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1/49 TDA7406T april 2001 audio processor: n 4 stereo inputs n 4 mono inputs n volume control n 7 band equalizer filter control n high pass filter for subwoofer application n direct mute and soft mute n internal beep generation n 4 independent speaker outputs n soft step speaker control n subwoofer output n 7 band spectrum analyzer n full mixing capability n pause detector stereo decoder: n rds mute n no external adjustments n am/fm noiseblanker with several trigger controls n programmable multipath detector n quality detector output digital control: n i 2 c-bus interface description the device includes a high performance audio pro- cessor with 7 bands equalizer and spectrum analyzer plus a stereo decoder-noiseblanker. the whole low frequency signal processing necessary for state-of- the-art as well as future car radios is therefore provid- ed. the digital control allows a full programming not only of the audioprocessor and filter characteristics but also in the stereodecoder part especially for the adaptation to different if-devices. tqfp44 ordering number: TDA7406T car radio signal processor pin connection (top view)
TDA7406T 2/49 supply thermal data absolute maximum ratings esd: all pins are protected against esd according to the mil883 standard. symbol parameter test conditions min. typ. max. unit v s supply voltage 7.5 9 10 v i s supply current v s = 9v 42 60 78 ma svrr ripple rejection @ 1khz audioprocessor (all filters flat) 60 db stereodecoder + audioprocessor 55 db symbol description 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 1 v t amb operating temperature range -40 to 85 c t stg storage temperature range -55 to +150 c
3/49 TDA7406T block diagram supply cref out lf mixinlf mixinlr mixinrf mixinrr acinr acinl swin acoutr acoutl swacout d01au1255 i 2 c bus beep pause v s mdr input multiplexer am/mpx2 mpin mpout mpx1 cmpx am if loudness spectrum analyser soft mute softstep volume high pass 7 band equalizer acin subwooferout output selector out rf out sw sda scl qua digital control cdr mdl tapel gnd sm saout main source selector l l r l r r l r mixing selector cdl cd md tape cdc taper pdl+ pd- pdr+ phone tim navi phone tim navi am fm dcin front rear soft step fader soft step fader mixer in-gain + auto zero subwoofer filter std ingain pilot- cancellation multipath detector am/fm noise blanker demodulator + stereo adjust + stereo bled + + 80khz-lp pll pildet 25khz-lp out rf out rr soft step fader soft step fader soft step fader mono fader s & h qual pulse former high cut d a saclk pause level
TDA7406T 4/49 1 audioprocessor part features: n input multiplexer C pseudo differential cdc stereo input, programmable as single-ended input. C 3 single-ended stereo inputs. C 4single-ended mono inputs. C input gain adjust 0...15db in 1db steps. C internal offset-cancellation (autozero). n beep C internal beep generator with 4 different frequencies. n mixing stage C beep, phone- and navi-input mixable to all speaker outputs. C tim or tuner (fm/am) programmable as fourth mixing source. C level control range of 95db (+15...-79db). n loudness C loudness programmable center frequency and filter slope. C 0...19db attenuation in 1db steps. C selectable flat-mode (constant attenuation). n volume C gain/attenuation with 0.5db step resolution. C soft-step control with programmable blend times. C 110db range (+32...-79db). n equalizer C seven bands equalizer with 2 nd order frequency response switch-capacitors filters. C center frequency programmable for lowest and highest filter. C programmable quality factor in four steps for each filter. C 15db range with 1db steps. n spectrum analyzer C seven bandpass 2 nd order frequency response switch-capacitors filters C programmable quality factor for different visual appearance C analog output C controlled by external serial clock n high pass filter C 2nd order butterworth high pass with programmable cut-off frequency C selectable flat-mode n speakers C 4 independent speaker controls with separate mute. C control range 95db (+15...-79db) in 1db steps with soft step. C 4 independent programmable mix inputs with 50% mixing ratio n subwoofer C single-ended monaural output C control range 95db (+15...-79db) in 1db steps with soft step. C separate mute n mute functions C direct mute C digitally controlled soft mute with 4 programmable mute-time
5/49 TDA7406T table 1. 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 single ended inputs 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 steps -5 1 5 mv g min to g max -10 61 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 w 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 11 v beep control v rms beep level mix-gain = 6db 250 350 500 mv f beep beep frequency f beep1 475 500 525 hz f beep2 740 780 820 hz f beep3 1.48 1.56 1.64 khz f beep4 2.28 2.4 2.52 khz 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 attenuation step 0.5 1 1.5 db 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
TDA7406T 6/49 a max max. attenuation -83 -79 -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 1) 1v v th high high threshold for sm - pin 2.5 v r pu internal pull-up resistor 32 45 58 k w v pu internal pull-up voltage 3.3 v equalizer control c range control range + 14 + 15 + 16 db a step step resolution 0.5 1 1.5 db f c1 center frequency band 1 f c1a 55 62 69 hz f c1b 90 100 110 hz f c2 center frequency band 2 f c2 141 157 173 hz f c3 center frequency band 3 f c3 365 396 437 hz f c4 center frequency band 4 f c4 0.9 1 1.1 khz f c5 center frequency band 5 f c5 2.25 2.51 2.766 khz f c6 center frequency band 6 f c6a 3.6 4 4.4 khz f c6b 5.70 6.34 6.98 khz f c7 center frequency band 7 f c7a 13.5 15 16.5 khz f c7b 14.4 16 17.6 khz q quality factor q 1 0.9 1 1.1 q 2 1.26 1.4 1.54 q 3 1.62 1.8 1.98 q 4 1.98 2.2 2.44 table 1. electrical characteristics (continued) (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 1) the sm-pin is active low (mute = 0)
7/49 TDA7406T dc gain dc-gain, band 1 dc = off -1 0 +1 db dc = on, 15db boost 4 db spectrum analyzer control v saout output voltage range 0 3.3 v f c1 center frequency band 1 f c1 55 62 69 hz f c2 center frequency band 2 f c2 141 157 173 hz f c3 center frequency band 3 f c3 356 396 436 hz f c4 center frequency band 4 f c4 0.9 1 1.1 khz f c5 center frequency band 5 f c5 2.26 2.51 2.76 khz f c6 center frequency band 6 f c6 5.70 6.34 6.98 khz f c7 center frequency band 7 f c7 14.4 16 17.6 khz q quality factor q 1 1.62 1.8 1.98 q 2 3.15 3.5 3.85 f saclk clock frequency 1 100 khz t sadel analog output delay time 2 s t repeat spectrum analyzer repeat time 50 ms t intres internal reset time 3 ms pause detector 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 v speaker attenuators r in input impedance 35 50 65 k w g max max. gain 14.5 15.5 16.5 db a max max. attenuation -83.5 -79.5 -75 db a step step resolution 0.5 1 1.5 db a mute output mute attenuation 80 90 db e e attenuation set error 3db v dc dc steps adjacent attenuation steps 0.5 5 mv m r mixing ratio signal/mix in 50/50 % audio outputs v clip clipping level thd=0.3% 2.2 2.6 v rms r l output load resistance 2 k w table 1. electrical characteristics (continued) (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
TDA7406T 8/49 c l output load capacitance 10 nf r out output impedance 30 120 w v dc dc voltage level 4.3 4.5 4.7 v high pass f hp highpass corner frequency f hp1 81 90 99 hz f hp2 122 135 148 hz f hp3 162 180 198 hz f hp4 194 215 236 hz subwoofer attenuator r in input impedance 35 50 65 k w g max max. gain 14 15 16 db a at tn max. attenuation -83 -79 -75 db a step step resolution 0 1 1.5 db a mute output mute attenuation 80 90 db e e attenuation set error 2db v dc dc steps adjacent attenuation steps 1 5 mv subwoofer lowpass f lp lowpass corner frequency f lp1 72 80 88 hz f lp2 108 120 132 hz f lp3 144 160 176 hz 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 v s/n signal to noise ratio all gains = 0db flat; v o = 2v rms 103 db all eq-bands at +12db; q = 1.0 a-weighted; v o = 2.6v rms 87 db d distortion v in = 1v rms ; all stages 0db 0.01 0.1 % v out = 1v rms ; bass & treble = 12db 0.05 0.1 % s c channel separation left/right 80 90 db table 1. electrical characteristics (continued) (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
9/49 TDA7406T 2 description of the audioprocessor part 2.1 input stages in the basic configuration there is a source-selector with 8 inputs: one pseudo-differential (cdc), three single ended stereo (md, cd, tape), three single-ended mono (phone, navi, tim) plus the tuner input. the tuner input takes the signal from either mpx1 or mpx2/am pins (through the stereodecoder) see fig. 1. 2.1.1 pseudo-differential stereo input (pd) the pd input is implemented as a buffered pseudo-differential stereo stage with 100k w input-impedance at each input pin. this input is also configurable as single-ended stereo input (cdc, see pin-out). the common input-pin, pd- features a fast charge switch to speed up the charge time of external capacitors. this switch is released the first time the input-selector data-byte (0) is assessed. 2.1.2 single-ended stereo inputs, single-ended mono inputs and fm-mpx input all single ended inputs have an input impedance of 100k w . the am-pin can be connected to the input of the stereo-decoder in order to use the am-noiseblanker and am-high-cut feature. as input tuner for the input se- lector either the stereo-decoder output or the am-pin is selectable. 2.1.3 mixing selector it is possible to enable/disable the mixing feature (ratio 50%) at the outputs stages between whichever input source and one of the following signals: beep, phone, navigator and tuner/tim. 2.1.4 beep generator there are four possible selectable beeping frequencies: 600hz, 780hz, 1.56khz and 2.4khz. figure 1. input-stages
TDA7406T 10/49 2.2 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 have to be muted by soft mute or hard mute during this time. 2.2.1 autozero for stereodecoder-selection a special procedure is recommended for selecting the stereodecoder at the input-selector to guarantee an op- timum offset-cancellation: (step 0: softmute or mute the signal-path) step 1: temporary deselect the stereodecoder at the input-selector step 2: configure the stereodecoder via iic-bus step 3: wait 1ms step 4: select the stereodecoder 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. 2.2.2 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 TDA7406T could be switched in the autozero-remain-mode (bit 6 of the subaddress-byte). if this bit is set to high, the databyte 0 could be loaded without invoking the autozero and the old adjustment-value remains. 2.2.3 pause detector a pause detector stage with programmable threshold (40/80/160mv) is provided (see data byte 14). the pause detector info is available at the pause pin; a capacitor must be connected between this pin and gnd. when the incoming signal is detected to be outside the selected window, the external capacitor is discharged. when the signal is inside the window, the capacitor is integrating up. the pause status can be detected in two ways: a) reading directly the pause pin level pause off = level low (<3.0v) pause on = level high (>3.0v) b) by reading the i2c transmitted byte, bit p p = 1 pause active p = 0 no pause detected the external capacitor value fixes the time constant. the pull up current is 25 m a typical.
11/49 TDA7406T 2.3 loudness there are four parameters programmable in the loudness stage: n attenuation: 0 to -19db attenuation in 1db steps vs. frequency (see the response at f p = 400hz in figure 2). n peak frequency: four programmable peak frequencies: 200,400,600 and 800hz (see figure 3). n filter order: first or second order frequency response (see figure 4). n flat mode: selectable flat-mode. in flat mode the loudness stage works as a 0db to -19db attenuator. figure 2. loudness attenuation @ f p = 400hz. figure 3. loudness center frequencies @ attn. = 15db db hz -25.0 -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k db hz -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k
TDA7406T 12/49 figure 4. 1st and 2nd order loudness @ attn. = 15db, fp=400hz 2.4 soft mute the digitally controlled soft mute stage allows signal muting/demutingwith a programmable slope. the mute time is selectable among 4 values: 0.48, 0.96, 123 and 324ms. the mute process can either be activated by the soft mute pin or via the i 2 c-bus. this slope is realized in a special s-shaped curve to mute slow in the critical regions (see figure 5). for timing purposes the i 2 c-bus output register (bit0 = sm read bit) is set to 1 from the start of muting until the end of de-muting. figure 5. soft mute-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. db hz -20.0 -15.0 -10.0 -5.0 0.0 10.0 100.0 1.0k 10.0k
13/49 TDA7406T 2.5 volume control 2.5.1 gain/attenuation control the volume control can range from a gain of 32db up to an attenuation of 79db; however it is not recommended to use a gain higher than 20db for performance reasons. 2.5.2 soft step volume when the speaker-level is changed, audible clicks could appear at the output. the root cause of those clicks could either be a dc offset before the speaker-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 with four different values: 320 m s, 1.28ms, 5.12ms and 20.4ms. figure 6. softstep-timing for volume note: for steps more than 0.5db (volume) or 1db (speaker) the softstep mode should be deactivated because it could generate a h ard 1db step during blending. 2.6 the seven band equalizer 2.6.1 equalizer filter each filter is realized as a switched capacitor with a 2nd order frequency response. there are three parameters programmable in the equalizer filter: n attenuation: 15db in 1db step resolution (figure 7 shows the boost and cut response as a function of frequency at a center frequency of 1khz.) n center frequency: this parameter is programmable in the filter stages 1(62/100hz), 6(4/6.34khz) and 7(15/16khz). the others bands are fixed at: 157, 396, 1k and 2.5k hertz (see figure 8). n quality factors: the four possible quality factors are 1, 1.4, 1.8 and 2.2 (see figure 9). the center frequency, q, dc-mode and boost/cut can be set fully independently for each filter. figure 10 shows the superposition of all equalizer filter curves for different quality factors. 1db 0.5db -0.5db -1db ss time
TDA7406T 14/49 figure 7. equalizer filter control @ f center = 1khz, q = 1.0 figure 8. center frequencies @ gain = 15db, q = 1.0 20 10k 100 1k hz -15 15 -10 10 -5 5 0 db 20k 10 20k 100 1k hz -2 0 16 2 14 4 12 6 10 8 db
15/49 TDA7406T figure 9. quality factors @ boost = 15db, f center = 1khz figure 10. superposition of all eq bands @ boost = 15db 2.6.2 dc-mode the filter stage 1 (62/100hz) has a programmable +4db dc-gain when the boost is set at +15db (see figure 11). 10 20k 100 1k hz -2 0 16 2 14 4 12 6 10 8 db 10 20k 100 1k hz 0 2 18 4 16 6 14 8 12 10 db
TDA7406T 16/49 figure 11. eq band1, normal- and dc-mode @ boost = 15 db, f center = 62 hz note: the center frequency, q, dc-mode and boost/cut can be set fully independently for each filter. 2.7 subwoofer application there is one separate subwoofer output. a low-pass filter stage at this output allows the selection of three dif- ferent frequencies: 80/120/160hz. a high pass filter stage is present in the main path with selectable 90/135/ 180/215hz frequencies. both filters, the low-pass as well as the high-pass filter can be disabled and have but- terworth characteristics so that their cutoff frequencies are not equal but shifted by the factor 1.125 to get a flat frequency response (see figure 12). figure 12. subwoofer application with lowpass @ 80/120/160hz and highpass @ 90/135/180hz 1 10k 10 1k 100 hz -1 16 0 14 2 12 4 10 6 8 db db hz -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 100.0 1.0k 10.0k
17/49 TDA7406T 2.8 spectrum analyzer a fully integrated seven band spectrum analyzer with programmable quality factor is present in the ic (figure 13). the spectrum analyzer consists of seven band pass filters with a rectifier and sample capacitor which stores the maximum peak signal level since the last read cycle. this peak signal level can be read by a microprocessor at the sa out pin. to allow easy interfacing to a microprocessor analog port, the output voltage at this pin is referred to device ground. the microprocessor starts a read cycle when there is a clock edge going negative at the sa clk input. on the following positive clock edges, the peak signal level for the band pass filters is subsequently switched to sa out . each analog output data is valid after the time t sadel . a reset of the sample capacitors is induced whenever sa clk remains high for the time t intres . note that a proper reset requires the clock signal sa clk to be held at high potential. figure 13 shows the block diagram and figure 14 illustrates the read cycle timing of the spectrum analyzer. the spectrum analyzer minimum repeat time is 50ms. 2.8.1 spectrum analyzer filters each filter is realized as a switched capacitor with a 2nd order frequency response. the center frequency of the filter stages are: 62,157, 396, 1k, 2.51k, 6.34k and 16khz. it is possible to choose between two different filter quality factors: 1.8 and 3.5. figure 13. spectrum analyzer block diagram figure 14. timing spectrum analyzer
TDA7406T 18/49 2.9 ac-coupling in some applications additional signal manipulations are desired. for this purpose an ac-coupling is placed be- fore the speaker-attenuators, which can be activated or internally shorted by i2c-bus. in short condition the in- put-signal of the speaker-attenuator is available at the ac-outputs. the input-impedance of this ac-inputs is 50k w . in addition there are mix in inputs available. with this inputs it is possible to mix an external signal to every speaker with a mixing ratio of 50% (see figure 15). the source of front and rear speaker can be set independently. as source is possible to choose: C internal dc coupling (not recommended) C external ac coupling using ac in pins C external ac coupling using mix in pins C mixing of ac in and mix in pins (mixing ratio: 50%) if the mix in pins of the rear speaker are not used this inputs can be used as mixing inputs for the internal sub- woofer filter. figure 15. ac/dc-coupling and mix in inputs 2.10 speaker-attenuator stage each of the four speakers and the subwoofer output has a separate volume control in the range: +15... -79db plus mute with a typical value of -90db. 2.11 output mixer a mixing-stage is placed after each speaker gain/attenuator stage and can be set independently to mixing- mode. having a full volume control for the mix-signal in the range:+15... -79db plus mute with a typical value of -90db, the stage offers a wide flexibility to adapt the mixing levels.
19/49 TDA7406T figure 16. output selector 2.12 audioprocessor testing during the test mode, which can be activated by setting bit i 2 of the subaddress byte and d 0 of the audiopro- cessor testing byte, several internal signals are available at the navi pin. during this mode the input resistance of 100k w is disconnected from the pin. the internal signals available are shown in the data-byte specification.
TDA7406T 20/49 3 stereodecoder part 3.1 features: n no external components necessary n pll with adjustment free, fully integrated vco n automatic pilot dependent mono/stereo switching n very high suppression of intermodulation and interference n programmable roll-off compensation n dedicated rds-softmute n highcut and stereoblend-characteristics programmable in a wide range n fm/am noiseblanker with several threshold controls n multipath-detector with programmable internal/external influence n i 2 c-bus control of all necessary functions table 2. electrical characteristics v s = 9v, de-emphasis 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 w 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 60 db a 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 d f/f capture range 0.5 % deemphasis and highcut sn + n --------------
21/49 TDA7406T t deempf m de-emphasis time constants 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 time constant multiplier fm v level << v hcl 3 t deempa m de-emphasis time constants 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 high cut time constant 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 77 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 a 19 pilot signalf=19khz 40 50 db a 38 subcarrier f=38khz 75 db a 57 subcarrier f=57khz 62 db a 76 subcarrier f=76khz 90 db table 2. electrical characteristics (continued) v s = 9v, de-emphasis 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
TDA7406T 22/49 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 (f s = 67khz, unmodulated). intermodulation (note 1) a 2f mod =10khz, f spur =1khz 65 db a 3f mod =13khz, f spur =1khz 75 db traffic radio (note 2) a 57 signal f=57khz 70 db sca - subsidiary communications authorization (note 3) a 67 signal f=67khz 75 db aci - adjacent channel interference (note 4) a 114 signal f=114khz 95 db a 190 signal f=190khz 84 db table 2. electrical characteristics (continued) v s = 9v, de-emphasis 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 a 2 v o signal () at1khz () v o spurious () at1khz () ---------------------------------------------------------------- ? s ; 210khz () 19khz C == a 3 v o signal () at1khz () v o spurious () at1khz () ---------------------------------------------------------------- ? s ; 313khz () 38khz C == a 57 v.w.f. () v o signal () at1khz () v o spurious () at1khz23khz () ------------------------------------------------------------------------------------ - = a 67 v o signal () at1khz () v o spurious () at9khz () --------------------------------------------------------------- - ? s ; 338khz () 67kh z C ==
23/49 TDA7406T 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). 3.2 dual mpx usage 3.2.1 feature description the TDA7406T is able to support a twin tuner concept via the dual-mpx-mode. the dc-voltage at the cmpx- pin controls whether one or both mpx-signals are used to decode the stereo fm-signal. therefor two window- comparators with a characteristic as shown in figure 17 are implemented (please note that the thresholds have a hysteresis of 500mv). in this mode the stereodecoder high impedance-mute mutes both inputs in parallel. figure 17. block diagram dual mpx a 114 v o signal () at1khz () v o spurious () at4khz () --------------------------------------------------------------- - ? s ; 110kh z 3 38khz () C == a 190 v o signal () at1khz () v o spurious () at4khz () --------------------------------------------------------------- - ? s ; 186kh z 5 38khz () C ==
TDA7406T 24/49 noise blanker part features: n am and fm mode n internal 2nd order 140khz high-pass filter for mpx path n internal rectifier and filters for am-if path n programmable trigger thresholds n trigger threshold dependent on high frequency noise with programmable gain n additional circuits for deviation- and fieldstrength-dependent trigger adjustment n 4 selectable pulse suppression times for each mode n programmable noise rectifier charge/discharge current table 3. electrical characteristics all parameters measured in fm mode if not otherwise specified. symbol parameter test conditions min. typ. max. unit v tr trigger threshold 1) 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 11 140 mv op 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
25/49 TDA7406T notes: 1. 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. 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 adjust- ment 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 k w g amif,min min. gain am if signal am-rectifier in test- mode 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 test- mode 14 khz f amif,max max. f c am if 56 khz table 3. electrical characteristics (continued) all parameters measured in fm mode if not otherwise specified. symbol parameter test conditions min. typ. max. unit time v in t r t high t f v op dc
TDA7406T 26/49 figure 18. trigger threshold vs. v peak figure 19. deviation controlled trigger adjustment figure 20. fieldstrength controlled trigger adjustment 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] 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
27/49 TDA7406T multipath detector features: n internal 19khz band-pass filter n programmable band-pass- and rectifier-gain n selectable internal influence on stereoblend and/or highcut 4 functional description of stereodecoder figure 21. block diagram of the stereodecoder table 4. electrical characteristics symbol parameter test conditions min. typ. max. unit f cmp center frequency of multipath- bandpass stereodecoder locked on pilot tone 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
TDA7406T 28/49 the stereodecoder-part of the TDA7406T (see fig. 25) contains all functions necessary to demodulate the mpx-signal like pilot tone-dependent mono/stereo-switching as well as stereoblend and highcut. adap- tations like programmable input gain, roll-off compensation, selectable de-emphasis time constant and a pro- grammable field strength input allow to use different if-devices. 4.1 stereodecoder-mute the TDA7406T has a fast and easy to control rds-mute function which is a combination of the audioproces- sor's softmute 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 will be set automatically to the high-ohmic mute condition after the audio-signal has been soft muted. 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. fig. 26 shows the output-signal v o as well as the internal 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 22. signals during stereodecoder's softmute figure 23. signal-control via softmute-pin
29/49 TDA7406T 4.2 2.2. ingain + infilter the ingain stage allows to adjust the mpx-signal to an internal magnitude of about 1v rms 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. 4.3 demodulator in the demodulator block the left and the right channel are separated from the mpx-signal. in this stage also the 19-khz pilot tone is cancelled. for reaching a high channel separation the TDA7406T offers an i 2 c-bus pro- grammable roll-off adjustment which is able to compensate the lowpass behavior of the tuner section. if the tun- er's attenuation at 38khz is in a range from 7.2% to 31.0% the TDA7406T needs no external network in front of the mpx-pin. within this range an adjustment to obtain at least 40db channel separation is possible. the bits for this adjustment are located together with the fieldstrength adjustment in one byte. this gives the possibility to perform an optimization step during the production of the car radio where the channel separation and the field- strength control are trimmed. the setup of the stereoblend characteristics which is programmable in a wide range is described in 4.8. 4.4 de-emphasis and highcut the de-emphasis-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 time constant 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. 4.5 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 demodula- tion. 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. the detector output (signal stereo, see block dia- gram) can be checked by reading the status byte of the TDA7406T via i 2 c-bus. during a softmute the pll can be set into hold-mode which freezes the pll's state (bit d 4 , softmute byte). after releasing the softmute the pll will again follow the input signal only by correcting the phase error. 4.6 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 5.3 and 6. 4.7 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 car radio. this signal controls directly the highcut stage whereas the signal is filtered again (fc=100hz) before the stereoblend stage (see fig. 24).
TDA7406T 30/49 4.8 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 figs.24, 25). to adjust the external level-voltage to the internal range two values must be defined: the level gain lg and vsbl (see fig. 25). at the point of full channel separation the external level signal has to be amplified so that internally it becomes equal to ref5v. the second point (e.g. 10db channel sep.) is then adjusted with the vsbl voltage. figure 24. 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 25. relation between internal and external level-voltages for setup of stereoblend 70 20
31/49 TDA7406T 4.9 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 ref5v whereas the range can be set to be 17, 22, 28 or 33% of vhch (see fig. 26). figure 26. highcut characteristics 5 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 block diagram of the noiseblanker is given in fig.27. figure 27. 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 trigger stage a pulse former generates the blanking-pulse. 5.1 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 behavior can be adjusted as well as the transient behavior (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 flip-flop. the flip-flop's output activates the sample-and-hold circuits in the signal path for the selected duration.
TDA7406T 32/49 5.2 noise controlled threshold adjustment (nct) there are mainly two independent possibilities for programming the trigger threshold: 1. the low threshold in 8 steps (bits d1 to d3 of the noiseblanker-byte i) 2. and the noise adjusted threshold in 4 steps (bits d4 and d5 of the noiseblanker-byte i, see fig. 19). 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 increases 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 fig. 22). 5.3 additional threshold control mechanism 5.3.1 automatic 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 (fig. 20). in some cases the behavior of the noiseblank- er 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 con- trolled by stereoblend. this increase of the threshold is programmable in 3 steps or switched off. 5.3.2 over 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 noise- blanker offers a deviation-dependent threshold adjustment. by rectifying the mpx signal a further signal repre- senting 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 d6 and d7 of the noiseblanker-byte i (bit combination '00' turns off the detector, see fig. 19). 5.3.3 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 voltage-level at pin mp out . the TDA7406T offers a linear as well as a threshold driven 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 (d7 of noiseblanker-byte ii-byte). 1 the slewrate is measured with r discharge =infinite and v mpout =2.5v 5.3.4 am mode of the noiseblanker the TDA7406T noiseblanker is also suitable for am noise cancelling. the detector uses in am mode the 450khz unfiltered 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 120khz 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. 6 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 block diagram, fig. 32). 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 fig. 28. another (internal) time constant is used to control the
33/49 TDA7406T 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. figure 28. block diagram of the multipath-detector 7 quality detector the TDA7406T 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 from 0.7 to 1.15. the output is a low impedance output able to drive external circuitry as well as simply fed to an ad-converter for rds applications. 8testmode during the testmode, which can be activated by setting bit i2 of the subaddress byte and bit d1 of the stereo- decoder testing-byte, several internal signals are available at the fd2r+ pin. during this mode the input resis- tance of 100kohm is disconnected from the pin. the internal signals available are shown in the data-byte specification
TDA7406T 34/49 9 i2c bus interface 9.1 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 9.1.1 auto increment if bit i in the subaddress byte is set to 1, the auto increment of the subaddress is enabled. 9.1.2 transmitted 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 chip address. 9.1.3 reset 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/wacktazi aaaaaack data ack p msb lsb xxxx x p st sm msb lsb 1111 1 1 1 0
35/49 TDA7406T 9.2 subaddress (receive mode) 1msb lsb function i 2 i 1 i 0 a 4 a 3 a 2 a 1 a 0 0 1 audioprocessor testmode 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 10 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 source selector loudness volume eq filter 1 (62/100hz) eq filter 2 (157hz) eq filter 3 (396hz) eq filter 4 (1khz) eq filter 5 (2.51khz) eq filter 6 (4/6.34khz) eq filter 7 (15/16khz) mixing programming softmute subwoofer / spectrum analyzer / highpass configuration audioprocessor i configuration audioprocessor ii speaker attenuator lf speaker attenuator rf speaker attenuator lr speaker attenuator rr subwoofer attenuator mixing level control testing audioprocessor stereodecoder noise-blanker i noise-blanker ii am / am-noiseblanker high-cut control fieldstrength & quality multipath-detector stereodecoder adjustment configuration stereodecoder testing sterodecoder
TDA7406T 36/49 9.3 data byte specification the status after power-on-reset is marked bold-face / underlined in the programming tables. table 5. input selector (0) table 6. 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 cdc/pd cd md tape phone navi tuner tim 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
37/49 TDA7406T table 7. volume (2) note: it is not recommended to use a gain more than 20db for system performance reason. in general, the max. gain should be limited by software to the maximum value, which is needed for the system. table 8. equalizer (3,4,5,6,7,8,9) msb lsb attenuation 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 equalizer cut/boost level -15db -14db : -1db 0db 0db +1db : +14db +15db 0 0 1 1 0 1 0 1 equalizer q-factor 2.2 1.8 1.4 1.0 0 1 equalizer center frequency (only subaddresses 3,8,9) 62hz(addr 3)/4khz(addr 8)/15khz(addr 9) 100hz(addr 3)/6.24khz(addr 8)/16khz(addr 9) 0 1 dc mode eq band 1 (62/100 hz, subaddress. 4!) on off
TDA7406T 38/49 table 9. mixing programming (10) table 10. softmute (11) 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 phone navi tuner / tim 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 1 must be 1 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 softmute time mute time = 0.48ms mute time = 0.96ms mute time = 123ms mute time = 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 600 hz 780 hz 1.56 khz 2.4 khz
39/49 TDA7406T table 11. subwoofer configuration / spectrum analyzer / highpass (12) table 12. configuration audioprocessor i (13) 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 subwoofer filter off 80hz 120hz 160hz 0 0 1 1 0 1 0 1 subwoofer coupling ac using sw in pin ac using mix inr pins ac using sw in pin dc 0 1 spectrum analyzer q-factor 3.5 1.8 0 1 high pass enable filter off filter on 0 0 1 1 0 1 0 1 high pass cut-off-frequency 90hz 135hz 180hz 215hz msb lsb function d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 1 cdc input mode single ended pseudo differential 0 1 cdc input gain -6 db 0 db 0 1 softstep volume off on 0 0 1 1 0 1 0 1 softstep time 320s 1.28ms 5.12ms 20.4ms 0 1 loudness flat filter on 0 1 mixing selector tuner/tim switch tim tuner 0 1 tuner selection am stereodecoder
TDA7406T 40/49 table 13. configuration audioprocessor ii (14) table 14. speaker and subwoofer level control (15,16,17,18,19) 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 0 1 1 0 1 0 1 front speaker mixing ac in and mix in ac coupling (mix in ) ac coupling (ac in ) dc coupling 0 0 1 1 0 1 0 1 rear speaker mixing ac in and mix in ac coupling (mix in ) ac coupling (ac in ) dc coupling 1 must be 1 msb lsb attenuation d 7 d 6 d 5 d 4 d 3 d 2 d 1 d 0 0 : 0 0 0 0 : 0 : 0 : 1 : 1 : 1 1 0 : 0 0 0 0 : 1 : 1 : 0 : 0 : 0 1 0 : 0 0 1 1 : 0 : 1 : 0 : 1 : 1 x 1 : 0 0 0 0 : 0 : 0 : 0 : 0 : 1 x 1 : 0 0 0 0 : 0 : 0 : 0 : 0 : 1 x 1 : 0 0 0 0 : 0 : 0 : 0 : 0 : 1 x 1 : 1 0 0 1 : 0 : 0 : 0 : 0 : 1 x gain/attenuation +15db : + 1db 0db 0db - 1db : -16db : -32db : -48db : -64db -79db mute 0 1 softstep on/off on off
41/49 TDA7406T table 15. mixer level control (20) table 16. testing audioprocessor (21) note: this byte is used for testing or evaluation purposes only and must not set to other values than 11111110 in the application! msb lsb attenuation 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 gain/attenuation +15db : + 1db 0db 0db - 1db : -15db -16db : -78db -79db 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 1 0 1 0 1 x 0 1 x x x 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 1 1 1 0 0 0 1 1 0 0 1 1 0 0 1 0 0 1 0 1 test-multiplexer spectrum analyzer filter 62hz spectrum analyzer filter 157hz spectrum analyzer filter 400hz spectrum analyzer filter 1khz spectrum analyzer filter 2.51khz spectrum analyzer filter 6.34khz spectrum analyzer filter 16khz not allowed not used 200khz oscillator nb-hold internal reference 0 1 clock external internal 0 1 az function off on 0 1 sc-clock fast mode normal mode
TDA7406T 42/49 table 17. stereodecoder (22) 1 if de-emphasis-shift enabled (subaddr.26/bit7 = 0) table 18. 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 stereodecoder input am mpx 0 1 forced mono mono/stereo switch automatically 0 1 pilot threshold high pilot threshold low 0 0 1 1 0 1 0 1 de-emphasis 50s (37.5s 1 ) de-emphasis 62.5s (46.9s 1 ) de-emphasis 75s (56.3s 1 ) de-emphasis 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 over deviation adjust 2.8v over deviation adjust 2.0v over deviation adjust 1.2v over deviation detector off
43/49 TDA7406T table 19. noiseblanker ii (24) table 20. 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 11 must be 1
TDA7406T 44/49 table 21. high-cut (26) table 22. 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 de-emphasis 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
45/49 TDA7406T table 23. multipath detector (28) table 24. 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
TDA7406T 46/49 table 25. stereodecoder configuration (30) 1 using the multipath time-constants for stereo-bland and high-cut table 26. testing stereodecoder(31) note: this byte is used for testing or evaluation purposes only and must not be 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 1 1 1 1 must be 1 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 test signals 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 1 must be 1
47/49 TDA7406T figure 29. application diagram
TDA7406T 48/49 tqfp44 (10 x 10) 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 0.014 0.018 c 0.09 0.20 0.004 0.008 d 12.00 0.472 d1 10.00 0.394 d3 8.00 0.315 e 0.80 0.031 e 12.00 0.472 e1 10.00 0.394 e3 8.00 0.315 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.) 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 outline and mechanical data
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