope = 0, smth upper 36 db 15.5 a smthiss mute depth threshold for iss filter on smcth 0.2 1 2 db 15.6 v acth internal ac mute threshold acm 60 340 mv 15.7 a smac ac mute depth acmd 4 10 db 15.8 i 49 charge current -47.5 a 15.9 i 49 discharge current 2.5 a 16 s/n mpx 16.1 (s+n)/n v ant = 60db v, dev.= 40khz,lp=15khz deemphasis t = 50 s 66 69 db table 5. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, dev= 40khz, f mod = 1khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test co nditions min. typ. max. unit
electrical specifications TDA7540B 14/75 3.2.3 am section table 6. electrical characteristics (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, m= 30%, f mod = 400khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit 17 global 17.1 v ant_us usable sensitivity (s+n)/n = 26 db 25 19 db v 17.2 ? v ant if2 agc range ref.: v inrf = 60db v, 50 52 db 17.3 (s+n)/n signal to noise ratio ref.: v inrf = 60db v5055 db 17.4 a if if rejection ref: v inrf = 60db v, if = 10.7mhz 70 80 db 17.5 f af frequency response ref.: v inrf = 60db v, ? v af = -3 db 3.6 khz 17.6 thd total harmonic distortion v inrf = 60db v, m = 0 . 8 m = 0.3 v inrf = 120 db v, m = 0 . 8 m = 0.3 0.5 0.3 1.0 0.3 % 17.7 v 53 af output level v inrf = 60db v 190 mv rms 17.8 v 24 if output level v inrf = 60db , m=off 190 mv rms 17.9 v 4 min. rf agc threshold max. rf agc threshold wagc 90 109 db v db v 17.10 v 71 min. if agc threshold max. if agc threshold wagc 90 109 db v db v 17.11 v 71 min. dagc threshold max. dagc threshold dagc 74 96 db v db v 17.12 | i 78max | agc2 charge current seek 160 a 17.13 ccr charge current ratio seek/seek off 30 18 agc voltage driver output 18.1 v 6 max. agc output voltage 3.5 v 18.2 v 6 min. agc output voltage 0.5 v 18.3 | i 6 | agc current 100 a 19 agc pin diode driver output 19.1 i 7 agc driver current -2 ma 20 am mixer1 (10.7mhz) 20.1 r in input resistance differential 100 k ? 20.2 c in input capacitance differential 4 pf 20.3 r out output impedance differential 100 k ?
TDA7540B electrical specifications 15/75 20.4 cp 1db 1db compression point referred to diff. mixer input 112 db v 20.5 iip3 3rd order intermodulation 132 db v 20.6 f noise figure 8 db 20.7 a gain 26 db 20.8 c min min. capacitance step if1t 0.55 pf 20.9 c max max. capacitance if1t 8.25 pf 20.10 c 1-80 if1t 2 pf 21 am mixer2 (450khz) 21.1 r 71 input resistance 330 w 21.2 c 71 input capacitance 2.5 pf 21.3 cp 1db 1db compression point referred to diff. mixer input 120 db v 21.4 iip3 3rd order intermodulation 132 db v 21.5 f noise figure 12 db 21.6 a max. gain mixer2 tank output 34 db 21.7 ? a gain control range 20 db 21.8 c min min. cap step if2t 1.6 pf 21.9 c max max. cap if2t 24 pf 21.10 c 62-63 if2t 2 pf 22 if noise blanking 22.1 t bl min. blanking time 8 s 22.2 t bl max. blanking time 17 s 22.3 v th min internal threshold 0 mv 22.4 v th max. internal threshold 187.5 mv 22.5 v thstep threshold step 12.5 mv 22.6 v desth min. desensitivity threshold 3.2 v 22.7 v desth max. desensitiv ity threshold 4 v table 6. electrical characteristics (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, m= 30%, f mod = 400khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit
electrical specifications TDA7540B 16/75 3.2.4 stereodecoder table 7. electrical characteristics (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, v mpx = 500mv rms mono, f = 1khz, deemphasis = 50 s, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit 23 stereodecoder 23.1 v in mpx input level std gain = 2,5 db 0.5 0.93 v rms 23.2 r in input resistance 100 k ? 23.3 g min min. stereodecoder gain 0 db 23.4 g max max. stereodecoder gain 3.75 db 23.5 g step stereodecoder gain step resolution 1.25 db 23.6 svrr supply voltage ripple rejection vripple = 100mv, f = 1khz 60 db 23.7 a max. channel separation v mpx = 500mv rms stereo only l/r 50 db 23.8 thd total harmonic distortion 0.02 0.3 % 23.9 (s+n)/n signal plus noise to noise ratio a-weighted, 19khz notch 85 db 23.10 v puafs pull up voltage for afs pin 3.3 v 23.11 r puafs pull up resistor for afs pin 25 k ? 23.12 v th1 1. threshold for afs pin 2.4 v 23.13 v th2 2. threshold for afs pin 0.8 v 24 mono/stereo-switch 24.1 v pthst1 pilot threshold voltage for mono->stereo, pth = 1 10 mv rms 24.2 v pthst0 pilot threshold voltage for mono->stereo, pth = 0 14 mv rms 24.3 v pthmo1 pilot threshold voltage for stereo->mono, pth = 1 8 mv rms 24.4 v pthmo0 pilot threshold voltage for stereo->mono, pth = 0 12 mv rms 25 19khz pll 25.1 f lock pll lock range pilot magnitude 20 mv rms = 4% 18.9 19.1 khz 25.2 dp pilot deviation pilot frequency 19khz 4 30 % 26 deemphasis- and highcut 26.1 t hc50 deemphasis time constant deemp = 0, desft = 1 v level >> v hch 50 s 26.2 t hc75 deemphasis time constant deemp = 1, desft = 1 v level >> v hch 75 s
TDA7540B electrical specifications 17/75 26.3 t hc25 deemphasis time constant deemp = 0, desft = 0 v level >> v hch 25 s 26.4 t hc37 deemphasis time constant deemp = 1, desft = 0 v level >> v hch 37.5 s 26.5 t hc50 highcut time constant deemp = 0, desft = 1 v level << v hcl 150 s 26.6 t hc75 highcut time constant deemp= 1, desft = 1 v level << v hcl 225 s 26.7 f amcmin min. am corner frequency deemp = 0, desft = 1 amcf 1.06 khz 26.8 f amcmin max. am corner frequency deemp = 0, desft = 1 amcf 3.18 khz 27 stereoblend- and highcut-control 27.1 l gmin min. level gain lg 0 db 27.2 l gmax max. level gain lg 4.7 db 27.3 l gstep level gain step resolution lg 0.67 db 27.4 vsbl min min. voltage for mono sbc 29 %v ref1 27.5 vsbl max max. voltage for mono sbc 58 %v ref1 27.6 vsbl step step resolution sbc 4.2 %v ref1 27.7 vhch min min. voltage for no highcut vhch 42 %v ref1 27.8 vhch max max. voltage for no highcut vhch 66 %v ref1 27.9 vhch step step resolution vhch 8 %v ref1 27.10 vhcl min min. voltage for full high cut vhcl, maxhc = 00 11 %vhch 27.11 vhcl max max. voltage for full high cut vhcl, maxhc = 00 33 %vhch 27.12 vhcl step step resolution vhcl, maxhc = 00 7.3 %vhch 28 carrier and harmonic suppression at the output 28.1 a19 pilot signal f=19khz v pilot = 50mv rms 50 db 28.2 a38 subcarrier f=38khz 75 db 28.3 a57 subcarrier f=57khz 62 db 28.4 a76 subcarrier f=76khz 90 db 29 intermodulation (note 1) 29.1 a2 f mod =10khz, f spur =1khz 65 db 29.2 a3 f mod =13khz, f spur =1khz 75 db table 7. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, v mpx = 500mv rms mono, f = 1khz, deemphasis = 50 s, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit
electrical specifications TDA7540B 18/75 30 traffic radio (note 2) 30.1 a57 signal f=57khz 70 db 31 sca - subsidiary communicat ions authorization (note 3) 31.1 a67 signal f=67khz 75 db 32 aci - adjacent channel interference (note 4) 32.1 a114 signal f=114khz 95 db 32.2 a190 signal f=190khz 84 db 33 fm noise blanker 33.1 v trmin min. trigger threshold 0) v peak =0.8v, nblth 147 mv op 33.2 v trmax max. trigger threshold 0) v peak =0.8v, nblth 280 mv op 33.3 v trstep trigger threshold step 0) 19 mv op 33.4 v trnoise min. noise controlled trigger threshold 0) v peak =1.5v, nbcth 450 mv op 33.5 v trnoise max. noise controlled trigger threshold 0) v peak =1.5v, nbcth 1200 mv op 33.6 v peak peak voltage nbrr = 00, v mpx =0mv 0.8 v 33.7 v peak peak voltage v mpx =50mv, f=150khz 1.9 v 33.8 v peak peak voltage v mpx =200mv, f=150khz 3.5 v 33.9 v peakdev min. deviation dependent peak voltage v mpx =500mv, nbdth = 11 0.8 (off) v op 33.10 v peakdev max. deviation dependent peak voltage v mpx =500mv, nbdth= 00 2.0 v op 33.11 v peakfs min. fieldstrength controlled peak voltage v mpx =0mv, v level << v sbl (fully mono), nbfs = 11 0.8 (off) v 33.12 v peakfs max. fieldstrength controlled peak voltage v mpx =0mv, v level << v sbl (fully mono), nbfs = 00 2.0 v 33.13 t s min. blanking time signal holdn in testmode, nbt 22 s 33.14 t s max. blanking time signal holdn in testmode, nbt 38 s 33.15 sr peak noise rectifier charge signal peak in testmode, nbpc=0 10 mv/ s 33.16 sr peak noise rectifier charge signal peak in testmode, nbpc=1 20 mv/ s table 7. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, v mpx = 500mv rms mono, f = 1khz, deemphasis = 50 s, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit
TDA7540B electrical specifications 19/75 33.17 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=00, nbsmp=0, mppc=0 0.3 v/ms 33.18 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=01, nbsmp=0, mppc=0 0.8 v/ms 33.19 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=10, nbsmp=0, mppc=0 1.3 v/ms 33.20 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=11, nbsmp=0, mppc=0 2.0 v/ms 33.21 v adjmp noise rectifier adjustment by multipath signal peak in testmode, v mptc =1v, nbsmp=0, mppc=1 tbd v/ms 33.22 v adjmp noise rectifier adjustment by strong multipath influence signal peak in testmode, v mptc =1v,, nbsmp=1, mppc=0 tbd v/ms 33.23 v adjmp noise rectifier adjustment by multipath and strong multipath influence signal peak in testmode, v mptc =1v,, nbsmp=1, mppc=1 tbd v/ms 33.24 g amdelay am delay filter atte nuation f = 2.2khz 2 db 34 multipath detector 34.1 f cmp center frequency of multipath-bandpass stereo decoder locked on pilot tone 19 khz 34.2 g bpmp min. band pa ss gain mpbpg 6 db 34.3 g bpmp max. band pass gain mpbpg 12 db 34.4 g rectmp min. rectifier gain mprg 0 db 34.5 g rectmp max. rectifier gain mprg 7.6 db 34.6 i chmp rectifier charge current mpcc = 0 0.8 a 34.7 i chmp rectifier charge current mpcc = 1 0.4 a 34.8 i dismp rectifier discharge current 1 ma 35 quality detector 35.1 a min. mp influence factor qdc 0.6 35.2 a max. mp influence factor qdc 1.05 35.3 a min. noise influence factor qng 6 db 35.4 a max. noise influence factor qng 15 db table 7. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, v mpx = 500mv rms mono, f = 1khz, deemphasis = 50 s, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit
electrical specifications TDA7540B 20/75 1. intermodulation suppression a 2 = v o (signal,@1khz) / v o (spurious, @1khz) ; fs = (2x10khz) - 19khz a 3 = v o (signal,@1khz) / v o (spurious, @1khz) ; fs = (3x13khz) - 38khz measured with: 91% stereo signal; 9% pilot signal; fm = 10khz or 13khz. 2. traffic radio (v.f.) suppression a 57(v,w,f) = v o (signal,@1khz) / v o (spurious, @1khz+/-23khz) measured with: 91% stereo signal; 9% pilot signal; fm=1khz; 5% sub carrier (f=57khz, fm=23hz am, m=60%) 3. sca ( subsidiary commun ications authorization ) a 67 = v o (signal,@1khz) / v o (spurious, @9khz) ; fs = (2x38khz) - 67khz measured with: 81% mono signal; 9% pilot signal; fm=1khz; 10%sca ? sub carrier ( f s = 67khz, unmodulated ). 4. aci ( adjacent channel interference ) a 114 = v o (signal,@1khz) / v o (spurious, @4khz) ; fs = 110khz - (3x38khz) a 190 = v o (signal,@1khz) / v o (spurious, @4khz) ; fs = 186khz - (5x38khz) measured with: 90% mono signal; 9% pilot signal; fm=1khz; 1% spurious signal ( f s = 110khz or 186khz, unmodulated). 0 ) all thresholds are measured intestmode at the quality output. the thresholds are calculated by v nbth - v peak v peak is adjusted by applying a 150khz sinewave at mpxin.
TDA7540B electrical specifications 21/75 figure 3. trigger threshold vs. v peak figure 4. deviation controlled trigger adjustmen t figure 5. field strength controlled trigger adjustment vth min. trig. t hreshold noise controlled trig. threshold 0.8 v 1200 mv (00) 950 mv (01) 700 mv (10) 450 mv (11) 8 steps 200 mv 147 mv v peak 1.5 v 0.8 deviation [khz] 2.0 1.5 1.0 20 32.5 45 75 v peak 00 01 10 detector off 11 [v ] op 0.8v noisy signal good signal noise 2.0v (00) mono stereo 1.6v (01) 1.4v (10) atc_sb off (11) e' v peak 3v
electrical specifications TDA7540B 22/75 3.2.5 pll section table 8. electrical characteristics (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, dev. = 40khz, f mod = 1khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit 36 output of tuning voltages (tv1,tv2) 36.1 v out output voltage tvo 0.5 v cc3 -0.5 v 36.2 r out output impedance tvmode=0 40 k ? 36.3 r out output impedance tvmode=1 20 k ? 37 xtal reference oscillator 37.1 f lo reference frequency c load = 15pf 10.25 mhz 37.2 c step min. cap step xtal 0.75 pf 37.3 c max max. cap xtal 23.25 pf 37.4 ? f/f deviation versus vcc2 ? v cc2 = 1v 1.5 ppm/v 37.5 ? f/f deviation versus temp -40c < t < +85c 0.2 ppm/k 38 loop filter input/output 38.1 -i in input leakage current v in = gnd, pd out = tristate -0.1 0.1 a 38.2 i in input leakage current v in = vref1 pd out = tristate -0.1 0.1 a 38.3 v ol output voltage low i out = -0.2ma 0.05 0.5 v 38.4 v oh output voltage high i out = 0.2ma v cc3 - 0.5 v cc3 - 0.05 v 38.5 i out output current, sink v out = 1v to v cc3 -1v 10 ma 38.6 i out output current, source v out = 1v to v cc3 -1v -10 ma 39 voltage controlled oscillator (vco) 39.1 f vcomin minimum vco frequency 50 mhz 39.2 f vcomax maximum vco frequency 260 mhz 39.3 c/n carrier to noise f vco = 200mhz, ? f=1khz, b=1hz, closed loop 80 dbc 40 sstop, inlock, issstatus outputs (ope n collector) 40.1 v output voltage low i = -200 a0.20.5v 40.2 v output voltage high 5 v 40.3 -i output leakage current v = 5v -0.1 0.1 a 40.4 i output current, sink v = 0.5v-5v 1 ma 41 switching outputs s1, s2 (open collector smode=1) 41.1 v output voltage low i = -5ma 0.2 0.5 v
TDA7540B electrical specifications 23/75 41.2 v output voltage high v cc1 v 41.3 -i output leakage current v = 5v -3 3 a 41.4 i output current, sink v = 0.5v-v cc 5ma 42 switching outputs s1, s2 (open emitter smode=0) 42.1 v output voltage low i = 0 a0v 42.2 v output voltage high i = 1ma v cc1 - 1 v 42.3 -i output leakage current -0.1 0.1 a 42.4 i output current, sink v = 5v 5 ma table 8. electrical characteristics (continued) (t amb = 25c, v cc1 = v cc2 = v cc3 = v ccst = v ccvco = v ccmix1 = v ccmix2 = v ccif1 = 8.5v, f rf = 98mhz, dev. = 40khz, f mod = 1khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified). item symbol parameter test conditions min. typ. max. unit
functional description TDA7540B 24/75 4 functional description 4.1 fm section 4.1.1 mixer1, agc and 1.if fm quadrature i/q-mixer converts fm rf to if1 of 10.7mhz. the mixer provides inherent image rejection and wide dynamic range with low noise and large input signal performance. the mixer1 tank can be adjusted by software (if1t). for accurate image rejection the phase-error of i/q can be compensated by software (ph) it is capable of tuning the us fm, us weather, europe fm, japan fm and east europe fm bands ? us fm = 87.9 to 107.9 mhz ? us weather = 162.4 to 162.55 mhz ? europe fm = 87.5 to 108 mhz ? japan fm = 76 to 91 mhz ? east europe fm = 65.8 to 74 mhz the agc operates on different sensitivities and bandwidths in order to improve the input sensitivity and dynamic range. agc thresholds are programmable by software (rfagc,ifagc,kagc). the output signal is a controlled current for pin diode attenuator. a 10.7mhz programmable amplifier (ifg1) correct the if ceramic insertion loss and the costumer level plan application. 4.1.2 mixer2, limiter and demodulator in this 2nd mixer stage the first 10.7mhz if is converted into the second 450khz if. a multi- stage limiter generates signals for the complete integrated demodulator including spike cancellation (dnb). mpx output dc offset versus noise dc level is correctable by software (dem), if tuner softmute is activated. 4.1.3 quality detection and iss fieldstrength parallel to mixer2 input a 10.7mhz limiter generates a signal for digital if counter and a fieldstrength output signal. this internal unwei ghted fieldstrength is used for keying agc, adjacent channel and multipath detection and is available at pin22 (fsu) after +6db buffer stage. it is possible to combinate the if counter result with this fsu via programmable comparator (ssth). the behaviour of fsu signal can be corrected for dc offset (sl) and slope (smsl). the generated unweighted fieldstr ength is externally filtered and used for softmute function and generation of iss filter switching signal for weak input level (sm). adjacent channel detector the input of the adjacent channel detector is ac coupled from internal unweighted fieldstrength. a programmable highpass or bandpass (acf) and amplifier (acg) as well as rectifier determines the influen ces. this voltage is compared with adjustable comparator1 thresholds (acwth, acnth). the output signal of this comparator generates a dc level at pin27 by programmable time constant. time control (tiss) for a present adjacent channel
TDA7540B functional description 25/75 is made by charge and discharge current after comparator1 in an external capacitance. the charge current is fixed and the discharge current is controlled by i 2 c bus. this level produces digital signals (ac, ac+) in an additional comparator4. the adjacent channel information is available as analog output signal after rectifier and +8db output buffer. multipath detector the input of the multipath detector is ac coupled from internal unweighted fieldstrength. a programmable bandpass (mpf) and amplifier (mpg) as well as rectifier determines the influences. this voltage is compared with an adjustable comparator2 thresholds (mpth). the output signal of this comparator2 is used for the "milano" effect. in this case the adjacent channel detection is switched off. the "milano" effect is selectable by i 2 c bus (mpoff). the multipath information is available as analog output signal after rectifier and +8db output buffer. 450khz if narrow bandpass filter (iss filter) the device gets an additional 450khz if narrow bandpass filter for suppression of noise and adjacent channel signal influences. this narrow filter has three switchable bandwidthes, narrow range of 80khz, mid range of 120khz and 30khz for weather band information. without iss filter the if bandwidth (wide range) is defined only by ceramic filter chain. the filter is located between mixer2 and 450khz limiter stage. the centre frequency is matched to the demodulator center frequency. deviation detector in order to avoid distortion in audio output signal the narrow iss filter is switched off for present overdeviation. hence the demodulator ou tput signal is detected. a lowpass filtering and peak rectifier generates a signal that is defined by software controlled current (tdev) in an external capacitance. this value is compared with a programmable comparator3 thresholds (dwth, dth) and generates two digital signals (dev, dev+). for weak signal condition deviation threshold is dependent on fswo. iss switch logic all digital signals coming from adjacent channel detector, deviation detector and softmute are acting via switching matrix on iss filter switch. the if bandpass switch mode is controlled by software (isson, iss30, iss80, ctloff). the switch on of the if bandpass is also available by external manipulation of voltage at pin27. two application modes are available (appm). the conditions are described in table 51. 4.1.4 soft mute control the filtered fieldstrength (fswo) signal is the reference for mute control. the startpoint and mute depth are programmable (smth, smd) in a wide range. the time constant is defined by external capacitance. additional adjacen t channel mute function is supported. a highpass filter with -3db threshold frequency of 100khz, amplifier and peak rectifier generates an adjacent noise signal from mpx output with the same time constant for softmute. this value is compared with comparator5 thresholds (acm). for present strong adjacent channel the mpx signal is additional attenuated (acmd).
functional description TDA7540B 26/75 4.2 am section the up/down conversion is combined with gain control circuit sensing three input signals, narrow band information at pin 54, upconversion signal (if2agc) at pin 71and wide band information (rfagc) at pin 4.this gain control gives two output signals. the first one is a current for pin diode attenuator and the second one is a voltage for preamplifier. time constant of rf- and if-agc is defined by internal 100k resistor and external capacitor at pin 67. the intervention points for agc (dagc,wagc) are programmable by software. in order to avoid a misbehaviour of agc intervention point it is important to know that the dagc threshold has to be lower than wagc threshold ! the oscillator frequency for upconversion-mixer1 is generated by dividing the vco frequency after vco divider (vcod) and am predivider(amd). two 10,7mhz ceramic filters before mixer2 input increases 900khz attenuation.in mixer2 the if1 is down converted into the if2 450khz. after filtering by ceramic filter a 450khz amplifier is included with an additional gain control of if2 below dagc threshold. time constant is defined by capacitance at pin 78. mixer1 and mixer2 tanks are software controlled adjustable (if1t, if2t). the demodulator is a peak detector to generate the audio output signal. a separate output is available for amif stereo (amst). am if noise blanker in order to remove in am short spikes a noise cancellation conception is used in 450khz if am level. the advantage is to avoid long narrow agc- and demodulator- time constants, wich enlarge spike influences on audio signal a nd makes difficult to remove it in audio path. the 10,7mhz am if signal generates before 10,7 mhz ceramic filter via limitation an unweighted fieldstrenght signal including slope of noise spike. the comparison of these detected slope between fast and slow rectifier ignores audio modulation whereby the threshold of slow rectifier is programmable (ainbt). a comparator activates a pulse generator. the duration of this pulse is software programmable (aint) and is smooth blanking out the spikes in 450khz am mixer2. additionally th is funtionality is cont rolled by narrow am fieldstrenght (ainbd). 4.3 stereodecoder 4.3.1 decoder the stereo decoder-part of the tda7540 (see fig. 14) contains all functions necessary to demodulate the mpx-signal like pilot tone-dependent mono/stereo-switching as well as "stereoblend" and "highcut". adaptations like programmable input gain, roll-off compensation, selectable deemphasis time constant and a programmable field strength input allow easy adaption to different applications. the 4.th order input filter has a corner frequency of 80khz and is used to attenuate spikes and noise and acts as an anti-aliasing filt er for the following swit ch capacitor filters.
TDA7540B functional description 27/75 demodulator in the demodulator block the left and the right channel are separated from the mpx-signal. in this stage also the 19-khz pilot tone is ca nceled. for reaching a high channel separation the tda7540 offers an i2c-bus programmable roll-off adjustment, which is able to compensate the low pass behavior of the tuner section. within the compensation range an adjustment to obtain at least 40db channel separation is possible. the bits for this adjustment are located together with the level gain adjustment in one byte. this gives the possibility to perform an optimization step dur ing the producti on of the car radio where the channel separation and the field strength control are trimmed. in addition to that the fm signal can be inverted. deemphasis and highcut the deemphasis low pass allows to choose between a time constant of 50s/ 75 s (deemp) and 25 s/37.5 s (desft). the highcut control range will be in both cases hc = 2x deemp . inside the highcut contro l range (between vhch and vhcl) the level signal is converted into a 5-bit word, which controls the low pass time constant between deemp ...3x deemp . thereby the resolution will remain al ways 5 bits independently of the absolute voltage range between the vhch- and vhcl-values. the highcut function can be switched off by i 2 c-bus . in am mode (amon = 1) the bits deemp and desft together with the am corner frequency bits (amcf1...5) can be used as programmable am frequency response. the maximum corner frequency is defined by deemp , the minimum is defined by 3x deemp 19khz pll and pilot tone detector the pll has the task to lock on the 19khz pilot tone during a stereo-transmission to allow a correct demodulation. the included pilot tone-detector enables the demodulation if the pilot tone reaches the selected pilot tone threshold v pthst . two different thresholds are available. by reading the status byte of the tda7540 via i2c-bus the detector output can be checked. field strength control the field strength input is used to control the highcut- and the stereoblend-function. in addition the signal can be also used to control the noise blanker thresholds and as input for the multipath detector. level-input and -gain as level input for the stereo decoder is used the fsu voltage (pin22). appling a capacitor at fstc (pin33) a desired time constant can by reached together with the internal resistor of 10k between fsu pin and fstc pin. in addition to that the level signal is low pass filtered inte rnally in order to suppress undesired high frequency modulation on the highcut- and stereoblend-function . the filter is a combination of a 1.st-order rc-low pass at 53khz (working as anti-aliasing filter) and a 1.st-order switched capacitor low pass at 2.2khz. the second stage is a programmable gain stage to adapt the level signal internally . the gain is widely programmable in 8 steps from 0db to 4,7db (step=0.67db). these 3bits are located together with the roll-off bits in the "stereo decoder 8"-byte to simplify a possible adaptation during the production of the car radio.
functional description TDA7540B 28/75 stereoblend control the stereoblend control block converts the internal level-voltage into a demodulator compatible analog signal, which is used to control the channel separation between 0db and the maximum separation. internally this control range has a fixed upper limit, which is the internal reference voltage v ref1 . the lower limit can be programmed between 29 and 58% of v ref1 in 4% steps (see fig.6). to adjust the external level-vol tage to the internal range tw o values must be defined: the level gain l g and vsbl. to adjust the voltage where the full channel separation is reached (vst) the level gain l g has to be defined. the following equation can be used to estimate the gain: l g = v ref1 /fsu@full stereo the mono-voltage vmo (0db channel separation) can be chosen selecting vsbl. figure 6. relation between internal and external level-voltagees and setup of stereoblend the stereo blend function can be switched on/off using bit addr25. please note that in am it must be switched in forced mono! highcut control the highcut control set-up is similar to the stereoblend control set-up: the starting point vhch can be set with 2 bits to be 42, 50, 58 or 66% of vref1 whereas the range can be set to be 11, 18.3, 25.7 or 33% of vhch (see fig. 7).
TDA7540B functional description 29/75 figure 7. highcut characteristics 4.3.2 functional descripti on of the noise blanker in the automotive environment spikes produced by the ignition or for example the wiper- motor disturb the mpx-signal. the aim of the no ise blanker part is to cancel the audible influence of the spikes. therefore the output of the stereo decoder is held at the actual voltage for a time between 22 s and 38 s (programmable). the block diagram of the noise blanker is given in fig.15. in a first stage the spikes must be detected but to avoid a wrong triggering on high frequency (white) noise a complex trigger control is implemented. behind the trigger stage a pulse former generates the "blanking"-pulse. an own biasing circuit supplies the noise blanker in order to avoid any cross talk to the signal path. trigger path the incoming mpx signal is high pass filtered, amplified and rectified. this second order high pass filter has a corner-frequency of 140khz. the rectified signal, rect, is low pass filtered to generate a signal called peak. also noise with a frequency 140khz increases the peak voltage. the resulting volta ge can be adjusted by use of the noise rectif ier discharge current. the peak voltage is fed to a threshol d generator, which adds to the peak-voltage a dc-dependent thresh old vth. both signals, re ct and peak+vth are fed to a comparator, which triggers a re-triggerable monoflop. the monoflop's output activates the sample-and-hold circuits in the signal path for the selected duration. automatic noise controlled threshold adjustment (see figure 3 ) there are mainly two independent possibilities for prog ramming the trig ger threshold: 1. the low threshold in 8 steps (nblth) 2. and the noise adjusted threshold in 4 steps (nbcth). the low threshold is active in combination with a good mpx signal without any noise; the peak voltage is less than 1v. the sensit ivity in this operation is high. if the mpx signal is noisy (low fieldstrength) the peak voltage increas es due to the higher noise, which is also rectified. with increa sing of the peak voltage the trigger threshold increases, too. this particular gain is programmable in 4 steps (nbcth). l ow p a s s t i me c o n s t a n t v hcl v hc hf i e l d s t r e n g t h 3 ? d eem p t d eem p
functional description TDA7540B 30/75 automatic threshold control by the stereoblend voltage (see figure 5 ) besides the noise controlled th reshold adjustment there is an additional possibility for influencing the noise blanker trigger threshold using the bits nbfs. this influence depends on the stereoblend control. the point where the mpx signal starts to become noisy is fixed by the rf part. this point is also the starting point of the normal noise-controlled trigger adjustment. but in some cases the noise blanker can create a wrong triggering, which create distortion, already in the region of mono/stereo tr ansition. therefore a opportunity to control the peak voltage by the stereo blend function it is implemented. over deviation detector (see figure 4 ) if the system is tuned to stations with a high deviation the noise blanker can trigger on the higher frequencies of the modulation. to avoid this wrong behavior, which causes noise in the output signal, the noise blanker offers a deviation-dependent threshold adjustment. by rectifying the mpx signal a further signal repres enting the actual deviation is obtained. it is used to increase the peak voltag e. offset and gain of this circuit are programmable in 3 steps (nbdth) of the stereo decoder-byte (the first step turns off the detector). multipath-level to react on high repetitive spikes caused by a multipath-situation, the discharge-time of the peak voltage can be decreased depending on the volt age-level at pin mpout. there are two ways to do this. one way is to switch on the linear influence of the multipath-level on the peak-signal . in this case the discharge slew rate is 1v/ms (a) . the second possibility is to activate a function, which switches to the 18k discharge if the multipath-level is below 2.5v. am mode of noise blanker the tda7540 offers an am audio noise blanker too. if the am noise blanker is used the am audio delay filter must be switched on. it is not recommented to use the am noise blanker without to use the amif noiseblanker inside the tuner. together with the if am moise blanker, this audio noise blanking can work in two different modes. mode 1 uses the same threshold controls like in fm mode. the detector uses in am mode the audio input for spike detection. a combination of programmable gain stage and low pass filtering forms an envelope detector wich drives the noise blanker input via 10/20khz, 1st/2nd order high pass filter. in mode 2 only a fixed noise blanker threshold is used. in order to blank the whole spike in am mode the hold time of the s&h circuit is much longer than in fm mode (640 s -1,2ms) 4.3.3 functional description of the multipath-detector using the internal multipath-detector the audible effects of a multipath condition can be minimized. a multipath-condition is detected by rectifying the 19khz spectrum in the fieldstrength signal. an external capacitor is used to define the attack- and decay-times (see a. the slew rate is measured with rdischarge=infinite and vmpout=2.5v
TDA7540B functional description 31/75 block diagram, fig. 16). the mp_out-pin is used as detector-output connected to a capacitor of about 47nf. using this configur ation an external adaptation to the user's requirement is possible without affecting the "normal" fieldstrength input (level) for the stereo decoder. to keep the old value of the multipath detector during an af-jump, the mp-hold switch can disconnect the external capacitor. this s witch is controlled dire ctly by the afs-pin. selecting mpion the channel separation is automatically reduced during a multipath condition according to the voltage appearing at the mp_out-pin. programming to obtain a good multipath performance an adaptation is necessary. therefore the gain of the first 19khz-bandpass is programmable in two steps (mpg), the gain of the second 19khz-bandpass is programmable in four steps (mpbpg) an d the rectifier gain is programmable in four steps(mprg). please note that the frequency of the first multipath bandpass (mpf) must be set to 19khz! the attack- and decay-times can be set by the external capacitor value and the multipath detector charge current mpcc. 4.3.4 quality detector the tda7540 offers a quality detector output, which gives a voltage representing the fm- reception conditions. to calculate this voltage the mpx-noise and the multipath-detector output are summed according to the following formula: v qual = 0.8b (v noise -0.8 v)+ a (v ref1 -v mpout ). the noise-signal is the peak-si gnal without additional infl uences (see noise blanker description). the factor 'a' can be programmed from 0.6 to 1.05(qdc) and the factor b can be programmed from 6db to 15db ( qng). the output is a low impedance output able to drive external circuitry as well as simply fed to an ad-converter for rds applications. 4.3.5 afs control and stereo decoder mute the tda7540 is supplied with several functionality to support af-checks using the stereo decoder. the additional pin (afs) is implemented in order to speed up the stereo decoder af-functions compared to iic controlling. the block diagramm of afs function is shown in figure 17 . in order to separate the different functions of the afs pin, two different logic thresholds are implemented. below the higher threshold voltage (2.4v) only the multipath-detector is switched into small time constant (internal logical signal mpfast). below the lower threshold voltage (0.8v) the full afs function is activated. the mpxin pin is switched into high impedance mode (internal signal afsmute), which avoids any clicks during the jump condition. if the stereo decoder is not muted, it is possible at the same time to evaluate the noise- and multipath-content of the alternate frequency using the quality detector output. furthermore the afs pin does also freeze the condition of pilot locking and magnitude (internal signal pdhold). the pdhold signal is defined by v th1 or v th2 , dependent on the pdh signal.
functional description TDA7540B 32/75 4.4 pll and if counter section 4.4.1 pll frequency synthesizer block this part contains a frequency synthesizer and a loop filter for the radio tuning system. only one vco is required to build a complete pll system for fm world tuning and am upconversion (see figure 9 ). for auto search stop operation an if counter system is available. the pll counter works in a two stages configuration. the first stage is a swallow counter with a two modulus (32/33) precounter. the second stage is an 11-bit programmable counter. the circuit receives the scaling factors for the programmable counters and the values of the reference frequencies via an i 2 c-bus interface.the reference frequency is generated by an adjustable internal (xtal) oscillator followed by the reference divide r. the main reference and step-frequencies are free selectable (rc, pc). output signals of the phase detector are switching the programmable current sources. the loop filter integrates their currents to a dc voltage. the values of the current sources are programmable by 6 bits also received via the i 2 c bus (a, b, currh, lpf). to minimize the noise induced by the di gital part of the system, a special guard configuration is implemented. the loop gain can be set for different conditions by setting the current values of the chargepump generator. frequency generation for phase comparison the rf signals applies a two modulus counter (32/33) pre-scaler, which is controlled by a 5- bit a-divider. the 5-bit register (pc0 to pc4) controls this divider. in parallel the output of the prescaler connects to an 11-bit b-divider. the 11- bit pc register (pc5 to pc15) controls this divider dividing range behind vco divider: f vcodiv = [33 x a + (b + 1 - a) x 32] x f ref f vcodiv = (32 x b + a + 32) x f ref important: for correct operation: a 32; b a three state phase comparator the phase comparator generates a phase error signal according to phase difference between f syn and f ref . this phase error signal drives the charge pump current generator. charge pump current generator this system generators signed pulses of current. the phase error signal decides the duration and polarity of those pulses. the current absolute values are programmable by a register for high current and b register for low current.
TDA7540B functional description 33/75 inlock detector switching the chargepump in low current mode can be done either via software or automatically by the inlock detector, by setting bit ldena to "1". after reaching a phase difference about lower than 40nsec the chargepump is forced in low current mode. a new pll divider alternation by i 2 c-bus will switch the chargepump in the high current mode. low noise cmos op-amp an internal voltage divider at pin vref2 connects the positive input of the low noise op- amp. the charge pump output connects the negative input. this internal amplifier in cooperation with external components can provide an active filter. the negative input is switchable to three input pins, to increase the flexibility in application. this feature allows two separate active filters for different applications. while the high current mode is activated lphc output is switched on. 4.4.2 if counter block the aim of if counter is to measure the intermediate frequency of the tuner for am and fm mode. the input signal for fm and am upconversion is the same 10.7mhz if level after limiter. am 450khz signal is coming from narrow filtered if2 before demodulation. a switch controlled by if counter mode (ifcm) is choosing the input signal for if counter. the grade of integration is adjustable by eight different measuring cycle times. the tolerance of the accepted count value is adjustable, to reach an optimum compromise for search speed and precision of the evaluation. the if-counter mode the if counter works in 3 modes controlled by ifcm register. sampling timer a sampling timer generates the gate signal for the main counter. the basically sampling time are in fm mode 6.25khz (t tim =160 s) and in am mode 1khz (t tim =1ms). this is followed by an asynchronous divider to generate several sampling times. intermediate frequency main counter this counter is a 11 - 21-bit synchronous auto reload down counter. five bits (cf) are programmable to have the possibility for an adju st to the centre fre quency of the if-filter. the counter length is automatic adjusted to the chosen sampling time and the counter mode (fm, am-upc, am). at the start the counter will be loaded with a defined value which is an equivalent to the divider value (t sample xf if ). if a correct frequency is applied to the if counter frequency input at the end of the sampling time the main counter is changing its state from 0h to 1fffffh.
functional description TDA7540B 34/75 this is detected by a control logic and an external search stop output is changing from low to high. the frequency range inside which a successful count result is adjustable by the ew bits. t cnt = (cf + 1696+1) / f if fm mode t cnt = (cf + 10688+1) / f if am up conversion mode t cnt = (cf + 488+1) / f if am mode counter result succeeded: t tim t cnt - t err t tim t cnt + t err counter result failed: t tim > t cnt + t err t tim < t cnt - t err t tim = if timer cycle time (sampling time) t cnt = if counter cycle time t err = discrimination window (controlled by the ew registers) the if counter is only started by inlock information from the pll part. it is enabled by software (ifena). adjustment of the measurement sequence time the precision of the measurements is adjustable by controlling the discrimination window. this is adjustable by programming the control registers ew. the measurement time per cycle is adjustable by setting the registers ifs. adjust of the frequency value the center frequency of the discrimination window is adjustable by the control registers cf. 4.5 i 2 c-bus interface the tda7540 supports the i 2 c-bus protocol. this protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. the device that controls the transfer is a master and device being controlled is t he slave. the master will always initiate data transfer and provide the clock to transmit or receive operations. 4.5.1 data transition data transition on the sda line must only occur when the clock scl is low. sda transitions while scl is high will be interpreted as start or stop condition. 4.5.2 start condition a start condition is defined by a high to low transition of the sda line while scl is at a stable high level. this "start" condition must precede any command and initiate a data transfer onto the bus. the device continuously monitors the sda and scl lines for a valid start and will not response to any comm and if this condition has not been met.
TDA7540B functional description 35/75 4.5.3 stop condition a stop condition is defined by a low to high transition of the sda while the scl line is at a stable high level. this condition terminat es the communication between the devices and forces the bus-interface of the de vice into the in itial condition. 4.5.4 acknowledge indicates a successful data transfer. the transmitter will release the bus after sending 8 bits of data. during the 9th clock cyc le the receiver will pull the sda line to low level to indicate it receive the eight bits of data. 4.5.5 data transfer during data transfer the device samples the sda line on the leading edge of the scl clock. therefore, for proper device operation the sda line must be stable during the scl low to high transition. 4.5.6 device addressing to start the communication between two devices, the bus master must initiate a start instruction sequence, followed by an eight bit word corresponding to the address of the device it is addressing. the most significant 6 bits of the slave address are the device type identifier. the tda7540 device type is fixed as "110001". the next significant bit is used to address a particular device of the previous defined type connected to the bus. the state of the hardwired pin 59 defines the state of this address bit. so up to two devices could be connected on the same bus. when pin 59 is connected to vcc2 and a resistor at pin 55 versus ground of about 5,6k ohm the address bit ?1? is selected. in this case the am part doesn?t work. otherwise the address bit ?0? is selected (fm and am is working). therefor a double fm tuner concept is possible. the last bit of the start instruction defines the type of operation to be performed: ? when set to "1", a read operation is selected ? when set to "0", a write operation is selected the tda7540 connected to the bus will compare their own hardwired address with the slave address being transmitted, after detecting a start condition. after this comparison, the tda7540 will generate an "acknowledge" on the sd a line and will do either a read or a write operation according to the state of r/w bit. 4.5.7 write operation following a start condition the master sends a slave address word with the r/w bit set to "0". the device will generate an "acknowledge" a fter this first transmission and will wait for a second word (the word address field). this 8-bit address field provides an access to any of the 64 internal addresses. upon receipt of the word address the td a7540 slave device will respond with an "acknowledge". at this time, all the followin g words transmitted to the tda7540 will be considered as data. the internal address will be automatically increment ed up to hex40 in
functional description TDA7540B 36/75 page mode. than again subaddresse hex60 has to be transmitted for following registers above 32. after each word receipt the tda7540 will answer with an "acknowledge". 4.5.8 read operation if the master sends a slave address word with th e r/w bit set to "1", the tda7540 will transit one 8-bit data word. this data word includes the following informations: bit0 (iss filter, 1 = on, 0 = off) bit1 (iss filter bandwidth, 1 = 80khz, 0 = 120khz) bit2 (stereo,1 = stereo, 0 = mono) bit3 (1 = pll is locked in , 0 = pll is locked out). bit4 (fieldstrength indicator, 1 = lower as softmute threshold, 0 = higher as softmute threshold) bit5 (adjacent channel indicator, 1 = adjacent channel present, 0 = no adjacent channel) bit6 (deviation indicator, 1 = strong overdeviation present, 0 = no strong overdeviation) bit7 (deviation indicator, 1 = overdeviation present, 0 = no overdeviation)
TDA7540B software specification 37/75 5 software specification the interface protocol comprises: ? start condition (s) ? chip address byte ? subaddress byte ? sequence of data (n bytes + acknowledge) ? stop condition (p) the pagermode is only working up to byte 31. after byte 31 it is need to send again the chip address followed by the subaddress 32 and the databytes starting from 32 up to 39! 5.1 address organization table 9. address organization functionaddr76543210 chargepump 0 fmseek currh b1 b0 a3 a2 a1 a0 pll counter 1 pc7 pc6 pc5 pc4 pc3 pc2 pc1 pc0 2 pc15 pc14 pc13 pc12 pc11 pc10 pc9 pc8 tv1 3 tv1o7 tv1o6 tv1o5 tv1 o4 tv1o3 tv1o2 tv1o1 tv1o0 tv2 4 tv2o7 tv2o6 tv2o5 tv2 o4 tv2o3 tv2o2 tv2o1 tv2o0 ifc ctrl 1 5 ldena casf ifcm1 ifcm0 ifena ifs2 ifs1 ifs0 ifc ctrl 2 6 ew2 ew1 ew0 cf4 cf3 cf2 cf1 cf0 am ctl 7 lm tvmode tv2wb tv1wb amd1 amd0 amst amseek qualityiss 8 tiss2 tiss1 ti ss0 --- iss30 iss80 isson ctloff quality ac 9 acnth1 acnth0 acwth2 acwth1 acwth0 acg acf --- quality mp 10 mpac appm2 appm1 mpth1 mpth0 mpg mpf mpoff qualitydev 11 bwctl dth1 dth0 dwth1 dwth0 tdev2 tdev1 tdev0
software specification TDA7540B 38/75 mute1 12 mena smd3 smd2 smd1 smd0 smth2 smth1 smth0 mute2 13 f100k acm3 acm2 acm1 acm0 acmd1 acmd0 smcth vco/pllref 14 lpf amon rc2 rc1 rc0 vcod2 vcod1 vcod0 fmagc 15 rfkagc kagc2 kagc1 kagc0 ifagc1 ifagc0 rfagc1 rfagc0 amagc 16 dagc3 dagc2 dagc1 dagc0 wagc3 wagc2 wagc1 wagc0 dem adj 17 dnb1 dnb0 dem5 dem4 dem3 dem2 dem1 dem0 level 18 odsw odcur smsl sl4 sl3 sl2 sl1 sl0 if1/xtal 19 xtal4 xtal3 xtal2 xtal1 xtal0 ifg11 ifg10 xtlim tank adj 20 if1t3 if1t2 if1t1 if1t0 if2t3 if2t2 if2t1 if2t0 i/q adj 21 smo1 smo0 --- --- ph3 ph2 ph1 ph0 amifnb 22 aint1 aint0 ainbd1 ainb d0 ainbt3 ainbt2 ainbt1 ainbt0 sctrl 23 ssth3 ssth2 ssth1 ssth0 s2mode s2 s1mode s1 std1 24 stvco1 stvco0 nbt1 nbt0 si tfckl nbft tsma std2 25 sting1 sting0 deemp pth nbpc ms stdon stdm std3 26 nbdth1 nbdth0 nbon nbct h1 nbcth0 nblth2 nblth1 nblth0 std4 27 nbsmp vhcl1 vhcl0 vhch1 vhch0 maxhc1 maxhc0 hcon std5 28 mppc qdc1 qdc0 nbfs1 nbfs0 sbc2 sbc1 sbc0 std6 29 mprg1 mprg0 mpcc mpion mpbpg1 mpbpg0 nbrr1 nbrr0 std7 30 amaf lg2 lg1 lg0 roc3 roc2 roc1 roc0 std8 31 amnbd amnbfo amnbhp pdh afsm afson qng1 qng0 std9 32 amcf4 amcf3 amcf2 amcf1 amcf0 desft --- --- testtu1 33 out20 issin tout tin1 clksep test3 test2 test1 testtu2 34 out7 out6 out5 out4 out3 out2 out1 out0 testtu3 35 --- tinacm tinmp tinac out11 out10 out9 out8 testtu4 36 out19 out18 out17 out16 out15 out14 out13 out12 testtu5 37 tin2 out27 out26 out25 out24 out23 out22 out21 teststd 38 --- --- muxst3 muxst2 muxst1 muxst0 --- tst fmdemsb 39 vcom pcm --- sbsh sba sbto sbw sbt table 9. address organization (continued) functionaddr76543210
TDA7540B software specification 39/75 5.2 control register function table 10. control register function register name function a charge pump high current acf adjacent channel filter select acg adjacent channel filter gain acm threshold for startpoint adjacent channel mute acmd adjacent channel mute depth acnth adjacent channel narrow band threshold acwth adjacent channel wide band threshold afsm afs influence on stereodecoder mute afson afs pin enable ainbd am if noise blanker desensitivity ainbt am if noise blanker threshold aint am if noise blanking time amaf am audio filter amd am prescaler amcf am corner frequency amin am if1 input select amnbd am audio delay for noise blanking amnbfo am audio noise blanker high pass filter order amnbhp am audio noise blanker high pass filter frequency amon am-fm switch amseek set short time constant of agc in am seek mode amst am stereo select appm application mode quality detection b charge pump low current bwctl iss filter fixed bandwith (iss80) in automatic control casf check alternative station frequency cf center frequency if counter clksep clock separation (only for testing) ctloff switch off automatic control of iss filter currh set current high charge pump dagc am narrow band agc threshold deemp stereodecoder deemphasis dem demodulator offset
software specification TDA7540B 40/75 desft stereodecoder deemphasis shift dnb demodulator spike blanking threshold dth deviation detector threshold for iss filter ?off? dwth deviation detector threshold for iss filter narrow/wide ew frequency error window if counter f100k corner frequency of ac-mute high pass filter fmseek iss time constant change in fm seek mode hcon high cut enable if1t fm/am mixer1 tank adjust if2t am mixer2 tank adjust ifagc fm if agc ifcm if counter mode ifena if counter enable ifg if1 amplifier gain (10.7mhz) ifs if counter sampling time issin test input for iss filter isson iss filter ?on? iss30 iss filter 30khz weather band iss80 iss filter narrow/mid switch kagc fm keying agc ldena lock detector enable lg level gain adjust in stereodecoder lm local mode fm seek stop lpf loop filter input select maxhc maximum high cut mena softmute enable mpac adjacent channel control by multipath mpcc multipath detector charge current mpbpg multipath detector bandpass filter gain mpf multipath filter frequency mpg multipath filter gain mpion multipath internal influence enable mpoff multipath control ?off? mppc multipath influence on peak discharge current mprg multipath detector rectifier gain table 10. control register function (continued) register name function
TDA7540B software specification 41/75 mpth multipath threshold ms mono/stereo switch automatically muxst test multiplexer output stereodecoder nbcth noise blanker noise controlled threshold nbdth noise blanker deviation controlled threshold nbfs field strength controlled noise blanker nbft am noise blanker fixed threshold nblth noise blanker low threshold nbon noise blanker enable nbpc noise blanker peak charge current nbrr noise blanker rectifier discharge resistor nbsmp strong multipath influence on noise blanker on/off nbt noise blanker time odcur current for overdeviation-correction odsw overdeviation-correction enable out test output (only for testing) pc counter for pll (vco frequency) pcm pilot cancellation mode pdh pd hold activation ph i/q mixer phase adjust pth pilot threshold qdc quality detect or coefficient qng quality noise gain rc reference counter pll rfagc fm rf agc rfkagc fm rf keying agc roc roll-off compensation s two mode switching output enable sba fm demodulator spike blanker attack mode sbc stereoblend control sbsh fm demodulator spike blanker sample&hold mode sbt fm demodulator spike blanker test mode sbto fm demodulator spike blanker toggle mode sbw fm demodulator spike blanker window mode si signal invertion table 10. control register function (continued) register name function
software specification TDA7540B 42/75 sl s meter slider smode two mode switching output smcth softmute capacitor threshold for iss ?on? smd softmute depth threshold smo softmute reference voltage offset smsl s meter slope smth softmute startpoint threshold ssth unweighted fieldstrenght threshold for seek stop stdon stereodecoder on/off if muted stdm stereodecoder mute enable sting stereodecoder ingain stvco stereodecoder vco adjust tdev time constant for deviation detector test testing pll/ifc (only for testing) tfckl fast clock for testing audioprocessor tin switch fsu pin to test input (only for testing) tinac test input adjacent channel (only for testing) tinacm test input adjacent channel mute (only for testing) tinmp test input multipath(only for testing) tiss time constant for iss filter ?on?/?off? tmsa test mode stereodecoder and audioprocessor tout switch fsu pin to test output (only for testing) tst test stereodecoder enable tvmode tuning voltage offset mode tvo tuning voltage offset for prestage tvwb tuning voltage offset for prestage (weather band mode) vcod vco divider vcom stereodecoder vco mode vhch start level high cut vhcl stop level high cut wagc am wide band agc xtal xtal frequency adjust xtlim xtal amplitude limitation table 10. control register function (continued) register name function
TDA7540B software specification 43/75 5.2.1 data byte specification table 11. subaddress msb lsb function i a5a4a3a2a1a0 000000charge pump control ------- 100000std9 ------- 100111fmdemsb 0 page mode ?off? 1 page mode enable table 12. addr 0 charge pump control msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000high current = 0ma 0001high current = 0.5ma 0010high current = 1ma 0011high current = 1.5ma ----- 1111high current = 7.5ma 0 0 low current = 0 a 0 1 low current = 50 a 1 0 low current = 100 a 1 1 low current = 150 a 0 select low current 1 select high current 0 iss time constant at pin 27 available, fmseek ?off? 1 iss time constant at pin 28 available, fmseek ?on? table 13. addr 1 pll counter 1 (lsb) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 00000000lsb = 0 00000001lsb = 1 00000010lsb = 2
software specification TDA7540B 44/75 swallow mode: f vco /f syn = lsb + msb + 32 --------- 11111100lsb = 252 11111101lsb = 253 11111110lsb = 254 11111111lsb = 255 table 13. addr 1 pll counter 1 (lsb) (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 14. addr 2 pll counter 2 (msb) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 00000000msb = 0 00000001msb = 256 00000010msb = 512 --------- 11111100msb = 64768 11111101msb = 65024 11111110msb = 65280 11111111msb = 65536 table 15. addr 3,4 tv1,2 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000000tuning voltage offset = 0 0000001tvo = 25mv 0000010tvo = 50mv --------- 1111111tvo = 3175mv 0-tvo 1+tvo
TDA7540B software specification 45/75 table 16. addr 5 if counter control 1 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 000t sample = 20.48ms (fm)128ms (am ) 001t sample = 10.24ms (fm)64ms (am ) 010t sample = 5.12ms (fm)32ms (am ) 011t sample = 2.56ms (fm)16ms (am ) 100t sample = 1.28ms (fm)8ms (am ) 101t sample = 640 s (fm)4ms (am ) 110t sample = 320 s (fm)2ms (am) 111t sample = 160 s (fm)1ms (am ) 0 if counter disable / stand by 1 if counter enable 00 not valid 0 1 if counter fm mode 1 0 if counter am mode (450khz) 1 1 if counter am mode (10.7mhz) 0 disable mute & agc on hold in fm mode 1 enable mute & agc on hold in fm mode 0 lock detector disable 1 lock detector enable table 17. addr 6 if counter control 2 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 00000f center = 10.60625mhz (fm) / 10.689mhz ; 449khz (am) 00001f center = 10.61250mhz (fm) / 10.690mhz ; 450khz (am) --------- 01011f center = 10.67500mhz (fm) / 10.700mhz ; 460khz (am) 01100f center = 10.68125mhz (fm) / 10.701mhz ; 461khz (am) 01101f center = 10.68750mhz (fm) / 10.702mhz ; 462khz (am) 01110f center = 10.69375mhz (fm) / 10.703mhz ; 463khz (am) 01111f center = 10.70000mhz (fm) / 10.704mhz ; 464khz(am) --------- 11111f center = 10.80000mhz (fm) / 10.720mhz ;480khz (am) 000 not valid 001 not valid
software specification TDA7540B 46/75 010 not valid 011 ? f = 6.25khz (fm)1khz (am) 100 ? f = 12.5khz (fm) 2khz (am) 101 ? f = 25khz (fm) 4khz (am) 110 ? f = 50khz (fm) 8khz (am) 111 ? f = 100khz (fm)16khz (am) table 17. addr 6 if counter control 2 (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 18. addr 7 am control msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 normal agc time constant 1 short time constant for am seek stop 0 multipath information available fm at pin 24 1 am stereo output available at pin 24 0 0 prescaler ratio 10 0 1 prescaler ratio 8 1 0 prescaler ratio 6 1 1 prescaler ratio 4 0 0 disable additional tv1, 2 offset 0 1 enable additional tv1 offset +3,175v (for weather band) 1 0 enable additional tv2 offset +3,175v (for weather band) 1 1 enable additional tv1, 2 offset +3,175v (for weather band) 0 tv is tracking with pll 1 tv is independing on pll 0 disable local mode 1 enable local mode (pin diode current = 0.5ma) table 19. addr 8 quality iss filter msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 iss filter control ?on? 1 iss filter control ?off? 0 switch iss filter ?off? 1 switch iss filter ?on?
TDA7540B software specification 47/75 0 switch ?off? iss filter 120khz 1 switch ?on? iss filter 80khz 0 switch ?off? iss filter 30khz for weatherband 1 switch ?on? iss filter 30khz for weatherband 000 discharge current1 a, charge current mid 74 a narrow124 a 001 discharge current3 a, charge current mid 72 a narrow122 a 010 discharge current5 a, charge current mid 70 a narrow120 a 0 1 1 discharge current7 a, charge current mid 68 ? narrow118 a --- - 111 discharge current15 a,charge current mid 60 anarrow110 a table 20. addr 9 quality detection adjacent channel msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0/1 not valid 0 ac highpass frequency 100khz 1 ac bandpass frequency 100khz 0 ac gain 32db 1 ac gain 38db 0 0 0 ac wide band threshold 0.25v 0 0 1 ac wide band threshold 0.35v 0 1 0 ac wide band threshold 0.45v --- - 1 1 1 ac wide band threshold 0.95v 0 0 ac narrow band threshold 0.0v 0 1 ac narrow band threshold 0.1v 1 0 ac narrow band threshold 0.2v 1 1 ac narrow band threshold 0.3v table 19. addr 8 quality iss filter (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0
software specification TDA7540B 48/75 table 21. addr 10 quality detection multipath msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 multipath control ?on? 1 multipath control ?off? 0 mp bandpass frequency 19khz 1 mp bandpass frequency 31khz 0 mp gain 12db 1 mp gain 23db 0 0 mp threshold 0.50v 0 1 mp threshold 0.75v 1 0 mp threshold 1.00v 1 1 mp threshold 1.25v 0 0 application mode 1 0 1 application mode 2 0 multipath eliminates ac 1 multipath eliminates ac and ac+ table 22. addr 11 quality deviation detection msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 charge current 39 a , discharge current 1 a 0 0 1 charge current 37 a , discharge current 3 a 0 1 0 charge current 35 a , discharge current 5 a 0 1 1 charge current 33 a , discharge current 7 a ---- 1 1 1 charge current 25 a , discharge current 15 a 0 0 dev threshold for iss narrow/wide 30khz 0 1 dev threshold for iss narrow/wide 45khz 1 0 dev threshold for iss narrow/wide 60khz 1 1 dev threshold for iss narrow/wide 75khz 0 0 dev threshold for iss filter ?off? ratio 1.5 0 1 dev threshold for iss filter ?off? ratio 1.4 1 0 dev threshold for iss filter ?off? ratio 1.3 1 1 dev threshold for iss filter ?off? ratio 1
TDA7540B software specification 49/75 0 disable iss filter to fixed bandwith (iss80) in automatic control 1 enable iss filter to fixed bandwith (iss80) in automatic control table 23. addr 12 softmute control 1 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 startpoint mute 0 in application about 3db v antenna level 0 0 1 startpoint mute 1 in application about 4db v antenna level ---- 1 1 1 startpoint mute 7 in application about 10db v antenna level 0 0 0 0 mute depth 0 in application 18db 0 0 0 1 mute depth 1 in application 20db 0 0 1 0 mute depth 2 in application 22db 0 0 1 1 mute depth 3 in application 24db ---- - (logarithmically behaviour) 1 1 1 1 mute depth 15 in application 36db 0 fm mute disable, (has to be 0 in am mode) 1 fm mute enable table 24. addr 13 softmute control 2 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 disable mute threshold for iss filter ?on? 1 enable mute threshold for iss filter ?on? 0 0 ac mute depth 10db 0 1 ac mute depth 8db 1 0 ac mute depth 6db 1 1 ac mute depth 4db 0 0 0 0 ac mute threshold 60mv 0 0 0 1 ac mute threshold 80mv 0 0 1 0 ac mute threshold 100mv ---- - 0 1 1 1 ac mute threshold 340mv table 22. addr 11 quality deviation detection (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0
software specification TDA7540B 50/75 1 1 1 1 ac mute ?off? 0 ac mute filter 110khz 1 ac mute filter 100khz table 25. addr 14 vcodiv/pllref msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 not valid (only for testing) 0 1 vco frequency divided by 2 1 0 vco frequency divided by 3 1 1 original vco frequency 0 vco? i? signal 0 degree 1 vco ?i? signal 180 degree 1 0 0 pll reference frequency 50khz 1 0 1 pll reference frequency 25khz 1 1 0 pll reference frequency 10khz 1 1 1 pll reference frequency 9khz 0 0 0 pll reference frequency 2khz 0 select fm mode 1 select am mode 0 select pll low pass filter fm 1 select pll low pass filter am table 24. addr 13 softmute control 2 (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 26. addr 15 fm agc msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 rfagc threshold v 9-11th = 85(77 ant)db v 0 1 rfagc threshold v 9-11th = 90(82 ant)db v 1 0 rfagc threshold v 9-11th = 94(86 ant)db v 1 1 rfagc threshold v 9-11th = 96(88 ant)db v 0 0 ifagc threshold v 77th = 86(60 ant)db v 0 1 ifagc threshold v 77th = 92(66 ant)db v 1 0 ifagc threshold v 77th = 96(70 ant)db v 1 1 ifagc threshold v 77th = 98(72 ant)db v
TDA7540B software specification 51/75 0 0 0 kagc threshold 80db v 0 0 1 kagc threshold 82db v 0 1 0 kagc threshold 84db v 0 1 1 kagc threshold 86db v 1 0 0 kagc threshold 88db v 1 0 1 kagc threshold 90db v 1 1 0 kagc threshold 92db v 1 1 1 keying agc ?off? 0rf kagc?0ff? 1rf kagc?0n? table 26. addr 15 fm agc (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 27. addr 16 am agc msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000wagc v 4th = 90(65 ant)db v 71th = 90(60 ant)db 0001wagc v 4th = 94(69 ant)db v 71th = 94(64 ant)db 0010wagc v 4th = 97(72 ant)db v 71th = 96,5(66,5 ant)db 0011 wagc v 4th = 98,5(73,5 ant)db v 71th = 98,5(68,5 ant)db 0100wagc v 4th = 100(75 ant)db v 71th = 100(70 ant)db 0101wagc v 4th = 101,5(76,5 ant)db v 71th = 101(71 ant)db 0110 wagc v 4th = 102,5(77,5 ant)db v 71th = 102,5(72,5 ant)db 0111 wagc v 4th = 103,5(78,5 ant)db v 71th = 103,5(73,5 ant)db 1000wagc v 4th = 104,5(79,5 ant)db v 71th = 104(74 ant)db 1001wagc v 4th = 105(80 ant)db v 71th = 105(75 ant)db 1010wagc v 4th = 106(81 ant)db v 71th = 105,5(75,5 ant)db 1011 wagc v 4th = 106,5(81,5 ant)db v 71th = 106,5(76,5 ant)db 1100wagc v 4th = 107(82 ant)db v 71th = 107(77 ant)db 1101wagc v 4th = 108(83 ant)db v 71th = 107,5(77,5 ant)db 1110wagc v 4th = 108,5(83,5 ant)db v 71th = 108(78 ant)db 1111wagc v 4th = 109(84 ant)db v 71th = 108,5(78,5 ant)db 0000 dagc v 71th = 74(44 antenna)db
software specification TDA7540B 52/75 0001 dagc v 71th = 77(47 antenna)db 0010 dagc v 71th = 79(49 antenna)db 0011 dagc v 71th = 80,5(50,5 antenna)db 0100 dagc v 71th = 82(52 antenna)db 0101 dagc v 71th = 83,5(53,5 antenna)db 0110 dagc v 71th = 85(55 antenna)db 0111 dagc v 71th = 86,5(56,5 antenna)db 1000 dagc v 71th = 88(58 antenna)db 1001 dagc v 71th = 89(59 antenna)db 1010 dagc v 71th = 90(60 antenna)db 1011 dagc v 71th = 91(61 antenna)db 1100 dagc v 71th = 92(62 antenna)db 1101 dagc v 71th = 93(63 antenna)db 1110 dagc v 71th = 94(64 antenna)db 1111 dagc v 71th = 96(66 antenna)db table 27. addr 16 am agc (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 28. addr 17 fm demodulator fine adjust msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000000mv 000001+8.5mv 000010+17mv ------- 011111+263.5mv 1000000mv 100001-8.5mv 100010-17mv ------- 111111-263.5mv 0 0 spike cancelation ?off? 0 1 threshold for spike cancelation 750mv 1 0 threshold for spike cancelation 270mv 1 1 threshold for spike cancelation 520mv
TDA7540B software specification 53/75 table 29. addr 18 s-meter slider msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000s meter slider offset sl=0db 0001s meter offset sl=1db 0010s meter offset sl=2db ----- 1111s meter offset sl=15db 0 s meter offset -sl 1 s meter offset +sl 0 s meter slope 1v/decade 1 s meter slope 1.5v/decade 0 overdeviation correct ion current max=45 a 1 overdeviation correct ion current max=90 a 0 overdeviation correction ?off? 1 overdeviation correction ?on? table 30. addr 19 if gain/xtal adjust msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 xtal amplitude limitation disable 1 xtal amplitude limitation enable 0 0 if1 gain1 9db 0 1 if1 gain1 12db 1 0 if1 gain1 15db 1 1 if1 gain1 18db 00000 c load 0pf 00001 c load 0.75pf 00010 c load 1.5pf 00011 c load 2.25pf 00100 c load 3pf ----- - 11111 c load 23.25pf
software specification TDA7540B 54/75 table 31. addr 20 tank adjust msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 450khz 0pf 0 0 0 1 450khz 1.6pf 0 0 1 0 450khz 3.2pf 0 0 1 1 450khz 4.8pf ----- 1 1 1 1 450khz 24pf 0 0 0 0 10.7mhz 0pf 0 0 0 1 10.7mhz 0.55pf 0 0 1 0 10.7mhz 1.1pf 0 0 1 1 10.7mhz 1.65pf ---- - 1 1 1 1 10.7mhz 8.25pf table 32. addr 21 i/q fm mixer1 adjust msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000-7 degree 0001-6 degree 0010-5 degree ----- 01110 degree 1000+1 degree 1001+2 degree ----- 1111+8degree 0 0 softmute reference offset off 0 1 softmute reference offset -50mv 1 0 softmute reference offset -100mv 1 1 softmute reference offset -150mv
TDA7540B software specification 55/75 table 33. addr 22 am if noise blanker msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000ainbt 0mv 0001ainbt 12.5mv 0010ainbt 25mv ----- 1111ainbt 187.5mv 0 0 ainbd ?on? 0 1 ainbd 4.0v 1 0 ainbd 3.2v 1 1 ainbd ?off? 00 aint 8 s 01 aint 11 s 10 aint 14 s 11 aint 17 s table 34. addr 23 switch control msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 s1 low output voltage 1 s1 high output voltage 0 s1 emitter output available 1 s1 open collector output available 0 s2 low output voltage 1 s2 high output voltage 0 s2 emitter output available 1 s2 open collector output available 0 0 0 0 sstop=ifc (if counter status) 0 0 0 1 sstop= h if ifc=h&fsu>0.89v 0 0 1 0 sstop= h if ifc=h&fsu>1.16v 0 0 1 1 sstop= h if ifc=h&fsu>1.43v ---- 1 1 1 1 sstop= h if ifc=h&fsu>4.67v
software specification TDA7540B 56/75 table 35. addr 24 stereodecoder 1 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 test mode stereodecoder and audioprocessor ?on? 1 test mode stereodecoder and audioprocessor ?off? 0 audio am noise blanker fix threshold disable 1 audio am noise blanker fix threshold enable 0 fast clock for testing audioprocessor ?on? 1 fast clock for testing audioprocessor ?off? 0 audio inverter off 1 audio inverter on 0 0 audio noise blanking time (fm = 38 s, am = 1.2 ms) 0 1 audio noise blanking time (fm = 25,5 s, am = 0.8 ms) 1 0 audio noise blanking time (fm = 32 s, am = 1.0 ms) 1 1 audio noise blanking time (fm = 22 s, am = 0.64 ms) 0 stereodecoder vco adjust minus 1 stereodecoder no vco adjust 0 stereodecoder vco adjust plus 1 stereodecoder no vco adjust table 36. addr 25 stereodecoder 2 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 stereo decoder mute disable 1 stereo decoder mute enable 0 stereo decoder ?on? if muted 1 stereo decoder ?off? if muted 0 forced mono, must be set in am 1 mono/stereo switch automatically 0 noise blanker peak charge current low 1 noise blanker peak charge current high 0 pilot threshold high 1 pilot threshold low 0 deemphasis 50 s 1 deemphasis 75 s 0 0 stereodecoder ingain = 3,75db 0 1 stereodecoder ingain = 2,5db
TDA7540B software specification 57/75 1 0 stereodecoder ingain = 1,25db 1 1 stereodecoder ingain = 0db table 36. addr 25 stereodecoder 2 (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 37. addr 26 stereodecoder 3 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 audio noise blanker low threshold 280mv 0 0 1 audio noise blanker low threshold 261mv 0 1 0 audio noise blanker low threshold 242mv 0 1 1 audio noise blanker low threshold 223mv 1 0 0 audio noise blanker low threshold 204mv 1 0 1 audio noise blanker low threshold 185mv 1 1 0 audio noise blanker low threshold 166mv 1 1 1 audio noise blanker low threshold 147mv 0 0 audio noise blanker noise controlled threshold 1200mv 0 1 audio noise blanker noise controlled threshold 950mv 1 0 audio noise blanker noise controlled threshold 700mv 1 1 audio noise blanker noise controlled threshold 450mv 0 audio noise blanker off 1 audio noise blanker on 0 0 deviation adjust 2,0v 0 1 deviation adjust 1,5v 1 0 deviation adjust 1,0v 1 1 deviation detector off table 38. addr 27 stereodecoder 4 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 high cut off 1 high cut on 0 0 max. high cut 10db 0 1 max. high cut 5.5db 1 0 max. high cut 7.5db 1 1 max. high cut 8.5db
software specification TDA7540B 58/75 0 0 start level high cut at 42% ref5v 0 1 start level high cut at 50% ref5v 1 0 start level high cut at 58% ref5v 1 1 start level high cut at 66% ref5v 0 0 stop level high cut at 11% vhch 0 1 stop level high cut at 18.3% vhch 1 0 stop level high cut at 25.7% vhch 1 1 stop level high cut at 33% vhch 0 strong multipath influence on peak discharge off 1 strong multipath influence on peak discharge on table 38. addr 27 stereodecoder 4 (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 39. addr 28 stereodecoder 5 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 stereoblend control at 29% ref5v 0 0 1 stereoblend control at 33% ref5v 0 1 0 stereoblend control at 38% ref5v 0 1 1 stereoblend control at 42% ref5v 1 0 0 stereoblend control at 46% ref5v 1 0 1 stereoblend control at 50% ref5v 1 1 0 stereoblend control at 54% ref5v 1 1 1 stereoblend control at 58% ref5v 0 0 audio noise blanker field strength adjust 2,0v 0 1 audio noise blanker field strength adjust 1,6v 1 0 audio noise blanker field strength adjust 1,4v 1 1 audio noise blanker field strength adjust off 0 0 quality detector coefficient a=0,6 0 1 quality detector coefficient a=0,75 1 0 quality detector coefficient a=0,9 1 1 quality detector coefficient a=1,05 0 multipath influence on peak discharge off 1 multipath influence on peak discharge on (-1v/ms)
TDA7540B software specification 59/75 table 40. addr 29 stereodecoder 6 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 noise rectifier dischar ge resistor = infinite 0 1 noise rectifier discharge resistor =56k 1 0 noise rectifier discharge resistor =33k 1 1 noise rectifier discharge resistor =18k 0 0 multipath detector band pass gain =6db 0 1 multipath detector band pass gain =12db 1 0 multipath detector band pass gain =9db 1 1 multipath detector band pass gain =10,5db 0 multipath detector internal influence on 1 multipath detector internal influence off 0 multipath detector charge current =0,8 a 1 multipath detector charge current =0,4 a 0 0 multipath detector rectifier gain =7,6db 0 1 multipath detector rectifier gain =4,6db 1 0 multipath detector rectifier gain =0db 1 1 multipath detector rectifier gain disabled table 41. addr 30 stereodecoder 7 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000roll-off com pensation not allowed 0001roll-off com pensation 17.1% 0010roll-off com pensation 15.2% 0011roll-off com pensation 13.3% 0100roll-off com pensation 11.4% 0101roll-off com pensation 9.6% 0110roll-off com pensation 7.8% 0111roll-off com pensation 6.0% 1000roll-off com pensation not allowed 1001roll-off com pensation 4,7% 1010roll-off com pensation 2.9% 1011roll-off com pensation 1.3% 1100roll-off com pensation -0.2% 1101roll-off com pensation -1.8%
software specification TDA7540B 60/75 1110roll-off com pensation -3.4% 1111roll-off com pensation -5% 0 0 0 level gain 0db 0 0 1 level gain 0.67db 0 1 0 level gain 1.34db --- - 1 1 1 level gain 4.7db 0 am audio filter ?off? 1 am audio filter ?on? table 41. addr 30 stereodecoder 7 (continued) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 table 42. addr 31 stereodecoder 8 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 quality noise gain =6db 0 1 quality noise gain =9db 1 0 quality noise gain =12db 1 1 quality noise gain =15db 0 enable afs pin 1 disable afs pin 0 afs inluence on stereodecoder mute 1 no afs inluence on stereodecoder mute 0 pd hold activation if afs TDA7540B software specification 61/75 table 43. addr 32 stereodecoder 9 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 deemphasis shift (25/37.5 s) 1 deemphasis no shift (50/75 s) 0 0 0 0 0 am corner frequency = 3.18khz 0 0 0 0 1 am corner frequency = 3.10khz 0 0 0 1 0 am corner frequency = 3.02khz ----- 1 1 1 0 1 am corner frequency = 1.12khz 1 1 1 1 1 am corner frequency = 1.06khz table 44. addr 33 test tuner control 1 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxxxonly for testing ( have to be set to 0) table 45. addr 34 test tuner control 2 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxxxonly for testing ( have to be set to 0) table 46. addr 35 test tuner control 3 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxxxonly for testing ( have to be set to 0) table 47. addr 36 test tuner control 4 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxxxonly for testing ( have to be set to 0) table 48. addr 37 test tuner control 5 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxxxonly for testing ( have to be set to 0)
software specification TDA7540B 62/75 table 49. addr 38 test stereodecoder control msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxx0only for testing ( have to be set to 1) table 50. addr39 fm demodulator spike blanker and stereo decoder msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxx0spike blanker testing ?off? 1 spike blanker testing ?on? 0 spike blanker window mode: early + late 1 spike blanker window mode: early - late 0 spike blanker toggledetector disable 1 spike blanker toggledetector enable 0 spike blanker slow attack 1 spike blanker fast attack 0 spike blanker s&h mode: ignore restore 1 spike blanker s&h mode: standard 1 stereo decoder vco on (mandatory in fm mode) 0 stereo decoder vco off 0 pilot cancellation mode: always 1 pilot cancellation mode: if pilot > threshold 0 stereo decoder vco set456 1 stereo decoder vco free running
TDA7540B appendix 63/75 6 appendix figure 8. block diagram i/q mixer figure 9. block diagram vco
appendix TDA7540B 64/75 figure 10. block diagram keying agc figure 11. block diagram iss function
TDA7540B appendix 65/75 block diagram quality detection principle (without overdeviation correction) table 51. signal low high ac no adjacent channel adjacent channel present ac+ no strong adjacent channel adjacent channel higher as ac sm fieldstrength higher as softmute threshold f ieldstrength lower as softmute threshold dev deviation lower as threshold dwth deviation higher as threshold dwth dev+ deviation lower as threshold dth*dwth deviation higher as threshold dth*dwth inton iss filter off by logic (wide) iss filter on by logic int80 iss filter 120khz (mid) iss filter 80khz (narrow) table 52. input signals mode1 mode2 ac ac+ sm dev dev+ inton int80 function inton int80 function 000000 0wide0 0wide 000100 0wide0 0wide 000110 0wide0 0wide 0 0 1 0 0 1 1 narrow 1 1 narrow 001100 0wide1 0mid 001110 0wide0 0wide 100001 1narrow1 0mid 1 1 0 0 0 1 1 narrow 1 1 narrow 100101 0mid1 0mid 110111 0mid1 1narrow 1 0 1 0 0 1 1 narrow 1 1 narrow 1 1 1 0 0 1 1 narrow 1 1 narrow 101101 0mid1 0mid 111101 0mid1 1narrow 101111 0mid1 0mid 111111 0mid1 1narrow
appendix TDA7540B 66/75 figure 12. block diagram am part
TDA7540B appendix 67/75 figure 13. blockdiagram am if noise blanker figure 14. block diagram stereodecoder
appendix TDA7540B 68/75 figure 15. block diagram audio noise blanker figure 16. block diagram multipath detection
TDA7540B appendix 69/75 figure 17. block diagram afs function
part list (application and measurment circuit) TDA7540B 70/75 7 part list (application and measurment circuit) table 53. part list item description f1 toko 5kg 611sns-a096go f2 toko 5km 396ins-a467ao f3 toko mc152 e558cn-100021=p3 f4 toko 7psg p826rc-5134n f5 toko pgl 5pglc-5103n l1 toko fslm 2520-150 15h l2,l4 toko fslm 2520-680 68h l3,l8 siemens simid03 b82432 1mh l5 toko ll 2012-220 l6 toko ll 2012-270 l7 toko ll 2012-22.0 cf1,cf2 murata sfe10.7ms3a10-a 180khz or (toko cfsk107m3-ae-20x) cf3 murata sfe10.7mja10-a 150khz or (toko cfsk107m4-ae-20x) cf4 murata sfps 450h 6khz or (toko arlfc450t) d1 toshiba 1sv172 d2,d3 toko kp2311e d4 toko kv1370nt d5 philips bb156 q1 toshiba hn3g01j
TDA7540B application circuit 71/75 8 application circuit figure 18. application circuit
application notes TDA7540B 72/75 9 application notes following items are important to get highest performance of tda7540 in application: 1. in order to avoid leakage current from pll loop filter input to ground a guardring is recommended around loop filter pin?s with pll reference (vref2) voltage potential. 2. distance between xtal and vco input pin 18 should be far as possible and xtal package should get a shield versus ground. 3. blocking of vco supply should be near at pin 20 and pin 21. 4. blocking of vcc2 supply should be near at pin 64 and pin 61. 5. wire lenght to fm mixer1-input and -output should be symetrically and short. 6. fm demodulator capacitance at pin 56 should be sense connected as short as possible versus demodulator ground at pin 57. 7. wire lenght from am mixer tank output to 9khz ceramic filter input has to be short as possible. 8. to minimize ?am tweet? the am demodu lator capacitor should be connected versus gndvcc1 at pin 41 and fsu output at pin 22 should be filtered with capacitor of about 2,2nf versus gndvcc2.
TDA7540B package information 73/75 10 package information in order to meet environmental requirements, st offers these devices in ecopack? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com. figure 19. tqfp80 (14x14x1.40mm) mechanical data & package dimensions dim. mm inch min. typ. max. min. typ. max. a 1.60 0.063 a1 0.05 0.15 0.002 0.006 a2 1.35 1.40 1.45 0.053 0.055 0.057 b 0.22 0.32 0.38 0.009 0.013 0.015 c 0.09 0.20 0.003 0.008 d 16.00 0.630 d1 14.00 0.551 d3 12.35 0.295 e 0.65 0.0256 e 16.00 0.630 e1 14.00 0.551 e3 12.35 0.486 l 0.45 0.60 0.75 0.018 0.024 0.030 l1 1.00 0.0393 k3.5 (min.), 7 (max.) tqfp80 (14x14x1.40mm) a a2 a1 seating plane c 20 21 40 41 60 61 80 e3 d3 e1 e d1 d e 1 b tqfp80l 0.10mm .004 pin 1 identification k l l1 0.25mm gage plane outline and mechanical data
revision history TDA7540B 74/75 11 revision history table 54. document revision history date revision changes 10-may-2006 1 initial release.
TDA7540B 75/75 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorize representative of st, st products are not designed, authorized or warranted for use in military, air craft, space, life saving, or life sustaining applications, nor in products or systems, where failure or malfunction may result in personal injury, death, or severe property or environmental damage. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2006 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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