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1/57 tda7405 may 2004 1 features 3 stereo inputs 3 mono inputs dynamic-compression-stage for cd bass, treble and loudness control eq-filters for separate front/rear- equalization voice-band-filter for mixing-channel direct mute and softmute internal beep four independent speaker-outputs independent second source-selector full mixing capability pause detector 1.1 stereodecoder rds mute no external adjustments am/fm noiseblanker with several trigger controls programmable multipath detector quality detector output 1.2 digital control: i 2 c-bus interface 2 description the device includes a high performance audioprocessor and a stereodecoder-noiseblanker combination with the whole low frequency signal processing necessary for state-of-the-art as well as future carradios. the digital control allows a programming in a wide range of all the filter characteristics. also the stereodecoder part offers several possibilities of programming especially for the adaptation to different if-devices. equalizer carradio signal processor figure 2. block diagram rev. 2 figure 1. package t able 1. order codes part number package tda7405 tqfp44 tqfp44
tda7405 2/57 table 2. supply table 3. thermal data table 4. absolute maximum ratings 3 esd all pins are protected against esd according to the mil883 standard. figure 3. pin connection (top view ) symbol parameter test condition min. typ. max. unit v s supply voltage 7.5 9 10.5 v i s supply current v s = 9v 45 65 85 ma svrr ripple rejection @ 1khz audioprocessor(all filters flat) 60 db stereodecoder + audioprocessor 55 db symbol parameter value unit r th j-pins thermal resistance junction-pins max 65 c/w symbol parameter value unit v s operating supply voltage 10.5 v t amb operating temperature range -40 to 85 c t stg storage temperature range -55 to +150 c
3/57 tda7405 figure 4. block diagram (enlarged view)
tda7405 4/57 4 audioprocessor part features: input multiplexer 2 fully differential cd stereo inputs with programmable attenuation 1 single-ended stereo input 2 differential mono input 1 single-ended mono input in-gain 0..15db, 1db steps internal offset-cancellation (autozero) separate second source-selector beep internal beep with 3 frequencies + diagnostic setting (19khz tone) mixing stage beep, phone,navigation and fm mixable to all speaker-outputs (see figure 20) programmabe voice-band filter loudness programmable center frequency and frequency response 15 x 1db steps selectable flat-mode (constant attenuation) volume 0.5db attenuator 100db range soft-step control with programmable times bass 2nd order frequency response center frequency programmable in 8 steps dc gain programmable 15 x 0.5db steps treble 2nd order frequency response center frequency programmable in 4 steps 15 x 1db steps equalizer two stereo equalizing-filters for separate front/rear adaption 1st filter center-frequency programmable in 16 steps (4 steps/octave, min 63hz, max 840hz) 2nd filter center-frequency programmable in 16 steps (4 steps/octave, min 300hz, max 4khz) quality factor programmable in 4 steps 15 x 1db steps selectable flat-mode speaker 4 independent speaker controls in 1db steps control range 95db separate mute mute functions direct mute digitally controlled softmute with 4 programmable mute-times pause detector programmable threshold compander dynamic range compression for use with cd 2:1 compression rate programmable max. gain
5/57 tda7405 table 5. electrical characteristics (v s =9v; t amb =25c; r l =10k ? ; all gains=0db; f=1khz; unless otherwise specified) symbol parameter test condition min. typ. max. unit input selector r in input resistance all single ended inputs 70 100 130 k ? v cl clipping level 2.0 2.2 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 steps -5 1 5 mv g min to g max -10 1 10 mv v offset remaining offset with autozero 0.5 mv differential stereo inputs r in input resistance (see fig. 1) differential 70 100 130 k ? g cd gain only at true differential input -1 0 1 db -5 -6 -7 db -11 -12 -13 db cmrr common mode rejection ratio v cm = 1v rms @ 1khz 46 70 db v cm = 1v rms @ 10khz 46 60 db e no output-noise @ speaker-outputs 20hz - 20khz, flat; all stages 0db 9 15 v differential mono inputs r in input impedance differential 40 56 72 k ? cmrr common mode rejection ratio v cm = 1v rms @ 1khz 46 70 db v cm = 1v rms @ 10khz 46 60 db beep control v rms beep level mix-gain = 6db 250 350 1) 500 mv f beep beep frequency f beep1 470 500 530 hz f beep2 740 780 820 hz f beep3 1.7 1.8 1.9 khz f beep4 18 19 20 khz 1. the level for the 19khz-testtone is 2.1v rms mixing control m level mixing ratio main / mix-source -6/-6 db g max max. gain 13 15 17 db a max max. attenuation -83 -79 -75 db a step attennuation step 0.5 1 1.5 db
tda7405 6/57 multiplexer output 2 ) r out output impedance 800 1000 ? r l output load capacitance 2 k ? c l 10 nf v dc dc voltage level 4.3 4.5 4.7 v 2. if confgured as multiplexer-output loudness control a step step resolution 0.5 1 1.5 db a max max. attenuation -21 -19 -17 db f peak peak frequency f p1 180 200 220 hz f p2 360 400 440 hz f p3 540 600 660 hz f p4 720 800 880 hz 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 soft mute a mute mute attenuation 80 100 db t d delay time t1 0.48 1 ms t2 0.96 2 ms t3 70 123 170 ms t4 200 324 600 ms v th low low threshold for sm-pin 3) 1v v th high high threshold for sm - pin 2.5 v r pu internal pull-up resistor 32 45 58 k ? v pu internal pull-up voltage 3.3 v 3. the sm-pin is active low (mute = 0) bass control c range control range 14 + 15.5 16 db a step step resolution 0.1 0.5 1.0 db table 5. electrical characteristics (continued) (v s =9v; t amb =25c; r l =10k ? ; all gains=0db; f=1khz; unless otherwise specified) symbol parameter test condition min. typ. max. unit
7/57 tda7405 f c center frequency f c1 54 60 66 hz f c2 63 70 77 hz f c3 72 80 88 hz f c4 81 90 99 hz f c5 90 100 110 hz f c6 117 130 143 hz f c7 135 150 165 hz f c8 180 200 220 hz q bass quality factor q 1 0.9 1 1.1 q 2 1.1 1.25 1.4 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 14 + 15 16 db a step step resolution 0.5 1 1.5 db f c center frequency f c1 81012khz f c2 10 12.5 15 khz f c3 12 15 18 khz f c4 14 17.5 21 khz pause detector 4) v th zero crossing threshold window 1 40 mv window 2 80 mv window 3 160 mv i delay pull-up current 15 25 35 a v thp pause threshold 3.0 v 4. if configured as pause-output speaker attenuators r in input impedance 35 50 65 k ? g max max. gain 14 15 16 db a max max. attenuation -83 -79 -75 db a step step resolution 0.5 1 1.5 db a mute output mute attenuation 80 90 db table 5. electrical characteristics (continued) (v s =9v; t amb =25c; r l =10k ? ; all gains=0db; f=1khz; unless otherwise specified) symbol parameter test condition min. typ. max. unit
tda7405 8/57 e e attenuation set error 2db v dc dc steps adjacent attenuation steps 0.1 5 mv mono voice bandpass f hp highpass corner frequency f hp1 81 90 99 hz f hp2 120 135 150 hz f hp3 162 180 198 hz f hp4 193 215 237 hz f hp5 270 300 330 hz f hp6 405 450 495 hz f hp7 540 600 660 hz f hp8 675 750 825 hz f lp lowpass corner frequency f lp1 2.7 3 3.3 khz f lp2 5.4 6 6.6 khz compander g max max. compander gain vi < -46db 19 db vi < -46db, anti-clip=on 29 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 390 ms t rel2 780 ms t rel3 1.17 s t rel4 1.56 s v ref compander reference input- level (equals 0db) v ref1 0.5 v rms v ref2 1.0 v rms v ref3 2.0 v rms c f compression factor output signal / input signal 0.5 audio outputs v clip clipping level d = 0.3% 2.0 2.2 v rms r l output load resistance 2 k ? c l output load capacitance 10 nf r out output impedance 30 120 ? v dc dc voltage level 4.3 4.5 4.7 v table 5. electrical characteristics (continued) (v s =9v; t amb =25c; r l =10k ? ; all gains=0db; f=1khz; unless otherwise specified) symbol parameter test condition min. typ. max. unit
9/57 tda7405 general e no output noise bw = 20hz - 20khz;output muted 3 15 v bw = 20hz - 20khz all gains = 0db single ended inputs 10 20 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 out = 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 table 5. electrical characteristics (continued) (v s =9v; t amb =25c; r l =10k ? ; all gains=0db; f=1khz; unless otherwise specified) symbol parameter test condition min. typ. max. unit
tda7405 10/57 5 description of the audioprocessor part 5.1 input stages in the basic configuration two full-differential, two mono-differential, one single ended stereo and one single- ended mono input are available. in addition a dedicated input for the stereodecoder mpx-signal is present. figure 5. input stages 5.1.1 full-differential stereo input 1 (fd1) the fd1-input is implemented as a buffered full-differential stereo stage with 100k ? input-impedance at each input. the attenuation is programmable in 3 steps from 0 to -12db in order to adapt the incoming signal level. a 6db attenuation is included in the differential stage, the additional 6db are done by a following resistive divid- er. this input is also configurable as two single-ended stereo inputs (see pin-out). 5.1.2 full-differential stereo input 2 (fd2) the fd2-input has the same general structure as fd1, but with a programmable attenuation of 0 or 6db em- bedded in the differential stage.
11/57 tda7405 5.1.3 mono-differential input 1 (md1) the md1-input is designed as a basic differential stage with 56k ? input-impedance. this input is configurable as a single-ended stereo input (see pin-out). 5.1.4 mono-differential input 2 (md2) the md2-input has the same topology as md1, but without the possib ility to configure it to single e nded. 5.1.5 single-ended stereo input (se1), single-ended mono input (am) and fm-mpx input all single ended inputs offer an input impedance of 100kw. the am-pin can be connected by software to the input of the stereodecoder in order to use the am-noiseblanker and am-high-cut feature. 5.2 autozero the autozero allows a reduction of the number of pins as well as external components by canceling any offset generated by or before the in-gain-stage (please notice that externally generated offsets, e.g. generated through the leakage current of the coupling capacitors, are not canceled). the auto-zeroing is started every time the data-byte 0 is selected and needs max. 0.3ms for the alignment. to avoid audible clicks the audioprocessor is muted before the loudness stage during this time. the autozero- feature is only present in the main signal-path. 5.2.1 autozero for stereodecoder-selection a special procedure is recommended for selecting the stereodecoder at the main input-selector to guarantee an optimum offset-cancellation: (step 0: softmute or mute the signal-path) step 1: temporary deselect the stereodecoder at all input-selectors step 2: configure the stereodecoder via iic-bus step 3: wait 1ms step 4: select the stereodecoder at the main input-selector first the root cause of this procedure is, that after muting the stereodecoder (step 1), the internal stereodecoder filters have to settle in order to perform a proper offset-cancellation. 5.2.2 autozero-remain in some cases, for example if the p is executing a refresh cycle of the iic-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 applications the a631 could be switched in the autozero-remain-mode (bit 6 of the subad- dress-byte). if this bit is set to high, the databyte 0 could be loaded without invoking the autozero and the old adjustment-value remains. 5.3 pause detector / mux-output the pin number 40(pause/mux) is configurable for two different functions: 1. during pause-detector off this pin is used as a mono-output of the main input-selector. this signal is often used to drive a level-/equalizer-display on the carradio front-panel. 2. during pause-detector on the pin is used to define the time-constant of the detector by an external ca- pacitor. the pause-detector is driven by the internal stereodecoder-outputs in order to use pauses in the fm-signal for alternate-frequency-jumps. if the signal-level of both stereodecoder channels is outside the programmed volt- age-window, the external capacitor is abruptly discharged. inside the pause-condition the capacitor is slowly re- charged by a constant current of 25a. the pause information is also available via iic-bus (see iic-bus programming).
tda7405 12/57 5.4 loudness there are four parameters programmable in the loudness stage: 5.4.1 attenuation figure 6 shows the attenuation as a function of frequency at fp = 400hz. figure 6. loudness attenuation @ fp = 400hz 5.4.2 peak frequency figure 7 shows the four possible peak-frequencies at 200, 400, 600 and 800hz figure 7. loudness center frequencies @ attn. = 15db d b hz -25.0 -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k d b hz -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k
13/57 tda7405 5.4.3 loudness order different shapes of 1st and 2nd-order loudness figure 8. 1st and 2nd order loudness @ attn. = 15db, fp=400hz 5.4.4 flat mode in flat mode the loudness stage works as a 0db to -19db attenuator. 5.5 softmute the digitally controlled softmute stage allows muting/demuting the signal with a i2c-bus programmable slope. the mute process can either be activated by the softmute pin or by the i2c-bus. this slope is realized in a spe- cial s-shaped curve to mute slow in the critical regions (see figure 9). for timing purposes the bit of the i2c- bus output register is set to 1 from the start of muting until the end of de-muting. figure 9. softmute-timing note: please notice that a started mute-action is always terminated and could not be interrupted by a change of the mute -signa l. d b hz -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k
tda7405 14/57 5.6 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 audiosignal. 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. figure 10. softstep-timing note: for steps more than 0.5db the softstep mode should be deactivated because it could generate a hard 1db step during the bl end-time 5.7 bass there are four parameters programmable in the bass stage: 5.7.1 attenuation figure 11 shows the attenuation as a function of frequency at a center frequency of 80hz. figure 11. bass control @ fc = 80hz, q = 1 1db 0.5db - 0.5db -1db ss time -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k d b hz
15/57 tda7405 5.7.2 center frequency figure 12 shows the eight possible center frequencies 60, 70, 80, 90, 100, 130, 150 and 200hz. figure 12. bass center frequencies @ gain = 14db, q = 1 5.7.3 quality factors figure 13 shows the four possible quality factors 1, 1.25, 1.5 and 2. figure 13. bass quality factor s @ gain = 14db, fc = 80hz d b hz 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k 0.0 2.5 5.0 7.5 1 0.0 1 2.5 15.0 10.0 100.0 1.0k 10.0k
tda7405 16/57 5.7.4 dc mode in this mode the dc-gain is increased by 4.4db. in addition the programmed center frequency and quality factor is decreased by 25% which can be used to reach alternative center frequencies or quality factors. figure 14. bass normal and dc mode @ gain = 14db, fc = 80hz note: the center frequency, q and dc-mode can be set fully independently. 5.8 treble there are two parameters programmable in the treble stage: 5.8.1 attenuation figure 15 shows the attenuation as a function of frequency at a center frequency of 17.5khz. figure 15. treble control @ fc = 17.5khz 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k -15.0 - 10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k
17/57 tda7405 5.8.2 center frequency figure 16 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5khz. figure 16. treble center frequencies @ gain = 14db 5.9 eq-filter there are two eq-filters present in the a631: one for the high-frequency-range and one for the low-frequen- cy-range with a certain overlap. they are programmable in center-frequeny (4 frequencies/octave), in q(4 set- tings) and in attenuation (1db-steps). in addition several configurations are possible to use the filters in the front- or rear-path. table 6. gain, center frequency and quality factor of equalizer filters parameter min max unit gain -15 15 db center frequency filter 1 63 840 hz center frequency filter 2 300 4000 hz quality factor 1 4 0.0 2.5 5.0 7.5 1 0.0 1 2.5 15.0 10.0 100.0 1.0k 10.0k
tda7405 18/57 5.9.1 equalizer-setup the two filters can be configured in multiple ways in order to cover as most as possible applications. both filters can be programmed to be either in the front- or in the rear-path, respectively. this feature enables to have e.g. the high-filter in the front- and both filters in the rear-path. figure 17. equalizer configuration 5.9.2 attenuation figure 18 shows the attenuation as a function of frequency at a center frequency of 625 hz. figure 18. gain/attenuation of eq-filter 2e+01 2e+0 4 1e+02 1e+04 1e+03 hz - 15 15 - 10 10 -5 5 0 db
19/57 tda7405 5.9.3 frequencies figure 19 shows the different center frequencies of the eq-filter at 12 db gain figure 19. center-frequencies of eq-filter 5.9.4 q-factor figure 20 shows the four possible quality factors 1, 2, 3 and 4. figure 20. different q-factors of equalizer-filter 2e+01 2e+0 4 1e+02 1e+04 1e+03 hz -2 14 0 12 2 10 4 8 6 d b 2e+01 2e+0 4 1e+02 1e+04 1e+03 hz - 2 1 4 0 1 2 2 1 0 4 8 6 d b
tda7405 20/57 5.10 compander 5.10.1signal-compression a fully integrated signal-compressor with programmable attack- and decay-times is present in the a631 (see figure 20). the compander consists of a signal-level detection, an a/d-converter plus adder and the normal softstep-volume-stage. first of all the left and the right ingain-signal is rectified, respectively, and the logarithm is build from the summed signal. the following low-pass smooth the output-signal of the logarithm-amplifier and improves the low-frequency suppression. the low-pass output-voltage then is a/d-converted an added to the current volume-word defined by the iic-bus. assuming reference-level or higher at the compander input, the output of the adc is 0. at lower levels the voltage is increasing with 1 bit/db. it is obvious that with this config- uration and a 0.5db-step volume-stage the compression rate is fixed to 2:1 (1db less at the input leads to 0.5db less at the output). the internal reference-level of the compander is programmable in three steps from 0.5v rms to 2v rms . for a proper behavior of the compression-circuit it is mandatory to have at a 0db input-signal exactly the programmed reference-level after the ingain-stage. e.g. at a configured reference-level of 0.5v rms the out- put of the ingain-stage has to have also 0.5v rms at 0db source-signal (usually the 0db for cd is defined as the maximum possible signal-level). to adapt the external level to the internal reference-level the programmable attenuation in the differential-stages and the ingain can be used. figure 21. compander block diagram 5.10.2anti-clipping in a second application the compander-circuit can be used for a anti-clipping or limiting function. in this case one of the dedicated inputs (am or mpin) is connected directly to the clip-detector of the power-amplifier. if no clipping is detected, the open-collector output of the power-amplifier is highohmic and the input-voltage of the rectifier is v ref . the level-detector interprets this as a very small signal and reacts with the maximum programmed compander-gain. in the application this gain has to be compensated by decreasing the volume with the same value in order to get the desired output-level. in clipping situation the open-collector-current generates a voltage-drop at the rectifier-input, which forces the compander to decrease the gain until the clipping disappears. it is even possible to run the compression-mode and the anti-clipping mode in parallel. in this case the maxi- mum compander-gain should be set to 29 db.
21/57 tda7405 5.10.3characteristic to achieve the desired compression characteristic like shown below the volume has to be decreased by 4db. figure 22. compander characteristic 5.10.4i2c -bus-timing when the compander is active a volume- word coming from this stage is added to the i2c-bus volume-word and the volume is changed with a soft slope between adjacent steps (softstep-stage). as mentioned in the de- scription of this stage it is not recommended to change the volume during this slope. to avoid this behaviour- while the compander is working, and the volume has to be changed, the compander-hold-bit is implemented (bit 7 in the subaddress-byte). the recommended timing for changing the volume during compander-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 condition automatically adapted to the attack-time of the compander. in the following table the related softstep-times are shown: 5.10.5ac-coupling in some applications additional signal manipulations are desired, for example surround-sound or more-band- equalizing. for this purpose an ac-coupling is placed before the speaker-attenuators, which can be activated or internally shorted by i2c-bus. in short condition the input-signal of the speaker-attenuator is available at the ac-outputs. the input-impedance of this ac-inputs is 50k ? . 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 -6 0 input level o utput level -8db 15db -38db 2:1
tda7405 22/57 5.10.6output selector the output-selector allows to connect the main- or the second-source to the front-, rear-speaker-attenuator, respectively. as an example of this programming the device is able to connect via software the main-source to the back (rear) and the second-source to the front (see figure 23). figure 23. output selector 5.10.7speaker-attenuator and mixing a mixing-stage is placed after each speaker-attenuator and can be set independently to mixing-mode. having a full volume for the mix-signal the stage offers a wide flexibility to adapt the mixing levels. figure 24. mixing configuration 5.10.8audioprocessor testing during the testmode, which can be activated by setting bit d 0 of the stereodecoder testing-byte and the audio- processor testing byte, several internal signals are available at the fd2r- pin. during this mode the input re- sistance of 100kohm is disconnected from the pin. the internal signals available are shown in the data-byte specification.
23/57 tda7405 6 stereodecoder-part 6.1 features: no external components necessary pll with adjustment free, fully integrated vco automatic pilot dependent mono/stereo switching very high suppression of intermodulation and interference programmable roll-off compensation dedicated rds-softmute highcut- and stereoblend-characterisctics programmable in a wide range fm/amnoiseblanker with several threshold controls multipath-detector with programmable internal/external influence i 2 c-bus control of all necessary functions table 7. electrical characteristics v s = 9v, deemphasis time constant = 50s, mpx input voltage v mpx = 500mv (75khz deviation), modulation frequency = 1khz, input gain = 6db, t amb = 27c, unless otherwise specified. symbol parameter test conditions min. typ. max. unit v in mpx input level input gain = 3.5db 0.5 1.25 v rms r in input resistance 70 100 130 k ? g min min. input gain 1.5 3.5 4.5 db g max max. input gain 8.5 11 12.5 db g step step resolution 1.75 2.5 3.25 db svrr supply voltage ripple rejection v ripple = 100mv, f = 1khz 55 db max. channel separation 30 50 db thd total harmonic distortion f in =1khz, mono 0.02 0.3 % signal plus noise to noise ratio a-weighted, s = 2v rms 80 91 db mono/stereo-switch v pthst1 pilot threshold voltage for stereo, pth = 1 10 15 25 mv v pthst0 pilot threshold voltage for stereo, pth = 0 15 25 35 mv v pthmo1 pilot threshold voltage for mono, pth = 1 7 12 17 mv v pthmo0 pilot threshold voltage for mono, pth = 0 10 19 25 mv pll ? f/f capture range 0.5 % deemphasis and highcut sn + n - ---------- ---
tda7405 24/57 deempf m deemphasis timeconstants fm v level >> v hch 25 50 75 s v level >> v hch 44 62.5 80 s v level >> v hch 50 75 100 s v level >> v hch 70 100 130 s m fm highcut timeconstant multiplier fm v level << v hcl 3 deempa m deemphasis timeconstants am v level >> v hch 37.5 s v level >> v hch 47 s v level >> v hch 56 s v level >> v hch 75 s m am highcut timeconstant multiplier am v level << v hcl 3.7 ref5v internal reference voltage 4.7 5 5.3 v l min min. level gain -1 0 1 db l maxs max. level gain 5 6 7 db l gstep level gain step resolution see section 2.7 0.2 0.4 0.6 db vsbl min min. voltage for mono see section 2.8 17 20 23 %ref5v vsbl max max. voltage for mono see section 2.8 62 70 78 %ref5v vsbl step step resolution see section 2.8 1.6 3.3 5.0 %ref5v vhch min min. voltage for no highcut see section 2.9 37 42 47 %ref5v vhch max max. voltage for no highcut see section 2.9 58 66 74 %ref5v vhch step step resolution see section 2.9 4.2 8.4 12.6 %ref5v vhcl min min. voltage for full high cut see section 2.9 15 17 19 %vhch vhcl max max. voltage for full high cut see section 2.9 29 33 37 %vhch vhcl step step resolution see section 2.9 2.1 4.2 6.3 %ref5v carrier and harmonic suppression at the output 19 pilot signalf=19khz 40 50 db 38 subcarrier f=38khz 75 db 57 subcarrier f=57khz 62 db 76 subcarrier f=76khz 90 db intermodulation (note 1) table 7. electrical characteristics (continued) v s = 9v, deemphasis time constant = 50s, mpx input voltage v mpx = 500mv (75khz deviation), modulation frequency = 1khz, input gain = 6db, t amb = 27c, unless otherwise specified. symbol parameter test conditions min. typ. max. unit
25/57 tda7405 7 notes to the characteristics note 1. intermodulation suppression measured with: 91% pilot signal; fm = 10 khz or 13 khz. note 2. traffic radio (v.f.) suppression measured with: 91% stereo signal; 9% pilot signal; fm=1khz; 5% subcarrier (f=57khz, fm=23hz am, m=60%) note 3. sca ( subsidiary communications authorization ) measured with: 81% mono signal; 9% pilot signal; fm=1khz; 10%sca - subcarrier ( fs = 67khz, unmodulated ). 2f mod =10khz, f spur =1khz 65 db 3f mod =13khz, f spur =1khz 75 db traffic radio (note 2) 57 signal f=57khz 70 db sca - subsidiary communications authorization (note 3) 67 signal f=67khz 75 db aci - adjacent channel interference (note 4) 114 signal f=114khz 95 db 190 signal f=190khz 84 db table 7. electrical characteristics (continued) v s = 9v, deemphasis time constant = 50s, mpx input voltage v mpx = 500mv (75khz deviation), modulation frequency = 1khz, input gain = 6db, t amb = 27c, unless otherwise specified. symbol parameter test conditions min. typ. max. unit 2 v o signal () at1khz () v o spurious () at1khz () ---------------------------------------------------------------- ? s ; 210khz ? () 19kh z ? == 3 v o signal () at1khz () v o spurious () at1khz () ---------------------------------------------------------------- ? s ; 313khz ? () 38kh z ? == 57 v.w.f. () v o signal () at1khz () v o spurious () at1khz23khz () ---------------------------------------------------------------------------------- -- - = 67 v o signal () at1khz () v o spurious () at9khz () --------------------------------------------------------------- - ? s ; 338khz ? () 67kh z ? ==
tda7405 26/57 note 4. aci ( adjacent channel interference ) measured with: 90% mono signal; 9% pilot signal; fm=1khz; 1% spurious signal (f s = 110khz or 186khz, un- modulated). 8 noise blanker part 8.1 features: am and fm mode internal 2nd order 140khz high-pass filter for mpx path internal rectifier and filters for am-if path programmable trigger thresholds trigger threshold dependent on high frequency noise with programmable gain additional circuits for deviation- and fieldstrength-dependent trigger adjustment 4 selectable pulse suppression times for each mode programmable noise rectifier charge/discharge current table 8. electrical characteristics all parameters mesured in fm mode if not otherwise specified. symbol parameter test conditions min. typ. max. unit v tr trigger threshold 5) meas.with v peak =0.9v 111 30 mv op 110 35 mv op 101 40 mv op 100 45 mv op 011 50 mv op 010 55 mv op 001 60 mv op 000 65 mv op v trnoise noise controlled trigger threshold meas.with v peak =1.5v 00 260 mv op 01 220 mv op 10 180 mv op 11 1 40 mv op 114 v o signal () at1khz () v o spurious () at4khz () --------------------------------------------------------------- - ? s ; 110kh z 3 38khz ? () ? == 190 v o signal () at1khz () v o spurious () at4khz () --------------------------------------------------------------- - ? s ; 186kh z 5 38khz ? () ? ==
27/57 tda7405 5. all thresholds are measured using a pulse with t r = 2 s, thigh= 2 s and t f = 10 s. the repetition rate must not increase the peak voltage. v rect rectifier voltage v mpx =0mv 0.5 0.9 1.3 v v mpx =50mv, f=150khz 1.5 1.7 2.1 v v mpx =200mv, f=150khz 2 2.5 2.9 v v rect dev deviation dependent rectifier voltage meas.with v mpx =500mv (75khz dev.) 11 10 01 00 0.5 0.9 1.7 2.5 0.9 (off) 1.2 2.0 2.8 1.3 1.5 2.3 3.1 v op v op v op v op v rect fs fieldstrength controlled rectifier voltage meas.with v mpx =0mv, v level << v sbl (fully mono) 11 10 01 00 0.5 0.9 1.7 2.1 0.9 (off) 1.4 1.9 2.4 1.3 1.5 2.3 3.1 v v v v t sfm suppression pulse duration fm signal holdn in testmode 00 01 10 11 38 25.5 32 22 s s s s t sam suppression pulse duration am signal holdn in testmode 00 01 10 11 1.2 800 1.0 640 ms s ms s v rectadj noise rectifier discharge adjustment signal peak in testmode 00 01 10 11 0.3 0.8 1.3 2.0 v/ms sr peak noise rectifier charge signal peak in testmode 0 1 10 20 mv/s v adjmp noise rectifier adjustment through multipath signal peak in testmode 00 01 10 11 0.3 0.5 0.7 0.9 v/ms r amif am if input resistance 35 50 65 kohm g amif,min min. gain am if signal am-rectifier in testmode 6db g amif,max max. gain am if 20 db g amif,step step gain am if 2 db f amif,min min. f c am if signal am-rectifier in testmode 14 khz f amif,max max. f c am if 56 khz table 8. electrical characteristics (continued) all parameters mesured in fm mode if not otherwise specified. symbol parameter test conditions min. typ. max. unit
tda7405 28/57 figure 25. noiseblanker test-pulse figure 26. trigger threshold vs. vpeak time v in t r t high t f v op dc vth min. trig. threshold noise controlled trig. threshold 1.5v 0.9v 260mv (00) 220mv (01) 180mv (10) 140mv (11) 8 steps 65mv 30mv v peak [v ]
29/57 tda7405 figure 27. figure 28. fieldstrenth controlled trigger adjustment 0.9 deviation [khz ] 2.8 2.0 1.2 20 32.5 45 75 v peak 00 01 10 detector off (11) [v ] op 0.9v noisy signal good signal noise 2.4v (00) mono stereo 1.9v (01) 1.4v (10) atc_sb off (11) e ' v peak 3v
tda7405 30/57 9 multipath detector 9.1 features: internal 19khz band-pass filter programmable band-pass- and rectifier-gain selectable internal influence on stereoblend and/or highcut 10 functional description of stereodecoder figure 29. blockdiagram of the stereodecoder table 9. electrical characteristics symbol parameter test conditions min. typ. max. unit f cmp center frequency of multipath- bandpass stereodecoder locked on pilottone 19 khz g bpmp bandpass gain g1 6 db g2 12 db g3 16 db g4 18 db g rectmp rectifier gain g1 7.6 db g2 4.6 db g3 0 db i chmp rectifier charge current 0.25 0.5 a i dismp rectifier discharge current 4 ma quality detector a multipath influence factor 00 01 10 11 0.70 0.85 1.00 1.15
31/57 tda7405 the stereodecoder-part of the a631 (see figure 28) contains all functions necessary to demodulate the mpx- signal like pilottone-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 fieldstrength input allow to use different if-devices. 10.1 stereodecoder-mute the a631 has a fast and easy to control rds-mute function which is a combination of the audioprocessor's soft- mute and the high-ohmic mute of the stereodecoder. if the stereodecoder is selected and a softmute command is sent (or activated through the sm-pin) the stereodecoder w ill be set automatically to the high-ohmic mute con- dition after the audio-signal has been softmuted. hence a checking of alternate frequencies could be performed. additionally the pll can be set to "hold"-mode, which disables the pll input during the mute time. to release the system from the mute condition simply the unmute-command must be sent: the stereodecoder is unmuted immediately and the audioprocessor is softly unmuted. figure 30 shows the output-signal vo as well as the in- ternal stereodecoder mute signal. this influence of softmute on the stereodecoder mute can be switched off by setting bit 3 of the softmute byte to "0". a stereodecoder mute command (bit 0, stereodecoder byte set to "1") will set the stereodecoder in any case independently to the high-ohmic mute state. if any other source than the stereodecoder is selected the decoder remains muted and the mpx-pin is connect- ed to v ref to avoid any discharge of the coupling capacitor through leakage currents. no further mute command should be applied. figure 30. signals during stereodecoder's softmute figure 31. signal-control via softmute-pin
tda7405 32/57 10.2 ingain + infilter the ingain stage allows to adjust the mpx-signal to a magnitude of about 1vrms internally which is the recom- mended value. 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 filter for the following switch capacitor filters. 10.3 demodulator in the demodulator block the left and the right channel are separated from the mpx-signal. in this stage also the 19-khz pilottone is cancelled. for reaching a high channel separation the a631 offers an i 2 c-bus programmable roll-off adjustment which is able to compensate the lowpass behavior of the tuner section. if the tuner's attenu- ation at 38khz is in a range from 7.2% to 31.0% the a631 needs no external network in front of the mpx-pin. within this range an adjustment to obtain at least 40 db channel separation is possible. the bits for this adjust- ment are located together with the fieldstrength adjustment in one byte. this gives the possib ility to perform an optimization step during the production of the carradio where the channel separation and the fieldstrength con- trol are trimmed. the setup of the stereoblend characteristics which is programmable in a wide range is de- scribed in 2.8. 10.4 deemphasis and highcut the deemphasis-lowpass allows to choose a time constant between 37.5 and 100s. the highcut control range will be 2 x t deemp or 2.7 x t deemp dependent on the selected time constant (see programming section). the bit d7 of the hightcut-byte will shift timeconstant and range. inside the highcut control range (between vhch and vhcl) the level signal is converted into a 5 bit word which controls the lowpass time constant between t deemp...3 (3.7) x t deemp . thereby the resolution will remain always 5 bits independently of the absolute voltage range between the vhch- and vhcl-values. in addition the maximum attenuation can be fixed between 2 and 10db. the highcut function can be switched off by i 2 c-bus (bit d7, highcut byte set to "0"). the setup of the highcut characteristics is described in 4.9. 10.5 pll and pilottone-detector the pll has the task to lock on the 19khz pilottone during a stereo-transmission to allow a correct demodula- tion. the included pilottone-detector enables the demodulation if the pilottone reaches the selected pilottone threshold vpthst. two different thresholds are available. the detector output (signal stereo, see blockdi- agram) can be checked by reading the status byte of the a631 via i 2 c-bus. during a softmute the pll can be set into "hold"-mode which freezes the pll's state (bit d4, softmute byte). after releasing the softmute the pll will again follow the input signal only by correcting the phase error. 10.6 fieldstrength control the fieldstrength input is used to control the highcut- and the stereoblend-function. in addition the signal can be also used to control the noiseblanker thresholds and as input for the multipath detector. these additional func- tions are described in sections 3.3 and 4. 10.7 level-input and -gain to suppress undesired high frequency modulation on the highcut- and stereoblend-control signal the level signal is lowpass filtered firstly. the filter is a combination of a 1.st-order rc-lowpass at 53khz (working as anti- aliasing filter) and a 1.st-order switched-capacitor-lowpass at 2.2khz. the second stage is a programmable gain stage to adapt the level signal internally to different if-devices (see testmode section 5: levelhcc). the gain is widely programmable in 16 steps from 0db to 6db (step=0.4db). these 4 bits are located together with the roll-off bits in the "stereodecoder-adjustment"-byte to simplify a possible adjustment during the production of the carradio. this signal controls directly the highcut stage whereas the signal is filtered again (fc=100hz) before the stereoblend stage (see figure 25).
33/57 tda7405 10.8 stereoblend control the stereoblend control block converts the internal level-voltage (levelsb) into an demodulator compatible analog signal which is used to control the channel separation between 0db and the maximum separation. inter- nally this control range has a fixed upper limit which is the internal reference voltage ref5v. the lower limit can be programmed between 20 and 70% of ref5v in 3.3% steps (see figure 31, figure 29). to adjust the external level-voltage to the internal range two values must be defined: the level gain lg and vsbl (see figure 32). at the point of full channel separation the external level signal has to be amplified that internally it becomes equal to ref5v. the second point (e.g. 10db channel sep.) is then adjusted with the vsbl voltage. figure 32. internal stereoblend characteristics the gain can be programmed through 4 bits in the "stereodecoder-adjustment"-byte. all necessary internal ref- erence voltages like ref5v are derived from a bandgap circuit. therefore they have a temperature coefficient near zero. figure 33. relation between internal and external level-voltages for setup of stereoblend 10.9 highcut control the highcut control setup is similar to the stereoblend control setup : the starting point vhch can be set with 2 bits to be 42, 50, 58 or 66% of ref5v whereas the range can be set to be 17, 22, 28 or 33% of vhch (see figure 30). 70 20
tda7405 34/57 figure 34. highcut characteristics 11 functional description of the noiseblanker in the automotive environment the mpx-signal as well as the am-signal is disturbed by spikes produced by the ignition and other radiating sources like the wiper-motor. the aim of the noiseblanker part is to cancel the audi- ble influence of the spikes. therefore the output of the stereodecoder is held at the actual voltage for a time between 22 and 38s in fm (370 and 645s in am-mode). the blockdiagram of the noiseblanker is given in figure 34. figure 35. block diagram of the noiseblanker 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 triggerstage a pulse former generates the "blanking"-pulse. 11.1 trigger path fm the incoming mpx signal is highpass-filtered, amplified and rectified. this second order highpass-filter has a corner-frequency of 140khz. the rectified signal, rect, is integrated (lowpass filtered) to generate a signal called peak. the dc-charge/discharge behaviour can be adjusted as well as the transient behaviour(mp-dis- charge control). also noise with a frequency 140khz increases the peak voltage. the peak voltage is fed to a threshold generator, which adds to the peak-voltage a dc-dependent threshold vth. both signals, rect and peak+vth are fed to a comparator which triggers a re-triggerable monoflop. the monoflop's output acti- vates the sample-and-hold circuits in the signalpath for the selected duration 11.2 noise controlled threshold adjustment (nct) there are mainly two independent possibilities for programming the trigger threshold: 1. the low threshold in 8 steps (bits d 1 to d 3 of the noiseblanker-byte i) 2. and the noise adjusted threshold in 4 steps (bits d 4 and d 5 of the noiseblanker-byte i, see figure 22).
35/57 tda7405 the low threshold is active in combination with a good mpx signal without noise; the peak voltage is less than 1v. the sensitivity in this operation is high. if the mpx signal is noisy (low fieldstrength) the peak voltage in- creases due to the higher noise, which is also rectified. with increasing of the peak voltage the trigger threshold increases, too. this gain is programmable in 4 steps (see figure 25). 11.3 additional threshold control mechanism 11.3.1automatic threshold control by the stereoblend voltage besides the noise controlled threshold adjustment there is an additional possibility for influencing the trigger threshold which depends on the stereoblend control. the point where the mpx signal starts to become noisy is fixed by the rf part. therefore also the starting point of the normal noise-controlled trigger adjustment is fixed (figure 27). in some cases the behavior of the noise- blanker can be improved by increasing the threshold even in a region of higher fieldstrength. sometimes a wrong triggering occurs for the mpx signal often shows distortion in this range which can be avoided even if using a low threshold. because of the overlap of this range and the range of the stereo/mono transition it can be controlled by stereoblend. this increase of the threshold is programmable in 3 steps or switched off. 11.3.2over deviation detector if the system is tuned to stations with a high deviation the noiseblanker can trigger on the higher frequencies of the modulation or distortion. to avoid this behavior, which causes audible noise in the output signal, the noiseblanker offers a deviation-dependent threshold adjustment. by rectifying the mpx signal a further signal representing the actual deviation is obtained. it is used to increase the peak voltage. offset and gain of this circuit are programmable in 3 steps with the bits d 6 and d 7 of the noiseblanker-byte i (bit combination '00' turns off the detector, see figure 26). 11.3.3multipath-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 voltage-level at pin mpout. the a631 offers a linear as well as a threshold driv- en control. the linear influence of the multipath-level on the peak-signal (d 7 of multipath-control-byte) gives a discharge slewrate of 1v/ms 1 . the second possibility is to activate the threshold driven discharge which switches on the 18kohm discharge if the multipath-level is below 2.5v (d 7 of noiseblanker-byte ii-byte). 1 the slewrate is measured with r discharge = nfinite and v mpout = 2.5v 11.3.4am mode of the noiseblanker the a631 noiseblanker is also suitable for am noise canceling. the detector uses in am mode the 450khz un- filtered if-output of the tuner for spike detection. a combination of programmable gain-stage and lowpass-filter forms an envelope detector which drives the noiseblanker's input via a 120 khz 1.st order highpass. in order to blank the whole spike in am mode the hold-times of the sample and hold circuit are much longer then in fm (640s to 1.2ms). all threshold controls can be used like in fm mode. 11.4 functional description of the multipath-detector using the multipath-detector the audible effects of a multipath condition can be minimized. a multipath-condi- tion is detected by rectifying the spectrum around 19khz in the fieldstrength signal. an external capacitor is used to define the attack- and decay-times for the stereoblend (see blockdiagram, figure 35). due to the very small charge currents this capacitor should be a low leakage current type (e.g. ceramic). using this configuration an adaptation to the user's requirement is possible without effecting the "normal" fieldstrength input (level) for the stereodecoder. this application is given in figure 35. another (internal) time constant is used to control the highcut through the multipath detector selecting the "internal influence" in the configuration byte the stereo-blend and/or the highcut is automatically invoked during a multipath condition according to the voltage appearing at the mp_out-pin.
tda7405 36/57 figure 36. blockdiagram of the multipath-detector 11.5 quality detector the tda7405 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 follow- ing formula : v qual = 1.6 (v noise -0.8 v)+ a (ref5v-v mpout ). the noise-signal is the peak-signal without additional influences (see noiseblanker description). the factor 'a' can by programmed to 0.7 .... 1.15. t he output is a low impedance output able to drive external circuitry as well as simply fed to an ad-converter for rds applications.
37/57 tda7405 11.6 dual-mpx mode the tda7405 is able to support a twin tuner concept via the dual-mpx-mode. in this configuration the mpx-pin and the md2g-pin are acting as mpx1 and mpx2 inputs. the dc-voltage at the md2-pin controls whether one or both mpx-signals are used to decode the stereo fm-signal. it is designed as a window-comparator with the characteristic shown in figure 36 (please note that the thresholds have a hysteresis of 500mv). in this mode the stereodecoder highohmic-mute mutes both inputs in parallel. figure 37. blockdiagram dual mpx table 10. pin-configuration dmpx-/wsm-mode 11.7 weak-signal mute for use with front-ends which do not support a weak-signal-mute function the tda7405 offers this feature as well. if this mode is enabled the pins 29 and 30 are used as an ac-coupling behind the mute-stage (see block- diagram). in parallel pin 12 (amif) is switched internally to realize a mute time-constant with fast attack- and slow decay-time. dual mpx weak-signal mute amif(12) dmpxc(25) mpx2(26) md2(43) md2g(44) off off amif-in not used not used md2-in md2-gnd off on wsm-tc wsm-in wsm-out md2-in md2-gnd on off amif-in dmpc-cntrl mpx2 md2-in md2-gnd on on wsm-tc wsm-in wsm-out dmpc-cntrl mpx2
tda7405 38/57 figure 38. weak-signal mute-depth @ 0.5v threshold figure 39. weak-signal mute-threshold @ 24db mute-depth 11.8 stereodecoder testmode during the testmode, which can be activated by setting bit d0 and bit d1 of the stereodecoder testing-byte, several internal signals are available at the fd2r+ pin. during this mode the input resistance of 100kohm is disconnected from the pin. the internal signals available are shown in the data-byte specification. 0.0 0 .8 0.1 0.7 0.2 0.6 0.3 0.5 0.4 -40 5 -35 0 -30 -5 -25 -10 -20 -15 level voltage / v m u t e d e p t h / d b 0.0 0.8 0.1 0.7 0.2 0.6 0.3 0.5 0.4 -30 5 -25 0 -20 -5 -15 -10 level voltage / v m u t e d e p t h / d b
39/57 tda7405 12 i2c bus interface 12.1 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) s = start r/w ="0" -> receive-mode (chip could be programmed by p) "1" -> transmission-mode (data could be received by p) ack = acknowledge p = stop max clock speed 500kbits/s 12.1.1auto increment if bit i in the subaddress byte is set to "1", the autoincrement of the subaddress is enabled. 12.1.2transmitted data (send mode) sm = soft mute activated st = stereo p = pause x = not used the transmitted data is automatically updated after each ack. transmission can be repeated without new chi- paddress. 12.1.3reset condition a power-on-reset is invoked if the supply-voltage is below than 3.5v. after that the following data is written automatically into the registers of all subaddresses : 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 msb lsb msb lsb msb lsb s1000110r/wackcazi aaaaaack data ack p msb lsb xxxx x p st sm msb lsb 1111 1 1 1 0
tda7405 40/57 12.2 subaddress (receive mode) msb lsb function i 2 i 1 i 0 a 4 a 3 a 2 a 1 a 0 0 1 compander hold off on 0 1 autozero remain off on 0 1 auto-increment mode off on 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 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 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 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 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 subaddress main source selector loudness volume treble bass mixing programming softmute voice-band second source selector equalizer frequencies equalizer-config. / bass compander configuration audioprocessor i configuration audioprocessor ii equalizer low-filter equalizer high-filter speaker attenuator lf speaker attenuator rf speaker attenuator lr speaker attenuator rr mixing level control testing audioprocessor stereodecoder noise-blanker i noise-blanker ii am / am-noiseblanker high-cut control fieldstr. & quality multipath-detector stereodecoder adjustment configuration stereodecoder testing sterodecoder
41/57 tda7405 12.3 data byte specification the status after power-on-reset is marked bold-face / underlined in the programming tables. table 11. main selector (0) table 12. loudness (1) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 fd1 / se2 se3 fd2 se1 md2 md1 / se4 stereodecoder am 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 input gain 0db 1db : 14db 15db 0 1 mute off on msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 : 0 0 : 1 : 0 0 : 1 1 : 0 : 0 0 : 1 1 : 0 : 0 0 : 1 1 : 1 : 0 1 : 0 1 : 1 : attenuation 0 db -1 db : -14 db -15 db : -19 db not allowed 0 0 1 1 0 1 0 1 center frequency 200hz 400hz 600hz 800hz 0 1 loudness order first order second order
tda7405 42/57 table 13. volume 1) (2) note: 1. it is not recommended to use a gain more than 20db for system performance reason. in general, the max. gain should be li mited by software to the maximum value, which is needed for the system. table 14. treble filter (3) msb lsb at tenu ati on d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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) (+31.5db) : +20.0db +19.5db +19.0db : +0.5db 0.0db -0.5db : -79.0db -79.5db msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 1 : 0 1 1 0 : 1 0 treble steps -15db -14db : -1db 0db 0db +1db : +14db +15db 0 0 1 1 0 1 0 1 treble center-frequency 10.0 khz 12.5 khz 15.0 khz 17.5 khz 0 1 bass dc-mode on off
43/57 tda7405 table 15. bass filter (4) table 16. mixing programming (5) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 bass steps -15.5db -15.0db : -0.5 db 0db 0db +0.5 db : +15.0 db +15.5 db 0 0 1 1 0 1 0 1 bass q-factor 1.0 1.25 1.5 2.0 msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 mixing mute enable 0 0 1 1 0 1 0 1 mixing source beep md1 md2 fm mono 0 1 0 1 0 1 0 1 mixing target speaker lf off speaker lf on speaker rf off speaker rf on speaker lr off speaker lr on speaker rr off speaker rr on 0 1 loudness main/2nd 2nd main
tda7405 44/57 table 17. softmute (6) table 18. voiceband (7) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 softmute on (mute) off 0 0 1 1 0 1 0 1 mutetime 0.48 ms 0.96 ms 123 ms 324 ms 0 1 influence on stereodecoder highohmic-mute on off 0 1 influence on pilot-detector hold and mp-hold on off 0 1 influence on softmute on off 0 0 1 1 0 1 0 1 beep frequencies 500 hz 780 hz 1.8 khz 19 khz msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 voice-band low-pass enable filter off filter on 0 1 voice-band low-pass frequency 3 khz 6 khz 0 1 voice-band high-pass enable filter off filter on 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 high-pass cut-off-frequency 90hz 135hz 180hz 215hz 300hz 450hz 600hz 750hz 0 1 anti-clipping enable on off 0 1 anti-clipping input mp-in am
45/57 tda7405 table 19. second source selector (8) table 20. equalizer (9) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 fd1 / se2 se3 fd2 se1 md2 md1 / se4 stereodecoder am 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 input gain 0db 1db : 14db 15db 0 1 mute off on msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 frequencies eq low-filter 63 hz 74 hz 88 hz 105 hz 125 hz 149 hz 177hz 210 hz 250 hz 297 hz 353 hz 421 hz 500 hz 595 hz 707 hz 841 hz 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 frequencies eq high-filter 297 hz 353 hz 421 hz 500 hz 595 hz 707 hz 841 hz 1.0 khz 1.19 khz 1.41 khz 1.68 khz 2.0 khz 2.38 khz 2.83 khz 3.36 khz 4.0 khz
tda7405 46/57 table 21. eq-configuration / bass (10) table 22. compander (11) note: 1. the softstep-times are only programmable while the compander is not used. msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 1 1 0 1 0 1 eq filter rear path no filter high-filter low-filter high+low-filter 0 0 1 1 0 1 0 1 eq filter front path no filter high-filter low-filter high+low-filter 0 1 am noisebl. softunmute on off 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 bass center-frequency 60hz 80hz 70hz 90hz 100hz 130hz 150hz 200hz msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 1 1 0 1 0 1 activity / reference level off 0.5v rms 1v rms 2v rms 0 0 1 1 0 1 0 1 attack-times 6ms 12ms 24ms 49ms 0 0 1 1 0 1 0 1 release-times 390ms 780ms 1.17s 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) 160s 320s 640s 1.28ms 2.56ms 5.12ms 10.2ms 20.4ms 0 1 compander max. gain 29db 19db
47/57 tda7405 table 23. configuration audioprocessor i (12) table 24. configuration audioprocessor ii (13) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 compander source main selector second source selector 0 1 softstep off on 0 1 main loudness flat filter on 0 1 second loudness flat filter on 0 0 1 1 0 1 0 1 front speaker mute second source internal coupled main source ac-coupled main source internal coupled 0 0 1 1 0 1 0 1 rear speaker mute second source internal coupled main source ac-coupled main source internal coupled msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 pause detector off on 0 0 1 1 0 1 0 1 pause zc window 160mv 80mv 40mv not allowed 0 1 fd1 mode single ended differential 0 0 1 1 0 1 0 1 fd1 attenuation -12db -6db -6db 0db 0 1 fd2 attenuation -6db 0db 0 1 md1 mode single ended differential
tda7405 48/57 table 25. equalizer low-filter (14) table 26. equalizer high-filter (15) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 1 : 0 1 1 0 : 1 0 gain / attenuation -15db -14db : -1db 0db 0db +1db : +14db +15db 0 0 1 1 0 1 0 1 equalizer q 1 2 3 4 0 1 pause-detector source rear input-selector front input-selector msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 1 : 0 1 1 0 : 1 0 gain / attenuation -15db -14db : -1db 0db 0db +1db : +14db +15db 0 0 1 1 0 1 0 1 equalizer q 1 2 3 4 0 1 switch qual.-detector noise content off on
49/57 tda7405 table 27. speaker, subwoofer and mixer level-control (16-20) the programming of all speaker-, subwoofer and mixing level-controls are the same. table 28. testing audioprocessor (21) note : this byte is used for testing or evaluation purposes only and must not set to other values than " 11101110 " in the application! msb lsb at tenu ati on d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 1 : 1 1 0 0 : 0 0 : 0 0 x 0 : 0 0 0 0 : 0 0 : 1 1 1 0 : 0 0 0 0 : 0 0 : 0 0 1 0 : 0 0 0 0 : 0 1 : 0 0 x 1 : 0 0 0 0 : 1 0 : 1 1 x 1 : 0 0 0 0 : 1 0 : 1 1 x 1 : 0 0 0 0 : 1 0 : 1 1 x 1 : 1 0 0 1 : 1 0 : 0 1 x +15 db : +1 db 0 db 0 db -1 db : -15 db -16 db : -78 db -79 db mute msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 audioprocessor testmode 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 200khz oscillator not allowed am nb mute nb-hold internal reference 0 1 compander testmode off on 0 1 clock external internal 0 1 az function off on 0 1 sc-clock fast mode normal mode
tda7405 50/57 table 29. stereodecoder (22) note: 1. if deemphasis-shift enabled (subaddr.26/bit7 = 0) table 30. noiseblanker i (23) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 std unmuted std muted 0 0 1 1 0 1 0 1 in-gain 11db in-gain 8.5db in-gain 6db in-gain 3.5db 0 1 input am-pin input mpx-pin 0 1 forced mono mono/stereo switch automatically 0 1 pilot threshold high pilot threshold low 0 0 1 1 0 1 0 1 deemphasis 50s (37.5s 1 ) deemphasis 62.5s (46.9s 1 ) deemphasis 75s (56.3s 1 ) deemphasis 100s (75s 1 ) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 noiseblanker off noiseblanker 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 low threshold 65mv low threshold 60mv low threshold 55mv low threshold 50mv low threshold 45mv low threshold 40mv low threshold 35mv low threshold 30mv 0 0 1 1 0 1 0 1 noise controlled threshold 320mv noise controlled threshold 260mv noise controlled threshold 200mv noise controlled threshold 140mv 0 0 1 1 0 1 0 1 overdeviation adjust 2.8v overdeviation adjust 2.0v overdeviation adjust 1.2v overdeviation detector off
51/57 tda7405 table 31. noiseblanker ii (24) table 32. am / fm-noiseblanker (25) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 peak charge current low high 0 0 1 1 0 1 0 1 fieldstrength adjust 2.3v 1.8v 1.3v off 0 0 1 1 0 1 0 1 blank time fm / am 38s / 1.2ms 25.5s / 800s 32s / 1.0s 22s / 640s 0 0 1 1 0 1 0 1 noise rectifier discharge resistor r = infinite r dc = 56k r dc = 33k r dc = 18k 0 1 strong multipath influence on peak 18k off on (18k discharge if v mpout < 2.5v) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 stereodecoder mode fm am 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 am rectifier gain 6db 8db 10db 12db 14db 16db 18db 20db 0 0 1 1 0 1 0 1 rectifier cut-off frequency 14.0khz 18.5khz 28.0khz 56.0khz 0 1 overdeviation time constant on off 0 1 am blank-mode high-ohmic mute sample&hold
tda7405 52/57 table 33. high-cut (26) table 34. fieldstrength control (27) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 high-cut off on 0 0 1 1 0 1 0 1 max. high-cut 2db 5db 7db 10db 0 0 1 1 0 1 0 1 vhch to be at 42% ref5v 50% ref5v 58% ref5v 66% ref5v 0 0 1 1 0 1 0 1 vhcl to be at 16.7% vhch 22.2% vhch 27.8% vhch 33.3% vhch 0 1 deemphasis shift on off msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 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 vsbl to be at 20.0% ref5v 23.3% ref5v 26.6% ref5v 30.0% ref5v 33.3% ref5v 36.6% ref5v 40.0% ref5v 43.3% ref5v 46.6% ref5v 50.0% ref5v 53.3% ref5v 56.6% ref5v 60.0% ref5v 63.3% ref5v 66.6% ref5v 70.0% ref5v 0 0 1 1 0 1 0 1 quality detector coefficient a=0.7 a=0.85 a=1.0 a=1.15 0 0 1 1 0 1 0 1 hcc-level-shift (only level through mpd) 0.0v 500mv 1.0 v 1.5 v
53/57 tda7405 table 35. multipath detector (28) table 36. stereodecoder adjustment (29) msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 fast load on off 0 0 1 1 0 1 0 1 bandpass gain 6db 12db 16db 18db 0 0 1 1 0 1 0 1 rectifier gain gain = 7.6db gain = 4.6db gain = 0db disabled 0 1 charge current at mp-out 0.25a 0.50a 0 1 multipath on high-cut decay-time 2ms 10ms 0 1 multipath influence on peak discharge off -1v/ms msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 0 0 : 0 : 0 1 1 1 : 1 : 1 0 0 0 : 1 : 1 0 0 0 : 1 : 1 0 0 1 : 0 : 1 0 0 1 : 0 : 1 0 1 0 : 0 : 1 0 1 0 : 0 : 1 roll-off compensation not allowed 7.2% 9.4% : 13.7% : 20.2% not allowed 19.6% 21.5% : 25.3% : 31.0% 0 0 0 : 1 0 0 0 : 1 0 0 1 : 1 0 1 0 : 1 level gain 0db 0.4db 0.8db : 6db
tda7405 54/57 table 37. stereodecoder configuration (30) note: 1. using the multipath time-constants for stereo-bland and high-cut table 38. testing stereodecoder(31) note : this byte is used for testing or evaluation purposes only and must not set to other values than " 11111100 " in the application msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 multipath influence on high-cut on off 0 1 multipath influence on stereo-blend on off 0 1 1 x 1 x level-input over multipath-detector 1 on off 0 1 dual mpx mode on off 0 1 weak-signal-mute on off 0 1 wsmute threshold 0.3 v 0.5v 0 0 1 1 0 1 0 1 ws-mute-depth -20 db -24 db -28 db -32 db msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 main testmode off on 0 1 stereodecoder testmode 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 testsignals f228 nb threshold level for stereo-blend pilot magnitude vhccl pilot threshold vhcch ref5v holdn nb peak am-rectifier vcocon; vco control voltage vsbl pilot threshold level for high-cut ref5v 0 1 audioprocessor oscillator off on 0 1 disable noiseblanker @ fs > 2.5v on off
55/57 tda7405 figure 40. tqfp44 (10 x 10) mechanical data & package dimensions outline and mechanical data 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 0.30 0.37 0.45 0.012 0.015 0.018 c 0.09 0.20 0.004 0.008 d 11.80 12.00 12.20 0.464 0.472 0.480 d1 9.80 10.00 10.20 0.386 0.394 0.401 d3 8.00 0.315 e 11.80 12.00 12.20 0.464 0.472 0.480 e1 9.80 10.00 10.20 0.386 0.394 0.401 e3 8.00 0.315 e 0.80 0.031 l 0.45 0.60 0.75 0.018 0.024 0.030 l1 1.00 0.039 k 0?(min.), 3.5?(typ.), 7?(max.) tqfp44 (10 x 10 x 1.4mm) a a2 a1 b seating plane c 11 12 22 23 33 34 44 e1 e d1 d e 1 k b tqfp4410 l 0.10mm .004 0076922 d
tda7405 56/57 table 39. revision history date revision description of changes october 2001 1 first issue may 2004 2 modified electrical characteristics and stylesheet
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