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? 1 ? e02826 sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustratin g the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. CXA2194Q 48 pin qfp (plastic) us audio multiplexing decoder description the CXA2194Q is an ic designed as a decoder for the zenith tv multi-channel system and also corresponds with i 2 c bus. functions include stereo demodulation, sap (separate audio program) demodulation, dbx noise reduction and sound processor. various kinds of filters are built in while adjustment, mode control and sound processor control are all executed through i 2 c bus. features ? alignment-free vco and filter audio multiplexing decoder dbx noise reduction decoder sound processor ? two external inputs ? pass switch ? bass control ? treble control ? volume control are all included in a single chip. almost any sort of signal processing is possible through this ic. input level, separation adjustments and each mode control are possible through i 2 c bus. applications tv, vcr and other decoding systems for us audio multiplexing tv broadcasting structure bipolar silicon monolithic ic absolute maximum ratings (ta = 25c) supply voltage v cc 11 v operating temperature topr ?20 to +75 c storage temperature tstg ?65 to +150 c allowable power dissipation p d 0.6 w range of operating supply voltage 9 0.5 v ? a license of the dbx-tv noise reduction system is required for the use of this device.
? 2 ? CXA2194Q block diagram 1 48 trel trer 47 bassl2 46 bassl1 45 bassr2 44 bassr1 42 lpin-l 41 lpin-r 40 lpout-l 39 lpout-r 38 aux2-l 37 14 15 16 17 18 19 22 23 24 aux2-r compin vgr iref gnd saptc v cc stin noisetc sapout 2 lsout-r 3 lsout-l 4 sda 5 scl 6 dgnd 8 mainin 9 mainout 11 pcint1 12 33 32 31 30 28 27 26 25 pcint2 13 21 plint subout 36 35 aux1-l aux1-r vcawgt vcatc vcain veout vetc vewgt ve sapin iref i 2 c bus i/f sapind sapvco bpf lpf stind vca lpf deem lpf deem ve hpf lpf rmsdet vca tvsw matrix passsw vol-r vol-l bass bass treb treb lpf sw rmsdet logic lpf flt vco lflt 1/4 1/2 vca noise det amp (+4db) at t (+6db) "stereo" "noise" "sap" "ponres" wideband nrsw/fomo/sapc spectral fext2 tvsw/ext/m1 psw vol-l vol-r bass treble m2 fext1
? 3 ? CXA2194Q pin configuration (top view) 1 48 trel trer 47 bassl2 46 bassl1 45 bassr2 44 bassr1 43 nc 42 lpin-l 41 lpin-r 40 lpout-l 39 lpout-r 38 aux2-l 37 13 14 15 16 17 18 19 20 21 22 23 24 aux2-r plint compin vgr iref gnd saptc v cc nc subout stin noisetc sapout 2 lsout-r 3 lsout-l 4 sda 5 scl 6 dgnd 7 nc 8 mainin 9 mainout 10 nc 11 pcint1 12 36 35 34 33 32 31 30 29 28 27 26 25 pcint2 aux1-l aux1-r nc vcawgt vcatc vcain veout nc vetc vewgt ve sapin
? 4 ? CXA2194Q pin description (ta = 25 c, v cc = 9v) pin no. symbol pin voltage equivalent circuit description 44 bassr1 4.0v bass filter pin. (right channel) (connect a 47nf capacitor between pins 44 and 45.) the cutoff frequency is determined by the built-in resistor and the external capacitance. 45 bassr2 4.0v 46 bassl1 4.0v 47 bassl2 4.0v bass filter pin. (left channel) (connect a 47nf capacitor between pins 46 and 47.) the cutoff frequency is determined by the built-in resistor and the external capacitance. 48 trer 4.0v treble filter pin. (right channel) (connect a 6.8nf capacitor between this pin and gnd.) 1 trel 4.0v treble filter pin. (left channel) (connect a 6.8nf capacitor between this pin and gnd.) 2 lsout-r 4.0v lsout right channel output pin. 3 lsout-l 4.0v lsout left channel output pin. 45 47 44 46 v cc v cc 3k 190 190 4.2k 3.4k 2.7k 2.2k 1.8k 1.4k 1.2k 4.9k 4v 48 1 v cc v cc 3k 580 580 4.2k 3.4k 2.7k 2.2k 1.8k 1.4k 1.2k 4.9k 2 3 v cc v cc 3k 580 580
? 5 ? CXA2194Q 4sda ? serial data i/o pin. v ih > 0v v il < 1.5v 6 dgnd ? digital block gnd. 5 scl ? serial clock input pin. v ih > 3.0v v il < 1.5v 8 mainin 4.0v input the (l + r) signal from mainout (pin 9). 9 mainout 4.0v (l + r) signal output pin. 4 7.5k 4.5k 4k 3k 7.5k 2.1v 35 2 5 v cc 5 10.5k 4k 3k 7.5k 2.1v 35 4 v cc 6 8 147 10k 48k 4v v cc v cc 200 4 147 v cc 15k 1k v cc 9 pin no. symbol pin voltage equivalent circuit description
? 6 ? CXA2194Q 11 pcint1 4.0v stereo block pll loop filter integrating pin. 12 pcint2 4.0v pilot cancel circuit loop filter integrating pin. (connect a 1? capacitor between this pin and gnd.) 13 plint 5.1v audio multiplexing signal input pin. 14 compin 4.0v 11 147 30k v cc 22k 2 12 v cc 4k 2k 147 10k 10k 50 10k 147 v cc 20k 20k 20k 20k 13 26 20k 147 v cc 14 50k 3k 24k 16k 4k 4k 4k 20k 22k 3v pin no. symbol pin voltage equivalent circuit description
? 7 ? CXA2194Q 15 vgr 1.3v band gap reference output pin. (connect a 10? capacitor between this pin and gnd.) 16 iref 1.3v set the filter and vco reference current. the reference current is adjusted with the bus data based on the current which flows to this pin. (connect a 62k ? (?%) resistor between this pin and gnd.) 17 gnd ? analog block gnd. 18 saptc 4.5v set the time constant for the sap carrier detection circuit. (connect a 4.7? capacitor between this pin and gnd.) 19 vcc ? supply voltage pin. 4 v cc 15 147 3k 11k 11k 11k 9.7k 19.4k 2.06k 2 v cc v cc 16 147 16k 1.8k 30p 6.3k 30k 30k 40k 40k 15k 30k 17 50 v cc v cc 18 10k 1k 3k 8k 4k 19 pin no. symbol pin voltage equivalent circuit description
? 8 ? CXA2194Q 21 subout 4.0v (l ? r) signal output pin. 22 stin 4.0v input the (l ? r) signal from subout (pin 21). 25 sapin 4.0v input the (sap) signal from sapout (pin 24). 23 noisetc 3.0v set the time constant for the noise detection circuit. (connect a 4.7? capacitor between this pin and gnd.) 24 sapout 4.0v sap fm detector output pin. 2k 2k 2k v cc 147 14.4k 2k 4k 2k 580 580 1k 10p 4k 21 v cc 147 4v 18k 4v 18k 20k 11.7k 23k 23k 25 147 22 2 23 v cc v cc 4k 200k 3.3k 4v 3k 2k 1k 8k 10k 3k 50 v cc 147 24 580 580 5p 4k 10 24k 10k pin no. symbol pin voltage equivalent circuit description
? 9 ? CXA2194Q 26 ve 4.0v variable de-emphasis integrating pin. (connect a 2700pf capacitor and a 3.3k ? resistor in series between this pin and gnd.) 27 vewgt 4.0v weight the variable de-emphasis control effective value detection circuit. (connect a 0.047? capacitor and a 3k ? resistor in series between this pin and gnd.) 28 vetc 1.7v determine the restoration time constant of the variable de-emphasis control effective value detection circuit. (the specified restoration time constant can be obtained by connecting a 3.3? capacitor between this pin and gnd.) 30 veout 4.0v variable de-emphasis output pin. (connect a 4.7? non- polar capacitor between pins 30 and 31.) 7.5k 147 26 v cc 2.9v 36k 4v 8 30k 8k 580 580 147 27 v cc 50 4k 7.5 4 4 20k 28 v cc 50 4k 10k 5p 580 30 v cc 580 pin no. symbol pin voltage equivalent circuit description
? 10 ? CXA2194Q 31 vcain 4.0v vca input pin. input the variable de-emphasis output signal from pin 30 via a coupling capacitor. 32 vcatc 1.7v determine the restoration time constant of the vca control effective value detection circuit. (the specified restoration time constant can be obtained by connecting a 10? capacitor between this pin and gnd.) 33 vcawgt 4.0v weight the vca control effective value detection circuit. (connect a 1? capacitor and a 3.9k ? resistor in series between this pin and gnd.) 35 aux1-r 4.0v right channel external input 1 pin. 36 aux1-l 4.0v left channel external input 1 pin. 37 aux2-r 4.0v right channel external input 2 pin. 38 aux2-l 4.0v left channel external input 2 pin. 31 v cc 47k 47k v cc 20k 7.5 4 20k 32 v cc 50 4k 4 8 40k 40k v cc 580 580 8k 3p 147 33 30k 50 4k 36k 2.9v 10k 27.5k v cc 27.5k 4v 35 36 37 38 pin no. symbol pin voltage equivalent circuit description
? 11 ? CXA2194Q 39 lpout-r 4.0v lpout right channel output pin. 40 lpout-l 4.0v lpout left channel output pin. 41 lpin-r 4.0v right channel loop input pin. 42 lpin-l 4.0v left channel loop input pin. 7 10 20 29 34 43 nc nc nc nc nc nc ? ? ? ? ? ? v cc 580 3k 580 147 39 40 4v v cc 10k 47k 147 41 42 7 10 20 29 34 43 pin no. symbol pin voltage equivalent circuit description
? 12 ? CXA2194Q electrical characteristics compin input level (100% modulation level) main (l + r) (pre-emphasis: off) = 245mvrms sub (l ? r) (dbx-tv: off) = 490mvrms pilot = 49mvrms sap carrier = 147mvrms f h = 15.734khz (ta = 25 c, vcc = 9v) current consumption main output level main de-emphasis frequency characteristic main lpf frequency characteristic main distortion main overload distortion main s/n sub output level sub lpf frequency characteristic sub distortion sub overload distortion sub s/n st sap crosstalk icc vmain fcdeem fcmain thdm thdmmax snmain vsub fcsub thdsub thdsmax snsub ctst mono mono mono mono mono mono st st st st st sap 14 14 14 14 14 14 14 14 14 14 14 14 14 no signal mono 1khz 100% mod. pre-em. on mono 5khz 30% mod. pre-em. on mono 12khz 30% mod. pre-em. on mono 1khz 100% mod. pre-em. on mono 1khz 200% mod. pre-em. on mono 1khz, pre-em. on sub (l-r), 1khz, 100% mod., nr off sub (l-r) 12khz, 30% mod., nr off sub (l-r) 1khz, 100% mod., nr off sub (l-r), 1khz, 200% mod., nr off sub (l-r) 1khz, nr off sub (l-r), 1khz, 100% mod., nr on, sap carrier (5f h ) 20 log ('5k'/'1k') 20 log ('12k'/'1k') 20 log ('100%'/'0%') 20 log ('12k'/'1k') 20 log ('100%'/'0%') 20 log ('nrsw = 0'/ 'nrsw = 1') 15klpf 15klpf 15klpf 15klpf 15klpf 15klpf 1kbpf 39/40 39/40 39/40 39/40 39/40 39/40 21 21 21 21 21 40 30 440 ? 1.2 ? 3.0 ? ? 61 150 ? 3.0 ? ? 56 60 40 490 0 ? 1.0 0.1 0.15 69 190 ? 0.5 0.1 0.2 64 70 item signal mode input pin input signal measurement conditions filter output pin min. typ. 1 2 3 4 5 6 7 8 9 10 11 12 13 no. 50 540 1.0 1.0 0.5 0.5 ? 230 1.0 1.0 2.0 ? ? ma mvrms db db % % db mvrms db % % db db max. unit
? 13 ? CXA2194Q item signal mode input pin input signal measurement conditions filter output pin min. typ. max. unit no. sub pilot leak stereo on level stereo on/off hysteresis sap output level sap lpf frequency characteristic sap distortion sap s/n sap st cross talk sap on level sap on/off hysteresis st separation 1 l r st separation 1 r l st separation 2 l r st separation 2 r l lpout output level pcsub thst hyst vsap fcsap thdsap snsap ctsap thsap hysap stlsep1 strsep1 stlsep2 strsep2 vtp st st sap sap sap sap st sap st st st st ext 14 14 14 14 14 14 14 14 14 14 14 14 35/36 37/38 pilot (f h ) 0db change pilot (f h ) level sap 1khz 100% mod. nr off sap 10khz, 30% mod. nr off sap 1khz 100% mod. nr off sap 1khz, nr off sap 1khz, 100% mod. nr on, pilot (f h ) change sap carrier (5f h ) level st-l 300hz 30% mod. nr on st-r 300hz 30% mod. nr on st-l 3khz 30% mod. nr on st-r 3khz 30% mod. nr on sine wave 1khz, 490mvrms 0db = 49mvrms 0db = 49mvrms 20 log ('on level'/'off level') 20 log ('10k'/'1k') 20 log ('100%'/'0%') 20 log ('nrsw = 1'/'nrsw = 0') 0db = 147mvrms 20 log ( ' on level'/'off level') 0db = 490mvrms f h bpf 15klpf 15klpf 1kbpf 15klpf 15klpf 15klpf 15klpf 21 bus return 24 24 24 24 40 bus return 39/40 39/40 39/40 39/40 39/40 ? ? 9.0 3.5 150 ? 3.0 ? 46 60 ? 12.0 2.0 23 23 23 23 ? 0.5 ? 35 ? 6.0 6.0 190 0 2.5 55 70 ? 9.0 4.0 35 35 35 35 0 ? 27 ? 3.0 8.5 230 2.5 6.0 ? ? ? 6.5 6.0 ? ? ? ? 0.5 db db db mvrms db % db db db db db db db db db 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
? 14 ? CXA2194Q lpout muted amount lsout output level lsout cross talk lsout muted amount lsout dc offset lsout distortion lsout s/n lsout overload distortion bass maximum value bass minimum value treble maximum value treble minimum value volume minimum value mulp1 mulp2 vls ctls muls osls thdls snls thdlsmax tbmax tbmin ttmax ttmin volmin int ext int ext int ext ext int ext ext ext ext ext ext ext ext ext 14 35/36 37/38 14 35/36 37/38 35/36 37/38 14 35/36 37/38 ? 35/36 37/38 35/36 37/38 35/36 37/38 35/36 37/38 35/36 37/38 35/36 37/38 35/36 37/38 35/36 37/38 mono 1khz, 100%, pre-em. on sine wave 1khz, 490mvrms mono 1khz 100%, pre-em. on sine wave 1khz, 490mvrms sine wave 1khz, 490mvrms mono 1khz 100%, pre-em. on sine wave 1khz, 490mvrms no signal sine wave 1khz, 490mvrms sine wave 1khz, 490mvrms sine wave 1khz, 2vrms sine wave 100hz, 245mvrms sine wave 100hz, 245mvrms sine wave 10khz, 245mvrms sine wave 10khz, 245mvrms sine wave 1khz, 490mvrms 20 log (m1 = "0" /m1 = "1") 20 log (m1 = "0" /m1 = "1") 0db = 490mvrms 0db = 490mvrms 0db = 490mvrms ext int 0db = 490mvrms int ext 20 log (m2 =" 0" /m2 = "1") mute (m2 = 0)/ dc difference when there is no signal 20 log ('490mvrms'/ 'no signal') bass = "f" 0db = 245mvrms bass = "0" 0db = 245mvrms treble = "f" 0db = 245mvrms treble = "0" 0db = 245mvrms vol-l = "0", vol-r = "0" 0db = 490mvrms 1kbpf 1kbpf 1kbpf 1kbpf 15klpf 15klpf 15klpf 1kbpf 39/40 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 2/3 ? ? ? 0.9 ? ? ? ? 25 ? 75 ? 11 ? 13 11 ? 13 ? ? 85 ? 90 0 ? 75 ? 90 ? 90 0 0.01 88 0.1 12 ? 12 12 ? 12 ? 90 ? 70 ? 75 0.9 ? 60 ? 80 ? 75 25 0.5 ? 1.0 13 ? 11 13 ? 11 ? 75 db db db db db db mv % db % db db db db db item signal mode input pin input signal measurement conditions filter output pin min. typ. max. unit 29 30 31 32 33 34 35 36 37 38 39 40 41 42 no.
? 15 ? CXA2194Q electrical characteristics measurement circuit signal generator signal generator signal gene- rator v4 ac a v1 ac v3 ac signal gene- rator v2 ac signal gene- rator tantalum tantalum v6 ac c12 4.7 signal gene- rator v5 ac c10 4.7 c2 4.7 c14 10 c15 4.7 buff 15khz lpf f h bpf 1khz bpf s6 c13 1 r1 3.9k r3 220 r2 220 c17 3.3 c18 0.047 r4 3k c3 4.7 c4 4.7 c5 4.7 c6 4.7 c7 4.7 c8 47n c16 4.7 c20 5600p r5 100k c21 0.012 r7 1meg c9 47n c1 6.8n c11 6.8n c19 2700p c28 4.7 c22 4.7 c29 4.7 r6 3.3k s5 s4 s3 s2 s1 filters i 2 c bus data measures c23 100 c25 10 c27 1 c26 4.7 c24 4.7 gnd gnd r8 62k metal ?1% signal generator v8 9v gnd dgnd v7 ac v cc 1 48 trel trer 47 bassl2 46 bassl1 45 bassr2 44 bassr1 43 nc 42 lpin-l 41 lpin-r 40 lpout-l 39 lpout-r 38 aux2-l 37 13 14 15 16 17 18 19 20 21 22 23 24 aux2-r plint compin vgr iref gnd saptc v cc nc subout stin noisetc sapout 2 lsout-r 3 lsout-l 4 sda 5 scl 6 dgnd 7 nc 8 mainin 9 mainout 10 nc 11 pcint1 12 36 pcint2 aux1-l 35 34 33 32 31 30 29 28 27 26 25 aux1-r nc vcawgt vcatc vcain veout nc vetc vewgt ve sapin
? 16 ? CXA2194Q adjustment method the resister data is set to the standard value. 1. att adjustment 1) input a 100hz, 245mvrms sine wave signal to compin and monitor the lpout-l output level. then, adjust the "att" data for att adjustment so that the lpout-l output goes to the standard value (490mvrms). 2) adjustment range: ?0% adjustment bits: 4 bits 2. separation adjustment 1) input st-l signal (modulation factor 30%, frequency 300hz nr-on) to compin. at this time, adjust the "wideband" adjustment data to reduce lpout-r output to the minimum. 2) next, set the frequency only of the input signal to 3khz and adjust the "spectral" adjustment data to reduce lpout-r output to the minimum. 3) the adjustments in 2 and 3 above are performed to optimize the separation. 4) "wideband" "spectral" adjustment range: ?0% adjustment range:?5% adjustment bits: 6 bits adjustment bits: 6 bits note) adjust this ic through tuner and if when this ic is mounted on the set.
? 17 ? CXA2194Q register specifications slave address slave receiver 80h (1000 0000) slave transmitter 81h (1000 0001) register table bit7 bit6 bit5 test-da psw bit4 test1 fext1 bit3 nrsw fext2 bit2 fomo tvsw bit1 sapc ext bit0 m1 m2 ???? 0000 ???? 0001 ???? 0010 ???? 0011 ???? 0100 ???? 0101 ???? 0110 ???? 0111 ???? 1000 ???? 1001 ???? 1010 data sub address msb lsb ? ? spectral (6) wideband (6) vol-l (6) vol-r (6) ? ? bass (4) treble (4) ? ? ? ? ? ? ? : don't care status registers sta1 bit7 power on reset sta2 bit6 stereo sta3 bit5 sap sta4 bit4 noise sta5 bit3 ? sta6 bit2 ? sta7 bit1 ? sta8 bit0 ? note) the microcomputer reads both sap and noise status and judges sap discrimination. att (4) ?
? 18 ? CXA2194Q description of registers control registers register at t spectral wideband test-da test1 vol-l vol-r bass treble nrsw fomo tvsw ext fext1 fext2 psw m1 m2 sapc number of bits 4 6 6 1 1 6 6 4 4 1 1 1 1 1 1 1 1 1 1 classification ? 1 a a a t t u u u u u u u u u u u u u s standard setting 9 1f 1f 0 0 3f 3f 8 8 0 0 0 0 0 0 0 1 1 0 contents input level adjustment adjustment of stereo separation (3khz) adjustment of stereo separation (300hz) dac test mode test mode left channel volume control right channel volume control bass control treble control selection of the output signal (stereo mode, sap mode) forced mono (left channel only is mono during sap output.) selection of tv mode or external input mode selection of external input 1 mode or external input 2 mode (tvsw = 1) external input 1 forced mono external input 2 forced mono selection of internal mode or lpin mode selection of lpout mute function on/off selection of lsout mute function on/off selection of sap mode or l + r mode according to the presence of sap broadcasting ? 1 classification u: user control a: adjustment s: proper to set t: test status registers register number of bits contents ponres stereo sap noise 1 1 1 1 power on reset detection; 1: reset stereo discrimination of the compin input signal; 1: stereo sap discrimination of the compin input signal; 1: sap noise level discrimination of the sap signal; 1: noise
? 19 ? CXA2194Q description of control registers att (4): adjust the signal level input to compin (pin 14) to the standard input level (245mvrms). variable range of the input signal: 245mvrms ? 5.0db to +3.0db 0 = level min. f = level max. spectral (6): perform high frequency (fs = 3khz) separation adjustment. 0 = level max. 3f = level min. wideband (6): perform low frequency (fs = 300hz) separation adjustment. 0 = level min. 3f = level max. test-da (1): set dac output test mode. 0 = normal mode 1 = dac output test mode in addition, the following outputs are present at pin 40. lpout-l (pin 40): da control dc level test1 (1): monitor sapbpf and nrbpf outputs. 0 = normal mode 1 = sapbpf, nrbpf outputs in addition, the following outputs are present at pins 40 and 39. lpout-l (pin 40): sap bpf out lpout-r (pin 39): nr bpf out vol-l (6): lsout-l output signal level control 0 = volume min. ( ? 80db) 3f = volume max. (0db) ? 1.25db/step vol-r (6): lsout-r output signal level control 0 = volume min. ( ? 80db) 3f = volume max. (0db) ? 1.25db/step bass (4): lsout output bass control 0 = bass min. 7 & 8 = bass center (0db) f = bass max. treble (4): lsout output treble control 0 = treble min. 7 & 8 = treble center (0db) f = treble max.
? 20 ? CXA2194Q nrsw (1): select stereo mode or sap mode 0 = stereo mode 1 = sap mode fomo (1): select forced mono mode 0 = normal mode 1 = forced mono mode tvsw (1): select tv mode or external input mode for lpout output. 0 = tv mode 1 = external input mode ext (1): select external input [1] mode or external input [2] mode for lpout output. (tvsw = 1) 0 = external input [1] mode 1 = external input [2] mode fext1 (1): turn external input [1] to forced mono. 0 = normal mode 1 = external input [1] is forced mono. input the same signal to both aux1-l and aux1-r. fext2 (1): turn external input [2] to forced mono 0 = normal mode 1 = external input [2] is forced mono input the same signal to both aux2-l and aux2-r. psw (1) select int mode or lpin mode for lsout output. 0 = int mode 1 = lpin mode m1 (1): mute the lpout-l and lpout-r output. 0 = mute on 1 = mute off m2 (1): mute the lsout-l and lsout-r output. 0 = mute on 1 = mute off sapc (1): select the sap signal output mode when there is no sap signal, the conditions for selecting sap output are selected by sapc. 0 = l + r output is selected 1 = sap output is selected
? 21 ? CXA2194Q description of mode control mode control sapc = 0 sapc = 1 nrsw fomo sapc "select dbx input and tv decoder output" conditions: fomo = 0 nrsw = 0 (mono or st output) during st input: left channel: l, right channel: r during other input: left channel: l + r, right channel: l + r nrsw = 1 (sap output) when there is "sap" during sap discrimination ? left channel: sap, right channel: sap when there is "no sap", output is the same as when nrsw = 0 "select dbx input and tv decoder output" conditions: fomo = 0 nrsw = 0 (mono or st output) as on the left nrsw = 1 (sap output) regardless of the presence of sap discrimination, dbx input: "sap" left channel: sap, right channel: sap however, when there is no sap, sapout output is soft muted ( ? 7db) "forced mono" fomo = 1 during sap output: left channel: l + r, right channel: sap during st or mono output: left channel: l + r, right channel: l + r change the selection conditions for "mono or st output" and "sap output". sapc = 0: switch to sap output when there is sap discrimination. do not switch to sap output when there is no sap discrimination. sapc = 1: switch to sap output regardless of whether there is sap discrimination.
? 22 ? CXA2194Q decoder output and mode control table 1 (sapc = 1) input signal mode mode detection mode control output dbx input st sap noise nrsw fomo sapc lch rch 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 ? ? ? 0 0 1 1 0 0 ? ? 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 1 1 1 ? ? 1 1 0 0 1 1 ? ? 0 0 1 1 ? ? 0 0 1 1 0 1 1 0 1 1 0 0 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 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 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 mute sap sap mute (sap) (sap) l ? r mute l ? r mute sap sap (sap) (sap) mute mute sap sap (sap) (sap) l ? r mute sap sap (sap) (sap) l + r sap l + r l + r (sap) l + r l l + r l l + r sap l + r (sap) l + r l + r l + r sap l + r (sap) l + r l l + r sap l + r (sap) l + r l + r sap sap l + r (sap) (sap) r l + r r l + r sap sap (sap) (sap) l + r l + r sap sap (sap) (sap) r l + r sap sap (sap) (sap) mono ? 1 stereo ? 1 mono & sap stereo & sap note: (sap) : the sapout output signal is soft muted (approximately ? 7db). the signal is soft muted when noise = 1. ? : don't care. ? 1 sap or noise discrimination may be made during mono or stereo input when the noise is inputted in the weak electric field. then microcomputer reads "noise" status from ic and decides whether sap is output. "noise" status rises earlier than "sap" status when the amount of noise is increased to compin.
? 23 ? CXA2194Q decoder output and mode control table 2 (sapc = 0) note: (sap) : the sapout output signal is soft muted (approximately ? 7db). the signal is soft muted when noise = 1. ? : don't care. ? 1 sap or noise discrimination may be made during mono or stereo input when the noise is inputted in the weak electric field. then microcomputer reads "noise" status from ic and decides whether sap is output. "noise" status rises earlier than "sap" status when the amount of noise is increased to compin. input signal mode mode detection mode control output dbx input st sap noise nrsw fomo sapc lch rch 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ? 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 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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 mute mute mute (sap) (sap) l ? r mute l ? r mute l ? r mute (sap) (sap) mute mute sap sap mute mute (sap) (sap) l ? r mute sap sap l ? r mute (sap) (sap) l + r l + r l + r (sap) l + r l l + r l l + r l l + r (sap) l + r l + r l + r sap l + r l + r l + r (sap) l + r l l + r sap l + r l l + r (sap) l + r l + r l + r l + r (sap) (sap) r l + r r l + r r l + r (sap) (sap) l + r l + r sap sap l + r l + r (sap) (sap) r l + r sap sap r l + r (sap) (sap) mono ? 1 stereo ? 1 mono & sap stereo & sap
? 24 ? CXA2194Q tv (l) / tv (r) are selected in matrix. tv (l): mono, st-l, sap tv (r): mono, st-r, sap tvsw mode control table 3 1 2 3 4 5 6 m1 0 1 1 1 1 1 tvsw ? 0 1 1 1 1 ext ? ? 0 0 1 1 fext1 ? ? 0 1 ? ? fext2 ? ? ? ? 0 1 lpout-l mute tv (l) aux1-l aux1-l aux2-l aux2-l lpout-r mute tv (r) aux1-r aux1-l aux2-r aux2-l
? 25 ? CXA2194Q description of operation the us audio multiplexing system possesses the base band spectrum shown in fig. 1. fig. 1. base band spectrum fig. 2. overall block diagram (see fig. 3 for the dbx-tv block) fig 3. dbx-tv block 6.5f h 6f h 5f h 4f h 3f h 2f h f h f 3 telemetry fm 3khz sap dbx-tv nr fm 10khz 50 ? 10khz f h = 15.734khz 15 50 25 5 l + r 50 ? 15khz pilot 25 50 khz peak dev l-r dbx-tv nr am-dsb-sc dbx-tv block noise det sap det inj. lock pll (vco 8f h ) pilot det pilot cansel mvca 2f hl 0? i 2 c bus decoder mode control i 2 c bus decoder i 2 c bus decoder mode control f hl 90? f hl 0? a (sap in) 4.7 nr sw mode control b matrix (lch) (lch) to tvsw 25 (main out) 4.7 9 (compin) 14 (main in) 8 (subout) l + r l ?r 4.7 21 (st in) 22 (sap out) sap lpf sap bpf stereo lpf sap (fm) det 24 nain lpf de. em l-r (dsb) det subvca sub lpf wideband nr sw to matrix vca rms det rms det a b (st in) 22 (sap in) 25 (ve out) 4.7 30 (vca in) lpf hpf variable deemphasis fixed deemphasis lpf 31
26 CXA2194Q fig. 4. sound processor block (1) l + r (main) after the audio multiplexing signal input from compin (pin 14) passes through mvca, the sap signal and telemetry signal are suppressed by stereo lpf. next, the pilot signals are canceled. finally, the l r signal and sap signal are removed by main lpf, and frequency characteristics are flattened (de- emphasized) and input to the matrix. (2) l r (sub) the l r signal follows the same course as l + r before the pilot signal is canceled. l r has no carrier signal, as it is a suppressed-carrier double-sideband amplitude modulated signal (dsb-am modulated). for this reason, the pilot signal is used to regenerate the carrier signal (quasi-sine wave) to be used for the demodulation of the l r signal. in the last stage, the residual high frequency components are removed by sub lpf and the l r signal is input to the dbx-tv block via the nrsw circuit after passing through subvca. (3) sap sap is an fm signal using 5f h as a carrier as shown in the fig. 1. first, the sap signal only is extracted using sap bpf. then, this is subjected to fm detection. finally, residual high frequency components are removed and frequency characteristics flattened using sap lpf, and the sap signal is input to the dbx- tv block via the nrsw circuit. when there is no sap signal, the pin 24 output is soft muted. (4) mode discrimination stereo discrimination is performed by detecting the pilot signal amplitude. sap discrimination is performed by detecting the 5f h carrier amplitude. noise discrimination is performed by detecting the noise near 25khz after fm detection of sap signal. (5) dbx-tv block either the l r signal or sap signal input respectively from st in (pin 22) or sap in (pin 25) is selected by the mode control and input to the dbx-tv block. the input signal then passes through the fixed de-emphasis circuit and is applied to the variable de- emphasis circuit. the signal output from the variable de-emphasis circuit passes through an external capacitor and is applied to vca (voltage control amplifier). finally, the vca output is converted from a current to a voltage using an operational amplifier and then input to the matrix. the variable de-emphasis circuit transmittance and vca gain are respectively controlled by each of effective value detection circuits. each of the effective value detection circuits passes the input signal through a predetermined filter for weighting before the effective value of the weighted signal is detected to provide the control signal. from matrix (lch) (aux2-r) 37 (aux2-l) 38 (aux1-l) (aux1-r) 36 tvsw vol-l vol-r (rch) 35 (lsout-l) (lsout-r) 3 2 (lpout-l) 40 (lpout-r) 39 (lpin-r) 41 (lpin-l) 42 passsw bass treble
27 CXA2194Q (6) matrix, tvsw, passsw the signals (l + r, l r, sap) input to "matrix" become the outputs for the st-l, st-r, mono and sap signals according to the bus data and whether there is st / sap discrimination. "tvsw" switches the "matrix" output signal, external input signal (input to aux1-l, r), external input signal (input to aux2-l, r) and external forced mono. "passsw" switches the "tvsw" output signal and external input signal (input to lpin-l, r). (7) sound processor block the sound processor block contains, "bass/treble" tone control functions, and "volume". bass: 12db (1.7db/step at 100hz) treble: 12db (1.7db/step at 10khz) volume: 0 to 80db ( 1.25db/step) (8) others "mvca" is a vca which adjusts the input signal level to the standard level of this ic. "bias" supplies the reference voltage and reference current to the other blocks. the current flowing to the resistor connecting iref (pin 16) with gnd become the reference current.
28 CXA2194Q application circuit tantalum tantalum 4.7 external input 1 external input 2 4.7 10 4.7 1 3.9k 220 220 3.3 0.047 3k 4.7 4.7 4.7 4.7 5600p 100k 0.012 1meg 47n 6.8n 6.8n 47n 2700p 4.7 4.7 4.7 3.3k 100 +9v 10 4.7 1 4.7 4.7 4.7 gnd composite baseband signal input 62k metal 1% dgnd -com lsout output lpout output lpin input 4.7 4.7 4.7 1 48 trel trer 47 bassl2 46 bassl1 45 bassr2 44 bassr1 43 nc 42 lpin-l 41 lpin-r 40 lpout-l 39 lpout-r 38 aux2-l 37 13 14 15 16 17 18 19 20 21 22 23 24 aux2-r plint compin vgr iref gnd saptc v cc nc subout stin noisetc sapout 2 lsout-r 3 lsout-l 4 sda 5 scl 6 dgnd 7 nc 8 mainin 9 mainout 10 nc 11 pcint1 12 36 pcint2 aux1-l 35 34 33 32 31 30 29 28 27 26 25 aux1-r nc vcawgt vcatc vcain veout nc vetc vewgt ve sapin application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility fo r any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same .
29 CXA2194Q i 2 c bus block items (sda, scl) no. item symbol min. typ. max. unit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 high level input voltage low level input voltage high level input current low level input current low level output voltage sda (pin 4) during 3ma inflow maximum inflow current input capacitance maximum clock frequency minimum waiting time for data change minimum waiting time for start of data transfer low level clock pulse width high level clock pulse width minimum waiting time for start preparation minimum data hold time minimum data preparation time rise time fall time minimum waiting time for stop preparation v ih v il i ih i il v ol i ol c i f scl t buf t hd :sta t low t high t su :sta t hd :dat t su :dat t r t f t su :sto 3.0 0 0 3 0 4.7 4.0 4.7 4.0 4.7 0 250 4.7 5.0 1.5 10 10 0.4 10 100 1 300 v a v ma pf khz s ns s ns s i 2 c bus load conditions: pull-up resistor 4k ? (connect to +5v) load capacity 200pf (connect to gnd) i 2 c bus control signal t hd :sta t su :sta t su :sto t hd :sta t low t hd :dat t su :dat t high t r sda scl t f p sr p s t buf
30 CXA2194Q hl l hi-z start condition s stop condition p sda scl i 2 c bus signal there are two i 2 c signals, sda (serial data) and scl (serial clock) signals. sda is a bidirectional signal. accordingly there are 3 values outputs, h, l and hi-z. i 2 c transfer begins with start condition and ends with stop condition.
31 CXA2194Q i 2 c data write (write from i 2 c controller to the ic) ? data read is performed during scl rise. i 2 c data read (read from the ic to i 2 c controller) read timing sda msb msb l during write ? data can be transferred in 8-bit units to be set as required. sub address is incremented automatically. lsb 123 address ack hi-z hi-z ack sub address 4567891 89 scl s ack hi-z hi-z ack p data data 989 8 1 msb lsb hi-z hi-z ack ack data (n) data (n+1) data (n+2) 189 189 sda h during read 1 address ack hi-z ack p data 67891 789 scl s ic output sda lsb msb ack 5 scl read timing 4 3 2 1 96 7 8 9 ac k data
32 CXA2194Q standard level (100%) input level [db] distortion [%] input signal: mono (pre-emphasis on), 1khz 0db = 100% modulation level vcc = 9v, 30khz using lpf measurement point: lpout-l/r input level vs. distortion characteristics 1 (mono) 10 0 10 0.1 1.0 standard level (100%) input level [db] distortion [%] input signal: stereo l = r (dbx-tvnr on), 1khz 0db = 100% modulation level vcc = 9v, 30khz using lpf, st mode measurement point: lpout-l/r input level vs. distortion characteristics 2 (stereo) 10 0 10 1.0 10 standard level (100%) input level [db] distortion [%] input signal: sap (dbx-tvnr on) 1khz, 0db = 100% modulation level vcc = 9v, 30khz using lpf, sap mode measurement point: lpout-l/r input level vs. distortion characteristics 3 (sap) 10 0 10 1.0 10
33 CXA2194Q frequency [khz] gain [db] stereo lpf frequency characteristics 0 20406080100 10 5 0 5 10 frequency [khz] gain (fc main and fc sub) [db] main lpf and sub lpf frequency characteristics 12 7 510 70 50 20 100 30 10 20 10 0 30 40 20 50 sap frequency characteristics and group delay frequency [khz] 120 20 40 60 80 100 gain [db] 20 90 100 0 10 20 30 40 50 60 70 80 10 0 10 20 group delay [s] group delay 6.2f h 3.8f h 5f h gain
34 CXA2194Q control data vol-l, vol-r lsout output level [db] volume characteristics 0 f 1f 2f 3f 100 80 60 40 20 0 input: aux1, 2 1khz, 490mvrms output: lsout frequency [hz] boost amount [db] bass-treble characteristics 20 100 1k 20k 10k +12 +8 +4 0 4 8 12 input: aux1, 2 245mvrms output: lsout treble. max treble. min bass. max bass. min
35 CXA2194Q package unit: mm sony corporation sony code eiaj code jedec code m package structure package material lead treatment lead material package mass epoxy resin palladium plating copper alloy 48pin qfp (plastic) 15.3 0.4 12.0 0.1 + 0.4 0.8 0.3 0.1 + 0.15 0.24 13 24 25 36 37 48 112 2.2 0.15 + 0.35 0.9 0.2 0.1 0.1 + 0.2 13.5 0.15 0.05 + 0.1 qfp-48p-l04 qfp048-p-1212 0.7g 0.15

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