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1/34 TDA7407D april 2005 1 features fully integrated signal processor optimized for car radio applications fully programmable by i 2 c bus includes audioprocessor, stereo - decoder with noise blanker and multipath detector programmable roll-off compensation no external components 2 description the TDA7407D is the newcomer of the csp family introduced by tda7460/61. it uses the same inno- vative concepts and design technologies allowing fully software programmability through i2c bus and overall cost optimisation for the system de- signer. the device includes a three band audioprocessor with configurable inputs and absence of external components for filter settings, a last generation stereodecoder with multipath detector and a so- phisticated stereoblend and noise cancellation cir- cuitry.strength points of the csp approach are flexibility and overall cost/room saving in the appli- cation, combined with high performances. advanced car signal processor figure 2. block diagram rev. 1 fi gure 1. p ac k age table 1. order codes part number package TDA7407D so28 TDA7407Dtr so28 in tape & reel so28 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 2/34 table 2. absolute maximum ratings table 3. supply 3esd all pins are protected against esd according to the mil883 standard. figure 3. pin connection (top view) table 4. thermal data symbol parameter value unit v s operating supply voltage 10.5 v t amb operating ambient temperature range -40 to 85 c t stg operating storage temperature range -55 to 150 c symbol parameter test condition min. typ. max. unit v s supply voltage 7.5 9 10 v i s supply current v s = 9v 30 35 40 ma svrr ripple rejection @ 1khz audioprocessor (all filters flat) 50 60 db stereodecoder + audioprocessor 45 55 db symbol parameter value unit r th-j pins thermal resistance junction to pins max 85 c/w v ref c ref cassl cassr cdr cdl cdgnd ph afs sda gnd v dd out lr out rr out rf out lf acoutr acoutl 1 3 2 4 5 6 7 8 9 26 25 24 23 22 20 21 19 27 10 28 am scl pincon_TDA7407D mpx level mpin mux r qual smute 11 12 13 18 16 17 15 14 mpout mux l obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
3/34 TDA7407D table 5. pin description pin type legenda: i = input o = output i/o = input/output s = supply nc = not connected n. name function type 1 vref reference voltage output i 2 cref reference capacitor pin s 3 tapel tape input left i 4 taper tape input right i 5 cdr cd right channel input i 6 cdgnd cd input common ground i 7 cdl cd input left channel i 8 ph phone input i 9 afs afs drive i 10 am am input i 11 mpx fm stereodecoder input i 12 level level input stereodecoder i 13 mpin multipath input i 14 mpout multipath output o 15 muxl multiplexer output left channel o 16 muxr multiplexer output right channel o 17 qual stereodecoder quality output o 18 smute soft mute drive i 19 scl i 2 c clock line i 20 sda i 2 c data line i/o 21 gnd supply ground s 22 vs supply voltage s 23 outrr right rear speaker output o 24 outlr left rear speaker output o 25 outrf right front spaeaker output o 26 outlf left front speaker output o 27 acoutr pre-speaker ac output right channel o 28 acoutl pre-speaker ac output left channel o obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 4/34 4 audio processor part 4.0.1 input multiplexer quasi-differential cd and cassette stereo input am mono input phone inverting input multiplexer signal after in-gain available at separate pins 4.0.2 volume control 1db attenuator max. gain 15db max. attenuation 79db 4.0.3 bass control 2nd order frequency response q-factor programmable in 4 steps center frequency programmable in 4(5) steps dc gain programmable 15 x 1db steps 4.0.4 mid control 2 nd order frequency response q-factor programmable in 2 steps center frequency programmable in 4 steps 15 x1db steps 4.0.5 treble control ?2 nd order frequency response ? center frequency programmable in 4 steps ? 15 x 1db steps 4.0.6 speaker control 4 independent speaker controls in 1db steps max gain 15db max. attenuation 79db 4.0.7 mute functions direct mute digitally controlled softmute with 4 programmable mute time. 4.1 electrical characteristics table 6. 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 inputs except phone 70 100 130 k ? v cl clipping level 2.2 2.6 v rms s in input separation 80 100 db g in min min. input gain -1 0 1 db g in max max. input gain 13 15 17 db g step step resolution 0.5 1 1.5 db v dc dc steps adjacent gain step -5 0.5 5 mv gmin to gmax -10 5 10 mv differential cd stereo input r in input resistance differential 70 100 130 k ? common mode 70 100 130 k ? cmrr common mode rejection ratio v cm = 1v rms @ 1khz 45 70 db v cm = 1v rms @ 10khz 45 60 db e n output noise @ speaker outputs 20hz to 20khz flat; all stages 0db 615mv phone input r in input resistance 40 56 k ? ()() obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
5/34 TDA7407D volume control g max max gain 13 15 17 db a max max attenuation 70 79 db a step step resolution 0.5 1 1.5 db e a attenuation set error g = -20 to 20db -1.25 0 1.25 db g = -60 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 gmin 0.5 5 mv soft mute/afs a mute mute attenuation 80 100 db t d delay time t1 0.48 ms t2 0.96 ms t3 40.4 ms t4 324 ms v th low low threshold for sm-/afs- pin 1) 1v v th high high threshold for sm-/afs-pin 2.5 v r pd internal pull-up resistor 45 k ? bass control c range control range 13 15 17 db a step step resolution 0.5 1 1.5 db f c center frequency f c1 54 60 66 hz f c2 63 70 77 hz f c3 72 80 88 hz f c4 90 100 (150) (2) 110 hz q bass quality factor q 1 0.9 1 1.1 q 2 1.11.251.4 q 3 1.3 1.5 1.7 q 4 1.8 2 2.2 dc gain bass-dc-gain dc = off -1 0 1 db dc = on 3.5 4.4 5.5 db mid control c range control range 13 15 17 db a step step resolution 0.5 1 1.5 db table 6. 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 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 6/34 f c center frequency f c1 450 500 550 hz f c2 0.9 1 1.1 khz f c3 1.35 1.5 1.65 khz f c4 1.8 2 2.2 khz q mid quality factor q 1 0.9 1 1.1 q 2 1.8 2 2.2 treble control c range control range 13 15 17 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 speaker attenuators r in input impedance 35 50 65 k ? g max max gain 13 15 17 db a max max attenuation -70 -79 db a step step resolution 0.5 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 0.1 5 mv audio outputs v clip clipping level d = 0.3% 2.2 2.6 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 general e no output noise bw = 20 hz to 20 khz output muted 315 v bw = 20 hz to 20 khz all gain = 0db 6.5 15 v s/n signal to noise ratio all gain = 0db flat; v o = 2v rms 102 110 db bass treble at 12db; a-weighted; v o = 2.6v rms 96 100 db d distortion v in = 1v rms ; all stages 0db 0.002 0.1 % v in = 1v rms ; bass & treble = 12db 0.05 0.1 % table 6. 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 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
7/34 TDA7407D 1) the sm pin is active low (mute = 0) 2) see note in programming part 4.2 stereodecoder part. 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 bus inputs v il input low voltage d = 0.3% 0.8 v v ih input high voltage 2.5 v i in input current v in = 0.4v -5 5 a v o output voltage sda i o = 1.6ma 0.4 v table 7. electrical characteristics (v s = 9v; deemphasis time constant = 50 s,v mpx = 500mv(75khz deviation), fm= 1khz, gv = 6db, t amb = 25c; unless otherwise specified) symbol parameter test condition min. typ. max. unit v in mpx input level g v = 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 gmax max. input gain 8.5 11 12.5 db gstep step resolution 1.75 2.5 3.25 db svrr supply voltage ripple rejection vripple = 100mv; f = 1khz 35 60 db max. channel separation 30 50 db thd total harmonic distortion 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 = 1 10 19 25 mv pll ? f/f capture range 0.5 % deemphasis and highcut t hc50 deemphasis time constant bit 7, subadr, 10 = 0, v level >> v hch 25 50 75 s t hc75 deemphasis time constant bit 7, subadr, 10 = 1, v level >> v hch 50 75 100 s t hc50 highcut time constant bit 7, subadr, 10 = 0, v level >> v hcl 100 150 200 s t hc75 highcut time constant bit 7, subadr, 10 = 1, v level >> v hcl 150 225 300 s table 6. 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 sn + n - ---------- --- obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 8/34 notes to the characteristics: 1. intermodulation suppression: ; f s = (2 x 10khz) - 19khz ; f s = (3 x 13khz) - 38khz measured with: 91% pilot signal; fm = 10khz or 13khz. 2. traffic radio (v.f.) suppression: measured with: 91% stereo signal; 9% pilot signal; fm=1khz; 5% sub- stereoblend-and highcut-control ref5v internal reference voltage 4.7 5 5.3 v t cref5v temperature coefficient 3300 ppm l gmin min. level gain -1 0 1 db l gmax max. level gain 8 10 12 db l gstep level gain step resolution 0.3 0.67 1 db vsbl min min. voltage for mono 25 29 33 %ref5v vsbl max min. voltage for mono 54 58 62 %ref5v vsbl step step resolution 2.2 4.2 6.2 %ref5v vhch min min. voltage for no highcut 38 42 46 %ref5v vhch max min. voltage for no highcut 62 66 70 %ref5v vhch step step resolution 5 8.4 12 %ref5v vhcl min min. voltage for full highcut 12 17 22 %vhch vhcl max max. voltage for full highcut 28 33 38 %vhch vhcl step step resolution 2.2 4.2 6.2 %vhch carrier and harmonic suppression at the output 19 pilot signal f = 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) 2f mod = 10khz, f spur = 1khz 65 db 3f mod = 13khz, f spur = 1khz 75 db traffic ratio (note 2) 57 signal f = 57khz 70 db sca - subsidiary communications authoorization (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 = 50 s,v mpx = 500mv(75khz deviation), fm= 1khz, gv = 6db, t amb = 25c; unless otherwise specified) symbol parameter test condition min. typ. max. unit 2 v osignal () at1khz () v o spurious () at1khz () --------------------------------------------------- --- = 3 v osignal () at1khz () v o spurious () at1khz () --------------------------------------------------- --- = obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
9/34 TDA7407D carrier (f = 57khz, fm = 23hz am, m = 60%) 3. sca ( subsidiary communications authorization ) measured with: 81% mono signal; 9% pilot signal; fm = 1khz; 10%sca - subcarrier ( fs = 67khz, unmodulated ). ; f s =(2 x 38khz) - 67khz 4. aci ( adjacent channel interference ): ; f s = 110khz - (3 x 38khz) ; f s = 186khz - (5 x 38khz) measured with: 90% mono signal; 9% pilot signal; fm =1khz; 1% spurious signal( fs = 110khz or 186khz, unmodulated). 5 noise blanker part internal 2nd order 140khz high pass filter programmable trigger threshold trigger threshold dependent on high frequency noise with programmable gain additional circuits for deviation and fieldstrength dependent trigger adjustment very low offset current during hold time due to opamps wmos inputs four selectable pulse suppression times programmable noise rectifier charge/discharge current table 8. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit v tr trigger threshold 0) 1) meas. with v peak = 0.9v nbt = 111 (c) 30 (c) mv op nbt = 110 (c) 35 (c) mv op nbt = 101 (c) 40 (c) mv op nbt = 100 (c) 45 (c) mv op nbt = 011 (c) 50 (c) mv op nbt = 010 (c) 55 (c) mv op nbt = 001 (c) 60 (c) mv op nbt = 000 (c) 65 (c) mv op v trnoise noise controlled trigger threshold 2) meas. with v peak = 1.5v nct = 00 (c) 260 (c) mv op nct = 01 (c) 220 (c) mv op nct = 10 (c) 180 (c) mv op nct = 11 (c) 140 (c) mv op v rect rectifier voltage v mpx = 0mv nrd 6) = 00 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 2.5 2.9 v 57 v.w > f. () v o signal () at1khz () v o spurious () at1khz 23khz () ----------------------------------------------------------------------- --- = 67 v o signal () at1khz () v o spurious () at9khz () --------------------------------------------------- --- = 114 v o signal () at1khz () v o spurious () at4khz () --------------------------------------------------- --- = 114 v o signal () at1khz () v o spurious () at4khz () --------------------------------------------------- --- = obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 10/34 (c) = by design/characterization functionally guaranteed through dedicated test mode structure 0) all thresholds are measured using a pulse with tr =2ms, thigh = 2ms and tf = 10ms. the repetition rate must not increase the peak voltage. 1) nbt represents the noiseblanker byte bits d2, d0 for the noise blanker trigger threshold 2) nat represents the noiseblanker byte bit pair d4, d3 for the noise controlled triggeradjustment 3) ovd represents the noiseblanker byte bit pair d7, d6 for the over deviation detector 4) fsc represents the fieldstrength byte bit pair d1, d0 for the fieldstrength control 5) blt represents the speaker rr byte bit pair d7, d6 for the blanktime adjustment 6) nrd represents the configuration-byte bit pair d1, d0 for the noise rectifier discharge-adjustment 7) pch represents the stereodecoder-byte bit d5 for the noise rectifier charge-current adjustment 8) mpnb represents the highcut-byte bit d7 and the fieldstrength-byte d7 for the noise rectifier multipath adjustment figure 4. v rect dev deviation dependent rectifier voltage 3) means. with v mpx = 800mv (75khz dev.) ovd = 11 0.5 0.9(off) 1.3 v op ovd = 10 0.9 1.2 1.5 v op ovd = 01 1.7 2.0 2.3 v op ovd = 00 2.5 2.8 3.1 v op v rect fs fieldstrength controlled rectifier voltage 4) means. with v mpx = 0mv v leve l << v sbl (fully mono) fsc = 11 0.5 0.9(off) 1.3 v fsc = 10 0.9 1.4 1.5 v fsc = 01 1.7 1.9 2.3 v fsc = 00 2.1 2.4 3.1 v t s suppression pulse duration 5) signal holdnin testmode blt = 00 tbd 38 tbd s blt = 10 tbd 32 tbd s blt = 01 tbd 25.5 tbd s blt = 00 tbd 22 tbd s v rectadj noise rectifier discharge adjustment 6) signal peak in testmode nrd = 00 6) (c) 0.3 (c) v/ms nrd = 01 6) (c) 0.8 (c) v/ms nrd = 10 6) (c) 1.3 (c) v/ms nrd = 11 6) (c) 2.0 (c) v/ms sr peak noise rectifier charge signal peak in testmode pch = 0 7) (c) 10 (c) mv/ s pch = 1 7) (c) 20 (c) mv/ s v adjmp noise rectifier adjustment through multipath 8) signal peak in testmode mpnb = 00 8) (c) 0.3 (c) v/ms mpnb = 01 8) (c) 0.5 (c) v/ms mpnb = 10 8) (c) 0.7 (c) v/ms mpnb = 11 8) (c) 0.9 (c) v/ms table 8. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit v op v in dc t r t high t f time d97au636 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
11/34 TDA7407D figure 5. trigger threshold vs.v peak figure 6. deviation controlled trigger adjustment figure 7. fieldstrength controlled trigger adjustment 65mv 30mv 8 steps noise controlled trig. threshold min. trig. threshold 260mv(00) 220mv(01) 180mv(10) 140mv(11) 0.9v vth 1.5v v peak(v) d97au648 v peak (v op ) d97au649 20 deviation(khz) 0.9 1.2 2.0 2.8 detector off (11) 32.5 45 75 10 01 00 2.4v(00) 0.9v v peak e' d97au650 1.9v(01) 1.4v(10) mono stereo noisy signal good signal atc_sb off (11) noise ?3v obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 12/34 6 multipath detector internal 19khz band pass filter programmable band pass and rectifier gain two pin solution fully independent usable for external programming selectable internal influence on stereoblend table 10. quality detector 6.1 description of the audioprocessorpart 6.1.1 input multiplexer cd quasi differential cassette stereo phone inverting am mono stereodecoder input. 6.1.2 input stages most of the input stages have remained the same as in preceeding st audioprocessors with exception of the cd inputs (see figure 8).in the meantime there are some cd players in the market having a significant high source impedance which affects strongly the common-mode rejection of the normal differential input stage. the additional buffer of the cd input avoids this drawback and offers the full common-mode rejec- table 9. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit f cmp center frequency of multipath- bandpass stereodecoder locked on pilottono 19 khz g bpmp bandpass gain bits d 2 , d 1 configuration byte = 00 6db bits d 2 , d 1 configuration byte = 10 12 db bits d 2 , d 1 configuration byte = 01 16 db bits d 2 , d 1 configuration byte = 11 18 db g rectmp rectifier gain bits d 7 , d 6 configuration byte = 00 7.6 db bits d 7 , d 6 configuration byte = 01 4.6 db bits d 7 , d 6 configuration byte = 10 0db bits d 7 , d 6 configuration byte = 11 off db i chmp rectifier charge current bit d 5 configuration byte = 0 0.5 a bit d 5 configuration byte = 1 1.0 a i dismp rectifier discharge current 0.5 1 1.5 ma symbol parameter test condition min. typ. max. unit a multipath influence factor addr. 12 / bit 5+6 00 01 10 11 0.7 0.85 1.00 1.15 db db db db b noise influence factor addr. 16 / bit 1+2 00 01 10 11 15 12 9 6 db db db db obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
13/34 TDA7407D tion even with those cd players. the output of the cd stage is permanently available of the cd out-pins 6.1.3 autozero in order to reduce the number of pins there is no ac coupling between the in-gain and the following stage, so that any offset generated by or before the in-gain stage would be transferred or even amplified to the output. to avoid that effect a special offset cancellation stage called autozero is implemented. this stage is located before the volume-block to eliminate all offsets generated by the stereodecoder, the input stage and the in-gain (please notice that externally generated offsets, e.g. generated through the leakage current of the coupling capacitors, are not cancelled). the auto-zeroing is started every time the data-byte 0 is selected and takes a time of max. 0.3ms. to avoid audible clicks the audioprocessor is muted before the volume stage during this time. 6.1.4 autozero remain in some cases, for example if the p is executing a refresh cycle of the i 2 c bus programming, it is not useful to start a new autozero action because no new source is selected and an undesired mute would appear at the outputs. for such applications the TDA7407D could be switched in the "auto zero 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. 6.1.5 multiplexer output the output signal of the input multiplexer is available at separate pins (please see the blockdiagram). this signal represents the input signal amplifier by the in gain stage and is also going into the mixer stage. 6.1.6 softmute the digitally controlled softmute stage allows muting/demuting the signal with a i 2 c bus programmable slope. the mute process can either be activated by the softmute pin or by the i 2 c bus. the slope is real- ized in a special s shaped curve to mute slow in the critical regions (see figure 9). figure 8. input stages 15k 15k 100k cd+ cd- 15k 15k + - 27k 28k phone- 27k 28k + - d98au854d 100k 100k 100k stereodecoder in gain cassette am mpx 1 1 100k obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 14/34 figure 9. softmute timing for timing purposes the bit 3 of the i 2 c bus output register is set to 1 from the start of muting until the end of demuting. 6.2 bass there are four parameters programmable in the bass stage: (see figs 10, 11, 12, 13): 6.2.1 attenuation figure 10 shows the attenuation as a function of frequency at a center frequency at a center frequency of 80hz. 6.2.2 center frequency figure 11 shows the four possible center frequencies 60,70,80 and 100hz. 6.2.3 quality factors figure 12 shows the four possible quality factors 1, 1.25, 1.5 and 2. 6.2.4 dc mode in this mode the dc gain is increased by 5.1db. 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. 6.3 mid there are 3 parameters programmable in the mid stage (see figs. 14, 15 & 16) 6.3.1 attenuation figure 14 shows the attenuation as a function of frequency at a center frequency of 1khz. 6.3.2 center frequency figure 15 shows the four possible center frequencies 500hz, 1khz, 1.5khz and 2khz. 6.3.3 quality factor figure 16 shows the two possible quality factors 1 and 2 at a center frequency of 1khz. 1 ext. mute +signal ref -signal 1 i 2 c bus out time d97au634 note: please notice that a started mute action is always terminated and could not be interrupted by a change of the mute signal . obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
15/34 TDA7407D 6.4 treble there are two parameters programmable in the treble stage (see figs 17, 18): 6.4.1 attenuation figure 17 shows the attenuation as a function of frequency at a center frequency of 17.5khz. 6.4.2 center frequency figure 15 shows the four possible center frequency (10, 12.5, 15 and 17.5khz). 6.4.3 ac coupling in some applications additional signal manipulations are desired, for example surround-sound or more- band-equalizing. for this purpose a ac-coupling is placed before the speaker-attenuators, which can be activated or internally shorted by bit7 in the bass/treble-configuration byte. in short condition the input- signal of the speaker-attenuator is available at ac outputs and the ac input could be used as additional stereo inputs. the input impedance of the ac inputs is always 50k ? . 6.4.4 speaker attenuator the speaker attenuators have exactely the same structure and range like the volume stage. figure 10. bass control @ fc = 80hz, q = 1 figure 11. bass center @ gain = 14db, q = 1 figure 12. bass quality factors @ gain = 14db, fc = 80hz figure 13. bass normal and dc mode @ gain = 14db, fc = 80hz -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k 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 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0k 10.0k note: in general the center frequency, q and dc-mode can be set independently. the exception from this rule is the mode (5/xx1111xx) where the center frequency is set to 150hz instead of 100hz. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 16/34 figure 14. mid control @ fc=1khz, q=1 figure 15. mid center frequency @ gain=14db, q1 figure 16. mid q-factor @ fc=1khz, gain=14db figure 17. treble control @ fc = 17.5khz figure 18. treble center frequencies @ gain = 14db -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 10.0 100.0 1.0k 10.0k 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 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 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
17/34 TDA7407D 6.5 functional description of stereodecoder the stereodecoder part of the TDA7407D (see fig. 19) contains all functions necessary to demodulate the mpx signal like pilot tone dependent mono/stereo switching as well as "stereoblend" and "highcut" functions. 6.5.1 stereodecoder mute the tda7407 has a fast and easy to control rds mute function which is a combination of the audiopro- cessor'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 softmuted. hence a checking of alternate frequencies could be performed. to release the system from the mute con- dition simply the unmute command must be sent: the stereodecoder is unmuted immediately and the au- dioprocessor is softly unmuted. fig. 20 shows the output signal vo 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. figure 19. block diagram of the stereodecoder figure 20. signals during stereodecoder's softmute softmute command std mute v o t d97au638 t t obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 18/34 figure 21. internal stereoblend characteristics if any other source than the stereodecoder is selected the decoder remains muted and the mpx pin is connected to vref to avoid any discharge of the coupling capacitor through leakage currents. 6.5.2 ingain + infilter the ingain stage allows to adjust the mpx signal to a magnitude of about 1vrms internally which is the recommended value. the 4th order input filter has a corner frequency of 80khz and is used to attenuate spikes and nose and acts as an anti allasing filter for the following switch capacitor filters. 6.5.3 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 TDA7407D offers an i 2 c bus programmable roll-off adjustment which is able to compensate the lowpass behaviour of the tuner section. if the tuner attenuation at 38khz is in a range from 7.2% to 31.0% the TDA7407D needs no ex- ternal 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 carradio where the channel sep- aration and the fieldstrength control are trimmed. 6.5.4 deemphasis and highcut. the lowpass filter for the deemphasis allows to choose between a time constant of 50 s and 75 s (bit d7, stereodecoder byte). the highcut control range will be in both cases hc = 2 deemp . inside the highcut control range (between vhch and vhcl) the level signal is converted into a 5 bit word which controls the lowpass time con- stant between deemp ...3 deemp . there by the resolution will remain always 5 bits independently of the absolute voltage range between the vhch and vhcl values. the highcut function can be switched off by i 2 c bus (bit d7, fieldstrength byte set to "0"). 6.5.5 pll and pilot tone detector the pll has the task to lock on the 19khz pilotone during a stereo transmission to allow a correct demod- ulation. the included 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 diagram) can be checked by reading the status byte of the TDA7407D via i 2 c bus. fieldstrength control the fieldstrength input is used to control the high cut and the stereoblend function. in addition the signal can be also used to control the noiseblanker thresholds and as input for the multipath detector. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
19/34 TDA7407D figure 22. relation between internal and external level voltage and setup of stereoblend figure 23. high cut characteristics 6.5.6 level input and gain to suppress undesired high frequency modulation on the highcut and stereoblend function the level sig- nal is lowpass filtered firstly. the filter is a combination of a 1st order rc lowpass at 53khz (working as anti-aliasing filter) and a 1st- order switched capacitor lowpass at 2.2khz. the second stage is a programmable gain stage to adapt the level signal internally to different if device (see testmode section 5 levelintern). the gain is widely programmable in 16 steps from 0db to 10db (step = 0.67db). these 4 bits are located together with the roll-off bits in the "stereodecoder adjustment" byte to simplify a possible adaptation dur- ing the production of the carradio. 6.5.7 stereoblend control the stereoblend control block converts the internal level voltage (level intern) into an demodulator compatible analog signal which is used to control the channel separation between 0db and the maximum separation. internally this control range has a fixed upper limit which is the internal reference voltage ref5v. the lower limit can be programmed between 29.2% and 58%, of ref5v in 4.167% steps (see figs. 22, 23). to adjust the external level voltage to the internal range two values must be defined: the level gain lg and vsbl (see fig. 15). to adjust the voltage where the full channel separation is reached (vst) the level gain lg has to be defined. the following equation can be used to estimate the gain: internal voltages t d97au639 vsbl ref 5v setup of vst internal voltages t 33% ref 5v setup of vmo level level intern fieldstrenght voltage vst vmo level intern 42% 50% 58% vsbl vst vmo fieldstrenght voltage lowpass time constant d97au640 deemp fieldstrenght vhch vhcl 3 ? deemp l g ref5v field strenght voltage [stereo] ----------------------------------------------------------------------------------- --- - = obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 20/34 the gain can be programmed through 4 bits in the "stereodecoder-adjustment" byte. the mono voltage vmo (0db channel separation) can be choosen selecting vsblall necessary internal reference voltages like ref5v are derived from a bandgap circuit. therefore they have a temperature co- efficient near zero. this is useful if the fieldstrength signal is also temperature compensated. but most if devices apply a level voltage with a tc of 3300ppm. the TDA7407D offers this tc for the reference voltages, too. the tc is selectable with bit d7 of the "stereodecoder adjustment" byte. 6.5.8 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 fig. 23). 6.6 functional description of the noiseblanker in the automotive environment the mpx signal is disturbed by spikes produced by the ignition and for ex- ample the wiper motor. the aim of the noiseblanker part is to cancel the audible influence of the spikes. therefore the output of the stereodecoder is held at the actual voltage for a time between 22 and 38 s (programmable). the block diagram of the noiseblanker is given in fig. 24. 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. to avoid any crosstalk to the signalpath the noiseblanker is supplied by his own biasing circuit. 6.6.1 trigger path 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 lowpass filtered to generate a signal called peak. also noise with a frequen- cy 140khz increases the peak voltage. the resulting voltage can be adjusted by use of the noise rectifier discharge current. 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-trigger- able monoflop. the monoflop's output activates the sample-and-hold circuits in the signalpath for selected duration. figure 24. block diagram of the noiseblanker + - rectifier lowpass rect + + threshold generator vth peak additional threshold control monoflop holdn mpx d98au856 mpx control obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
21/34 TDA7407D 6.6.2 automatic noise controlled thresholdadjustment (atc) there are mainly two independent possibilities for programming the trigger threshold: a the low threshold in 8 steps (bits d0 to d2 of the noiseblanker byte) b the noise adjusted threshold in 4 steps (bits d3 and d4 of the noiseblanker byte). the low threshold is active in combination with a good mpx signal without any noise; the peak voltage is less than 1v. the sensitivity in this operation is high. if the mpx signal is noisy 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 particular gain is programmable in 4 steps. 6.7 automatic threshold control mechanism 6.7.1 automatic threshold control by the stereoblend voltage besides the noise controlled threshold adjustment there is an additional possibility for influencing the trig- ger threshold. it is depending 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. ). in some cases the behaviour of the noiseblanker can be improved by increasing the threshold even in a region of higher fieldstrength. some- times a wrong triggering occures 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 threshold increase is programmable in 3 steps or switched off with bits d0 and d1 of the fieldstrength control byte. figure 25. block diagram of the multipath detector 6.7.2 over deviation detector if the system is tuned to stations with a high deviation the noiseblanker can trigger on the higher frequen- cies of the modulation. to avoid this wrong behaviour, which causes noise in the output signal, the noise- blanker offers a deviation dependent threshold adjustment. by rectifying the mpx signal a further signal representing the actual deviation is obtained. it is used to in- crease the peak voltage. offset and gain of this circuit are programmable in 3 steps with the bits d6 and d7 of the stereodecoder byte (the first step turns off the detector, see fig. 25). 6.8 functional description of the multipath detector using the internal multipath detector the audible effects of a multipath condition can be minimized. a mul- tipath condition is detected by rectifying the 19khz spectrum in the fieldstrength signal.an external capac- itor is used to define the attack and decay times. the mpout pin is used as detector output connected to a capacitor of about 47nf and additionally the mpin pin is selected to be the fieldstrength input. using the obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 22/34 configuration an external adaptation to the user's requirement is given in fig.25. to keep the old value of the multipath detector during an af-jump, the external capacitor can be discon- nected by the mp-hold switch. this switch can be controlled directly by the afs-pin. selecting the "internal influence" in the configuration byte, the channel separation is automatically reduced during a multipath condition according to the voltage appearing at the mp_out pin. a possible application is shown in fig. 25. 6.8.1 programming to obtain a good multipath performance an adaptation is necessary. therefore tha gain of the 19khz bandpass is programmable in four steps as well as the rectifier gain. the attack and decay times can be set by the external capacitor value. 6.9 quality detector the TDA7407D offers a quality detector output which gives a voltage representing the fm reception con- ditions. to calculate this voltage the mpx noise and the multipath detector output are summed according to the following formula: quality = 1.6 (v noise -0.8v)+ a (ref5v - v mpout ) the noise signal is the peak signal without additional influences. the factor "a" can be 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 a/d converter for rds applications. 6.9.1 af search control the TDA7407D is supplied with several functionality to support af-checks using the stereodecoder. as mentioned already before the highohmic-mute feature avoids any clicks during the jump condition. it is possible a the same time to evaluate the noise- and multipath-content of the alternate frequency by using the quality detector output. therefore the multipath-detector is switched automatically to a small time-con- stant. one additional pin (afs) is implemented in order to separate the audioprocessor-mute and stereodecoder af-functions. in figure 24 the block diagram and control-functions of the complete afs-functionality is shown (please note that the pins afs and sm are active low as well as all control-bits indicated by an overbar). 6.10 test mode during the test mode, which can be activated by setting bit d0 of the testing byte and bit d5 of the subad- dress byte to "1", several internal signals are available at the cassr pin. during this mode the input resistor of 100kohm is disconnected from the pin. the internal signals available are shown in the software specification. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
23/34 TDA7407D figure 26. mute control logic 7i 2 c bus interface description 7.1 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) figure 27. d97au627 s 1 0 0 0 1 1 0 r/w ack ack ack p msb lsb msb lsb msb lsb chip address x i subaddress data 1 to data n az t a3 a2 a1 a0 data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 24/34 s = start ack = acknowledge az = autozero-remain t = testing i = autoincrement p = stop max clock speed 500kbits/s the transmitted data is automatically updated after each ack. transmission can be repeated without new chip address. 7.2 auto increment if bit i in the subaddress byte is set to "1", the autoincrement of the subaddress is enabled. table 11. transmitted data (send mode) sm = soft mute activated st = stereo x = not used table 12. subaddress (receive mode) msb lsb xxxxstsmxx msb lsb function i3 i2 i1 i0 a3 a2 a1 a0 0 1 autozero remain off on 0 1 testmode 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 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 input multiplexer volume tr e bl e bass speaker attenuator lf speaker attenuator rf speaker attenuator lr speaker attenuator rr soft mute / bass prog. stereodecoder noiseblanker high cut control fieldstrength & quality configuration eeprom te s t i n g new quality/control middle filter obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
25/34 TDA7407D 8 data byte specification after power on reset all register are set to 11111110 table 13. input selector (subaddress 0h) table 14. volume and speaker attenuation (subaddress 1h, 4h, 5h, 6h, 7h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 source selector cd cassette phone am stereo decoder not allowed mute not allowed 0 0 : 1 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1 in-gain 15db 14db : 1 db 0 db 1 must be ?1? msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 1 : 1 1 0 : 0 0 0 : 0 0 1 : 1 1 1 : 0 0 1 : 0 0 1 : 0 0 1 : 1 0 not used configurations 1 : 1 0 0 0 : 0 0 : 0 0 0 : 0 0 0 0 : 0 0 : 1 1 0 : 0 0 0 0 : 0 0 : 0 0 0 : 0 0 0 0 : 0 1 : 0 0 1 : 0 0 0 0 : 1 0 : 1 1 1 : 0 0 0 0 : 1 0 : 1 1 1 : 0 0 0 0 : 1 0 : 1 1 1 : 1 0 0 1 : 1 0 : 0 1 +15db : +1db 0db 0db -1db : -15db -16db : -78db -79db x11xxxxxmute obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 26/34 table 15. treble filter (subaddress 2h) table 16. bass filter (subaddress 3h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 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 10.0khz 12.5khz 15.0khz 17.5khz 1 must be ?1? msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 bass steps -15db -14db : -1db 0db 0db +1db : +14db +15db 0 0 1 1 0 1 0 1 bass q-factor 1.0 1.25 1.50 2.0 0 1 bass dc mode off on obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
27/34 TDA7407D table 17. soft mute and bass programming (subaddress 8h) 1 only for bass q-factor = 2.0 table 18. stereodecoder (subaddress 9h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 0 0 1 1 0 1 0 1 0 1 mute enable soft mute disable soft mute mutetime = 0.48ms mutetime = 0.96ms mutetime = 40.4ms mutetime = 324ms stereodecoder soft mute influence = on stereodecoder soft mute influence = off 0 0 1 1 1 0 1 0 1 1 bass center frequency center frequency = 60 hz center frequency = 70 hz center frequency = 80 hz center frequency = 100hz center frequency = 150hz (1) 0 0 1 1 0 1 0 1 noise blanker time 38 s 25.5 s 32 s 22 s msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 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 1 must be ?1? 0 1 forced mono mono/stereo switch automatically 0 1 noiseblanker peak charge current low noiseblanker peak charge current high 0 1 pilot threshold high pilot threshold low 0 1 deemphasis 50 s deemphasis 75 s obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 28/34 table 19. noiseblanker (subaddress ah) table 20. high cut (subaddress bh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 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 1 noise blanker off noise blanker on 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 msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 high cut off high cut on 0 0 1 1 0 1 0 1 max. high cut 2db max. high cut 5db max. high cut 7db max. high cut 10db 0 0 1 1 0 1 0 1 vhch at 42% ref 5v vhch at 50% ref 5v vhch at 58% ref 5v vhch at 66% ref 5v 0 0 1 1 0 1 0 1 vhcl at 16.7% vhch vhcl at 22.2% vhch vhcl at 27.8% vhch vhcl at 33.3% vhch 0 1 strong multipath influence on peak 18k off on (18k discharge if v mpout <2.5v) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
29/34 TDA7407D table 21. fieldstrength control (subaddress ch) table 22. configuration (subaddress dh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 vsbl at 29% ref 5v vsbl at 33% ref 5v vsbl at 38% ref 5v vsbl at 42% ref 5v vsbl at 46% ref 5v vsbl at 50% ref 5v vsbl at 54% ref 5v vsbl at 58% ref 5v 0 0 1 1 0 1 0 1 noiseblanker field strength adj 2.3v noiseblanker field strength adj 1.8v noiseblanker field strength adj 1.3v noiseblanker field strength adj off 0 0 1 1 0 1 0 1 quality detector coefficient a = 0.7 quality detector coefficient a = 0.85 quality detector coefficient a = 1.0 quality detector coefficient a = 1.15 0 1 multipath off influence on peak discharge -1v/ms (at mpout = 2.5v msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 1 1 0 1 0 1 noise rectifier discharge resistor r = infinite r = 56k ? r = 33k ? r =18k ? 0 1 0 1 0 0 1 1 multipath detector bandpass gain 6db 12db 16db 18db 0 1 multipath detector internal influence on off 0 1 multipath detector charge current 0.5 a multipath detector charge current 1 a 0 0 1 1 0 1 0 1 multipath detector reflection gain gain = 7.6db gain = 4.6db gain = 0db disabled obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 30/34 table 23. stereodecoder adjustment (subaddress eh) table 24. testing (subaddress fh) note : this byte is used for testing or evaluation purposes only and must not be set to other values than the default "11111110 " in the appli- cation! msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 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 0.66db 1.33db : 10db msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 stereodecoder test signals off test signals enabled if bit d5 of the subaddress (test mode bit) is set to "1", too 0 1 external clock internal clock 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 at cass_r vhcch level intern pilot magnitude vcocon; vco control voltage pilot threshold holdn nb threshold f228 vhccl vsbl not used not used peak not used ref5v not used 0 1 vco off on 0 1 audioprocessor test mode enabled if bit d5 of the subaddress(test mode bit) is set to "1" off obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
31/34 TDA7407D table 25. new quality / control (subaddress 10h) table 26. mid filter (subaddress 11h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 1 reference generation internal reference-divider external reference force 0 0 1 1 0 1 0 1 quality noise-gain 15db 12db 9db 6db 0 1 sc-clock-mode fast mode normal mode 0 1 auto-zero off on 0 1 smoothing filter on off 0 1 enable af-pin enable pin disable pin 0 1 af-pin st-decoder-mute-influence on off msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 1 : 1 1 1 1 : 0 0 0 1 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 attenuation -15db -14db : -1db 0db 0db +1db : +14db +15db 0 0 1 1 0 1 0 1 middle center-frequency 500hz 1.0khz 1.5khz 2.0khz 01 mid q factor1.02.0 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
TDA7407D 32/34 figure 28. so28 mechanical data & package dimensions so-28 dim. mm inch min. typ. max. min. typ. max. a 2.65 0.104 a1 0.1 0.3 0.004 0.012 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.013 c 0.5 0.020 c1 45 (typ.) d 17.7 18.1 0.697 0.713 e 10 10.65 0.394 0.419 e 1.27 0.050 e3 16.51 0.65 f 7.4 7.6 0.291 0.299 l 0.4 1.27 0.016 0.050 s8 (max.) outline and mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
33/34 TDA7407D 9 revision history table 27. revision history date revision description of changes april 2004 1 first issue obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
information furnished is believed to be accurate and reliable. however, stmicroelectronics assu mes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replac es all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners ? 2005 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com 34/34 TDA7407D obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)

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