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fully integrated audioprocessor 5 stereo + 1 mono inputs four independent speaker outputs dynamic compression stage for cd subwoofer output softstep feature for volume voice-band filter direct mute and softmute pause detector fully programmable by i 2 c bus in- terface description the tda7462 is a high performance audioproc- essor with fully integrated audio filters. the digi- tal control allows the programming of all filter characteristics in a wide range without the need of external components. new innovative features are included , a dynamic compression stage to optimize audio response of cd sources an addi- tional output channel for subwoofer and a sepa- rate source selector for rear channel. the use of a dedicated bicmos process makes signal proc- essing very linear thus achieving low distortion and low noise figures. november 2001 ? supply volume cref out lf d96au864 i 2 c bus beep v s pdl input multiplexer + mixing-stage pause loudness soft mute bass treble voice-bandpass out rf out rr out rl sda scl mono fader digital control cd r+ pdr pdgnd se1l gnd mute cd l+ subwoofer out front selector rear selector cd l- cd r- se1r se2r se2l md+ md- sem/se3l se3r hp lp front fader front fader rear fader rear fader in-gain + auto zero compander loudness in-gain subwoofer lp pause detect. subout+ subout- 7 9 10 11 1 2 13 12 3 4 28 27 23 16 15 14 865 26 22 21 19 20 18 17 25 24 block diagram so28 ordering number: tda7462d tda7462 dual audioprocessor with compander and subwoofer output 1/25
absolute maximum ratings symbol parameter value unit v s operating supply voltage 10.5 v t amb operating ambient temperature range -40 to 85 c t stg operating storage temperature range -55 to 150 c supply symbol parameter test condition min. typ. max. unit v s supply voltage 7.5 9 10.2 v i s supply current v s = 9v 25 30 35 ma svrr ripple rejection @ 1khz audioprocessor (all filters flat) 60 db esd all pins are protected against esd according to the mil883 standard. thermal data symbol parameter value unit r th-j pins thermal resistance junction-pins max 85 c/w se1l se1r md+ md- cdl+ cdr- cdl- cdr+ pdr outlr outrf outlf scl pause sda mute se3r se3l 1 3 2 4 5 6 7 8 9 26 25 24 23 22 20 21 19 27 10 28 pdgnd outrr d98au865 pdl se2l se2r v s subout- subout+ 11 12 13 18 16 17 15 14 cref gnd pin connection tda7462 2/25
pin description n. name function type 1 se1l single ended input 1 left channel i 2 se1r single ended input 1 right channel i 3 md+ mono differenzial input + i 4 md- mono differenzial input - i 5 cdl+ cd input left channel + i 6 cdl- cd input left channel - i 7 cdr- cd input right channel - i 8 cdr+ cd input right channel + i 9 pdr pseudo differential input left i 10 pdgnd pseudo differential common ground i 11 pdl pseudo differential input right i 12 se2l single ended input 2 left channel i 13 se2r single ended input 2 right channel i 14 cref stabilizer capacitor pin s 15 gnd supply ground s 16 vs supply voltage s 17 subout- subwoofer output - o 18 subout+ subwoofer output + o 19 outrr speaker output right rear o 20 outlr speaker output left rear o 21 outrf speaker output right front o 22 outlf speaker output left front o 23 pause pause detector output o 24 scl i 2 c bus clock i 25 sda i 2 c bus data i/o 26 mute softmute drive i 27 se3r single ended input 3 right channel i 28 se3l single ended input 3 left channel i pin type legenda: i = input o = output i/o = input/output s = supply tda7462 3/25
electrical characteristics (v s = 9v; t amb = 25c; r l = 10k w ; all gains = 0db; f = 1khz; unless otherwise specified). symbol parameter test condition min. typ. max. unit input selector r in input resistance all inputs except phone 70 100 130 k w v cl clipping level 2.2 2.6 v rms s in input separation 80 100 db g in min min. input gain -1 0 1 db g in max max. input gain 13 15 17 db g step step resolution 0.5 1 1.5 db v dc dc steps adjacent gain step -5 1 5 mv g min to g max -10 6 10 mv v offset remaining offset with autozero 0.5 mv differential cd stereo input r in input resistance differential 70 100 130 k w g cd gain only at true differential input -1 -5 -11 0 -6 -12 1 -7 -13 db db db cmrr common mode rejection ratio v cm = 1v rms @ 1khz 40 70 db v cm = 1v rms @ 10khz 40 60 db e n output noise @ speaker output 20hz to 20khz flat; all stages 0db 9 m v differential md input r in input resistance differential 40 55 70 k w cmrr common mode rejection ratio v cm = 1v rms @ 1khz 40 70 db v cm = 1v rms @ 10khz 40 60 db e n output noise @ speaker output 20hz to 20khz flat; all stages 0db 9 m v differential phone input r in input resistance differential 70 100 130 k w cmrr common mode rejection ratio v cm = 1 vrms @ 1khz 35 70 db v cm = 1 vrms @ 10khz 35 60 db beep control v rms beep level 250 350 500 mv f bmin lower beep frequency 740 780 820 hz f bmax higher beep frequency 1.48 1.56 1.64 khz mixing control m level mixing level main/mix-source 0/ db -3.5/-9.6 db -6/-6 db -12/-2.5 db volume control g max max gain 30 32 34 db a max max attenuation -83 -79.5 -75 db a step step resolution 0 0.5 1 db e a attenuation set error g = -20 to 20db -0.75 0 0.75 db g = -80 to -20db -4 0 3 db e t tracking error 2db v dc dc steps adjacent attenuation steps 0.1 3 mv from 0db to g min 0.5 5 mv loudness control a step step resolution 0.5 1 1.5 db a max max. attenuation 13 15 17 db f cmin lower center frequency 360 400 440 hz f cmax higher center frequency 720 800 880 hz tda7462 4/25
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit soft mute a mute mute attenuation 80 100 db t d delay time t1 0.48 1 ms t2 0.96 2 ms t3 20 30.7 50 ms t4 70 123 170 ms v thlow low threshold for sm pin 1 1v v thhigh high threshold for sm pin 2.5 v r pd internal pull-up resistor 70 100 130 k w soft step t sw switch time t sw1 t sw2 t sw3 t sw4 t sw5 t sw6 t sw7 t sw8 0.16 0.32 0.64 1.28 2.56 5.12 10.2 20.4 ms ms ms ms ms ms ms ms bass control c range control range 14 15 16 db a step step resolution 0.5 1 1.5 db f c center frequency f c1 54 60 66 hz f c2 63 70 77 hz f c3 72 80 88 hz f c4 90 100 110 hz q bass quality factor q 1 0.9 1 1.1 q 2 1.11.251.4 q 3 1.3 1.5 1.7 q 4 1.8 2 2.2 dc gain bass-dc-gain dc = off -1 0 +1 db dc = on 4 4.4 6 db treble control c range control range 13 14 15 db a step step resolution 1 2 3 db f c center frequency f c1 8 10 12 khz f c2 10 12.5 15 khz f c3 12 15 18 khz f c4 14 17.5 21 khz speaker attenuators c range control range -53 50 -47 db a step step resolution 0.5 1 2 db a mute output mute attenuation 80 90 db e e attenuation set error -2 2 db v dc dc steps adjacent attenuation steps 0.1 5 mv 1) the sm pin is active low (mute = 0) tda7462 5/25
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit fader outputs v clip clipping level d = 0.3% 2.2 2.6 v rms r l output load resistance 2 k w c l output load capacitance 10 nf r out output impedance 30 100 w v dc dc voltage level 4.3 4.5 4.7 v pause detector v th zero crossing threshold window 1 20 mv window 2 40 mv window 3 80 mv window 4 160 mv i delay pull-up current 15 25 35 m a v thp pause threshold 3.0 v voice bandpass f hp highpass corner frequency f hp1 81 90 99 hz f hp2 162 180 198 hz f hp3 117 130 143 hz f hp4 234 260 286 hz f lp lowpass corner frequency flp1 2.7 3 3.3 khz f lp2 5.4 6 6.6 khz subwoofer attenuators c range control range -53 -50 -47 db a step step resolution 2 0.5 1 1.5 db a mute output mute attenuation 80 90 db e e attenuation set error 2 db v dc dc steps adjacent attenuation steps 1 5 mv differential outputs r l load resistance at each output 1v rms ; ac coupled; thd = 1% 1 k w 2v rms ; ac coupled; thd = 1% 2 k w r dl load resistance differential 1vrms; ac coupled; thd = 1% 2 k w 2v rms ; ac coupled; thd = 1% 4 k w c l capacitive load at each output clmin at each output to ground 470 pf c lmax capacitive load at each output c lmax at each output to ground 10 nf c dlmax capacitive load differential clmax between output terminals 5nf v offset dc offset at pins output muted -10 10 r out output impedance 30 100 w v dc dc voltage level 4.3 4.5 4.7 v e no output noise output muted 6 15 m v compander g max max. compander gain v i < -40db 19 db 23 db t att attack time t att1 6ms t att2 12 ms t att3 24 ms t att4 49 ms t rel release time t rel1 195 ms t rel2 390 ms t rel3 780 ms t rel4 1.56 s v ref compander reference input- level (equals 0db) 1khz sine-wave 0.5 v rms cf compression factor output signal/input signal 0.5 2) steps are increasing if the attenuation is higher than 24db. tda7462 6/25
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit general e no output noise bw = 20 hz to 20 khz output muted 315 m v bw = 20 hz to 20 khz all gain = 0db single ended inputs 10 20 m v s/n signal to noise ratio all gains = 0db flat; v o = 2v rms 106 db bass treble at 12db; a-weighted; v o = 2.6v rms 100 db d distortion v in = 1v rms ; all stages 0db 0.005 0.1 % v in = 1v rms ; bass & treble = 12db 0.05 0.1 % s c channel separation left/right 80 100 db e t total tracking error a v = 0 to -20db -1 0 1 db a v = -20 to -60db -2 0 2 db main features summary input multiplexer one fully differential cd stereo input with switchable attenuation one quasi-differential stereo input three single-ended stereo inputs one1 differential mono input in-gain 0..15db, 1db step internal offsetcancellation (autozero) separate source selector for rear channel beep internal beep with 2 frequencies mixing stage 4 step-mixing stage with phone or rear-selector as mix-signals loudness second order frequency response programmable center frequency and quality factor 15 x 1db attenuation steps selectable flat-mode (constant attenuation) volume 0.5db attenuion step 80db control range soft-step control with programmable times compander dynamic range compression for use with cd source 2:1 compression rate max. gain 15db bass 2nd order frequency response center frequency programmable in 4 steps dc gain programmable 15 x 1db steps treble 2nd order frequency response center frequency programmable in 4 steps 7 x 2db steps voice bandpass 2nd order butterworth highpass filter with pro- grammable cut-off frequency 2nd order butterworth lowpass filter with pro- grammable cut-off frequency speaker four independent speaker controls in 1db steps control range 50db separate mute drive subwoofer differential mono output control range 50db 2nd order lowpass filter mute functions direct mute tda7462 7/25
mute functions direct mute digitally controlled softmute with 4 program- mable mute times pause detector programmable threshold delay time defined by external capacitor functional description input stages most of the input stages are similar to the others st audioprocessors with exception of the cd in- puts (see figure 1). in fact there are some cd players in the market having a significant high source impedance which affects strongly on the common-mode rejection (chrr) of the normal differential input stage. the additional buffer of the tda7462 cd input avoids this drawback and 15k 15k 100k cd+ cd- 15k - + 15k 15k pd+ pdgnd 15k 15k - + d98au866 100k 100k 100k in gain se1 se2 se3 1 1 1 15k 100k 100k 28k 28k mdgnd md+ 28k 28k + - figure 1. input stage tda7462 8/25
offers the full common-mode rejection even with those cd players. autozero stage in order to reduce the number of pins there is no ac coupling between the in-gain and the follow- ing stage, so that any offset generated by or be- fore the stage would be transferred or even am- plified to the output. to avoid that effect, a special offset cancellation stage called autozero is imple- mented. this stage is located before the mixing block to eliminate all offsets generated by the in- put and the in-gain (notice that externally gener- ated offsets, e.g. generated through the leakage current of the coupling capacitors, are not can- celled). the auto-zeroing is started every time the data- byte 0 is selected and takes a time of max. 0.3ms. to avoid audible clicking the audioproces- sor is muted before the loudness stage during this time. autozero remain in some cases, for example if the m p is executing a refresh cycle of the i 2 c bus programming, it is not useful to start a new autozero action because no new source is selected and an undesired mute would appear at the outputs. for such applica- tions the tda7462 could be switched in the autozeroremain mode. if this bit is set to high, the databyte 0 could be loaded without invoking the autozero and the old adjustment value re- mains. full mixing stage the four-level mixing stage offers the possibility to mix the rear selector signal or the phone signal to any other source. due to the fact that the mix- ing stage is located after the in-gain stage fine adjustments of the main source level could be done in this way. figure 2. signal flow of mixing stage. tda7462 9/25
softmute the digitally controlled softmute stage allows muting/de-muting the signal with a i 2 c bus pro- grammable slope. the mute process can either be activated by the softmute pin(sm) or by the i 2 c bus. this slope is realized in a special s- shaped curve to mute slow in the critical regions (see figure 6). for timing purposes the bit 3 of the i 2 c bus out- put register is set to 1 from the start of muting un- til the end of de-muting. softstep volume when the volume level is changed audible clicks could appear at the output. the root cause of those clicks could either be a dc offset before the volume stage or the sudden change of the envelope of the audio signal. with the softstep feature both kinds of clicks could be reduced to a minimum and are no more audible. the blend time from one step to the next is programmable in four steps. -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k figure 3. loudness attenuation @ fc = 400hz (second order) -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k figure 4. loudness center frequency @ attn. = 15db (second order) 10 100 1,000 hz -20 -15 -10 -5 (db) d98au844 figure 5. loudness @ attn. = 15db, fc = 400hz 1 ext. mute +signal ref -signal 1 i 2 c bus out time d97au634 figure 6. softmute timing 2db 1db -1db -2db time d97au635 vout 10ms figure 7. soft step timing note: please notice that a started mute action is always terminated and could not be interrupted by a change of the mute signal. note: for steps more than 1db the softstep mode should be deactivated because it could generate a 1db error during the blend-time tda7462 10/25
0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k figure 11. bass normal and dc mode @ gain = 14db, fc = 80hz 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k figure 10. bass quality factors @ gain = 14db, fc = 80hz 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k figure 9. bass center @ gain = 14db, q = 1 -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k figure 8. bass control @ fc = 80hz, q = 1 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k figure 13. treble center frequencies @ gain = 14db -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k figure 12. treble control @ fc = 17.5khz filter characteristics (bass, treble, voice-band) note: the center frequency, q and dc-mode can be set independently. tda7462 11/25
db hz -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 100.0 1.0k 10.0k subwoofer application figure 14. subwoofer application with lpf 80/115hz and hpf 90/130hz db hz -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 100.0 1.0k 10.0k voiceband application figure 15. voiceband application with hpf 180/260hz and lpf 3k/6khz 80hz/115hz figure 16. switchable configuration for front/rear processing speaker attenuator due to practical aspects the steps in the speak- erattenuators are not linear over the full range. at attenuations more than 24db the steps increase from 1.5db to 10db (see data byte specification). subwoofer the subwoofer output is a differential mono out- put with 6db gain. the outgoing signal generated by adding the left and the right channel. the at- tenuator is exactely the same like the other speakers. in some applications it could be helpful to change the phase of this output by software. for this pur- pose a bit is available in the subwoofer byte to change the phase from 0 to 180. tda7462 12/25
compander stage to achieve the desired compression charac- teristic like shown below the volume has to be decreased by 4db. when the compander is working a volume word coming from this stage is added to the i 2 c bus volume word and the volume is changed with a soft slope between adjacent steps. as mentioned in the description of this stage it is not recom- mended to change the volume during this slope. the compander-hold bit (bit 7 in the subaddress- byte) is present to implement the volume change more easily. the recommended sequence for changing the volume level when compander fea- ture is on is the following: 1. set the compander-hold bit 2. wait the actual softstep time 3. change the volume 4. reset the compander-hold bit the softstep times are (in compander on condi- tion) automatically adapted to the attach time of the compander. in the following table the related softstep times are shown: attack-time softstep time 6ms 0.16ms 12ms 0.32ms 24ms 0.64ms 48ms 1.28ms db db -60 -50 -40 -30 -20 -10 0 0 -10 -20 -30 -40 -50 -60 input level output level -8db 15db -38db 2:1 figure 17. compander characteristics tda7462 13/25
s = start r/w = "0" -> receive mode (chip could be programmed by m p) "1" -> transmission mode (data could be received by m p) ack = acknowledge p = stop transmitted data (send mode) msb lsb xxxxstsmxx sm = soft mute activated st = stereo x = not used the transmitted data is automatic updated after each ack. transmission can be repeated without new chipaddress. reset condition a power on reset (por) is invoked if the supply voltage is below than 3.5v. after that the follow- ing data is written automatically into the registers of all subaddresses: msb lsb 11111110 the programming after por is marked bold-face / underlined in the programming tables. with this programming all the outputs are muted to v ref (v out = v dd /2). chip address subaddress data 1 ... data n 8 bit 8 bit 8 bit msb lsb msb lsb msb lsb s1000100r/wacki 3 i 2 i 1 i 0 a 3 a 2 a 1 a 0 ack data ack p i 2 c bus interface description interface protocol the interface protocol comprises: - a start condition (s) - a chip address byte (the lsb bit determines read / write transmission) - a subaddress byte - a sequence of data (n-bytes + acknowledge) - a stop condition (p) - the max. clock speed is 500kbits/s tda7462 14/25
subaddress (receive mode) msb lsb function i3 i2 i1 i0 a3 a2 a1 a0 0 1 compander hold 1 off on 0 1 autozero remain 2 off on 0 1 testmode 3 off on 0 1 auto-increment mode 4 off on 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 main selector main loudness volume bass-config./treble bass speaker attenuator lf speaker attenuator rf rear selector rear loudness speaker attenuator lr speaker attenuator rr subwoofer softmute/mixing compander configuration testing 1 for more information see compander section 2 for more information see autozero section 3 for more information see test programming block 4 if this bit is set to "1", the subaddress is automatically incremented after the transmission of a data-byte. therefore a transmission of more than one byte without sending the new subaddress is possible. tda7462 15/25
data byte specification main selector msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 source selector mono differential single ended 1 full differential single ended 2 pseudo differential single ended 3 mute beep 1 1 : 0 0 1 1 : 0 0 1 1 : 0 0 1 0 : 1 0 input gain 15db 14db : 1db 0db 0 1 pause source selector single ended 3 pseudo differential main loudness msb lsb loudness d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 attenuation 0db -1db : -14db -15db 0 1 filter on off (flat) 0 1 center frequency 400hz 800hz 0 1 loudness q first order second order 0 1 softstep volume off on note: the attenuation is specified at high frequencies. around the center frequency the value is different depending on the programmed attenuation (see loudness frequency response). tda7462 16/25
volume msb lsb attenuation d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 0 : 0 0 0 : 1 1 0 0 : 0 0 0 : 0 1 1 : 1 1 0 0 : 0 0 0 : 1 0 0 : 0 0 0 0 : 1 1 1 : 1 0 0 : 1 1 0 0 : 1 1 1 : 1 0 0 : 1 1 0 0 : 0 0 0 : 1 0 0 : 1 1 0 0 : 0 0 1 : 1 0 0 : 1 1 0 1 : 0 1 0 : 1 0 1 : 0 1 gain/attenuation +32.0db (note) +31.5db : +20.0db +19.5db +19.0db : +0.5db 0.0db - 0.5db : -79.0db -79.5db note: it is not recommended to use a gain more than 20db for system performance reason. in general, the max. gain should be lim ited by software to the maximum value, which is needed for the system. bass configuration. & treble programming msb lsb bass & treble attenuation d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 treble steps -14db -12db : -2db 0db 0db +2db : +12db +14db 0 0 1 1 0 1 0 1 treble center frequency 10.khz 12.5khz 15.0khz 17.5khz 0 0 1 1 0 1 0 1 bass center frequency 60hz 70hz 80hz 100hz tda7462 17/25
bass programming msb lsb bass attenuation d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 0 1 1 0 : 1 0 bass steps -15db -14db : -1 db 0 db 0 db +1 db : +14db +15db 0 0 1 1 0 1 0 1 bass q factor 1 1.25 1.5 2 0 1 bass dc-mode off on note: for more information please refer to section bass description speaker attenuation front (left & right channel) msb lsb attenuation/bass cf d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 0 0 0 0 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 0 0 : 0 1 1 1 1 1 1 1 1 0 0 : 1 0 0 0 0 1 1 1 1 0 0 : 1 0 0 1 1 0 0 1 1 0 1 : 1 0 1 0 1 0 1 0 1 attenuation 0db -1db : -23db -24.5db -26db -28db -30db -32db -35db -40db -50db speaker mute 0 1 bass center-frequency (only speaker lf) 1) bass 150hz bass 100hz for this bass center-frequency must be programmed to 100hz tda7462 18/25
rear selector msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 source selector mono differential single ended 1 full differential single ended 2 pseudo differential single ended 3 mute beep 1 1 : 0 0 1 1 : 0 0 1 1 : 0 0 1 0 : 1 0 input gain 15db 14db : 1db 0db 1 must be "1" rear loudness msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 attenuation 0db -1db : -14db -15db 0 1 filter on off 0 1 center frequency 400hz 800hz 0 1 loudness order first order second order 0 1 beep frequency 781hz 1.56khz note: the programming of the main- and rear-selector as well as the main- and rear-loudness is exactly the same, except the msb s. tda7462 19/25
speaker attenuation rear (left & right channel) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 0 0 0 0 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 0 0 : 0 1 1 1 1 1 1 1 1 0 0 : 1 0 0 0 0 1 1 1 1 0 0 : 1 0 0 1 1 0 0 1 1 0 1 : 1 0 1 0 1 0 1 0 1 atenuation 0db -1db : -23db -24.5db -26db -28db -30db -32db -35db -40db -50db speaker mute 0 1 input signal for rear speaker (only spkr lr) 1) rear channel main channel 0 1 subw. low-pass frequency (only spkr rr) 80hz 115hz 0 1 input signal for subwoofer (only spkr rr) 2) rear channel main channel 1) see figure 16 switch rearsel 2) see figure 16 switch subwsel tda7462 20/25
softmute and mixing msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 mute enable softmute disable softmute 0 0 1 1 0 1 0 1 mute times 0.48ms 0.96ms 30.7ms 122.8ms 0 1 mixing source rear-selector phone 0 0 1 1 0 1 0 1 mixing level (main/mix-source) -12/-2.5db -6/-6db -3.5/-9.6db 0/ 0 0 1 1 0 1 0 1 cd full-differential gain -12db -6db -6db 0db subwoofer msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 0 0 0 0 0 0 0 1 0 0 : 1 1 1 1 1 1 1 1 1 0 0 : 0 1 1 1 1 1 1 1 1 0 0 : 1 0 0 0 0 1 1 1 1 0 0 : 1 0 0 1 1 0 0 1 1 0 1 : 1 0 1 0 1 0 1 0 1 attenuation 0db -1db : -23db -24.5db -26db -28db -30db -32db -35db -40db -50db speaker mute 0 1 subwoofer phase 180 0 0 1 subwoofer low-pass filter off on tda7462 21/25
compander msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 activity off on 0 0 1 1 0 1 0 1 attack times 6ms 12ms 24ms 49ms 0 0 1 1 0 1 0 1 release times 195ms 390ms 780ms 1.56s 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 0 0 1 1 0 1 0 1 softstep time 1) 160 m s 320 m s 640 m s 1.28ms 2.56ms 5.12ms 10.2ms 20.4ms 0 1 max. compander gain 23db 19db 0 1 compander input rear selector (after rear ingain) front selector (after front ingain) 1) only possible if the compander is off (bit d0 set to 0) configuration msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 pause detector off on 0 0 1 1 0 1 0 1 pause zc window 160mv 80mv 40mv 20mv 0 1 voice-band low-pass enable filter off filter on 0 1 voice-band low-pass frequency 3khz 6khz 0 1 voice-band high-pass enable filter off filter on 0 0 1 1 0 1 0 1 high-pass cut-off-frequency 90hz 180hz 130hz 260hz tda7462 22/25
testing msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 main testmode switch 1) off on 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 test multiplexer compander log-amp. output compander low-pass output compander dac output internal 200khz clock not allowed not allowed internal bandgap voltage not allowed 0 1 compander testmode off on 0 1 clock external internal 1 1 must be "1" 1) to avoid inadvertently programming of the main-testmode as well the compander testmode it is mandatory to set the bit 5 in t he subaddress-byte to high at the same time. = v cc 9v se1l se1r 100nf 100nf md+ md- 100nf 100nf cdl+ 100nf cdl- 100nf tapel taper phone+ phone- cdl+ cdl- cdr- 100nf cdr- subout+ 100nf subout+ subout- 100nf subout- outrr outlr outlr outrf outrf outlf outlf 22 d98au867 mute scl sda sm scl sda 100nf pdr pause 23 9 se3l se3r 100nf 100nf v s gnd 21 20 19 18 17 25 24 26 outrr cdr+ 100nf cdr+ 8 7 6 5 4 3 2 1 47nf 28 27 cref 10 m f 14 10 m f + - 15 16 ammono pause 22 m f pdgnd 10 100nf pdl 11 100nf 100nf 13 12 se2r se2l stdl stdr extr extgnd extl figure 18. application circuit. tda7462 23/25
so28 dim. mm inch min. typ. max. min. typ. max. a 2.65 0.104 a1 0.1 0.3 0.004 0.012 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.013 c 0.5 0.020 c1 45 (typ.) d 17.7 18.1 0.697 0.713 e 10 10.65 0.394 0.419 e 1.27 0.050 e3 16.51 0.65 f 7.4 7.6 0.291 0.299 l 0.4 1.27 0.016 0.050 s8 (max.) outline and mechanical data tda7462 24/25
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this pu blication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectron ics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicr oelectronics. the st logo is a registered trademark of stmicroelectronics ? 2001 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com tda7462 25/25
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