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CXA2174s us audio multiplexing decoder description the CXA2174s 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 this ic. 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 ?one external input ?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 = 25?) supply voltage v cc 11 v operating temperature topr ?0 to +75 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d 1.35 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. ?1 e00815-ps 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 illustr ating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. 30 pin sdip (plastic) lsout-r 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 lsout-l sda scl dgnd mainin mainout pcint1 pcint2 plint compin vgr iref gnd saptc aux-l aux-r vcawgt vcatc vcain veout vetc vewgt ve sapin sapout noisetc stin subout v cc pin configuration (top view)
2 CXA2174s block diagram vgr iref dgnd scl sda sapout sapin stin ve vewgt vetc veout vcain vcawgt vcatc mainin mainout subout plint pcint1 compin v cc gnd noisetc saptc iref sw lpf lpf hpf rmsdet rmsdet vca ve deem logic vca lpf lpf 1/2 1/4 vco lflt stlpf vca lpf bpf sapvco lpf noise det sapind "ponres" stind "sap" "noise" nrsw/fomo/sapc wideband spectral "stereo" deem flt amp (+4db) i 2 c bus i/f (+6db) pcint2 att 6 7 17 10 9 8 11 16 14 19 15 12 13 5 4 3 20 21 18 22 23 24 25 26 28 27 tvsw matrix vol-r vol-l lsout-l lsout-r 1 2 aux-l aux-r 29 30 exti/mi vol-r vol-l
3 CXA2174s pin description (ta = 25 c, v cc = 9v) 7.5k 4.5k 5 4k 3k 7.5k v cc 35 2.1v 2 3 7.5k 35 2.1v 10.5k 4 4k 3k v cc 4 5 pin no. symbol pin voltage equivalent circuit description sda scl dgnd serial data i/o pin. v ih > 3.0v v il < 1.5v serial clock input pin. v ih > 3.0v v il < 1.5v digital block gnd. 3 4 5 lsout-r 4.0v lsout right channel output pin. 1 lsout-l 4.0v lsout left channel output pin. 2 3k 580 580 v cc 2 1
4 CXA2174s mainout pcint1 pcint2 4.0v 4.0v 4.0v (l + r) signal output pin. stereo block pll loop filter integrating pin. v cc 147 1k 15k 200 v cc 4 7 22k v cc 30k 147 8 4k v cc 2 10k 10k 2k 147 9 7 8 9 pin no. symbol pin voltage equivalent circuit description v cc 147 10k 53k 4v v cc 6 mainin 4.0v input the (l + r) signal from mainout (pin 7). 6
5 CXA2174s compin vgr iref 4.0v 1.3v 1.3v audio multiplexing signal input pin. band gap reference output pin. (connect a 10f capacitor between this pin and gnd.) 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 ? (1%) resistor between this pin and gnd.) 11 12 13 11 v cc 24k 4v 34k 14k 147 24k 24k 40k 40k 30k 30p 1.8k 16k 6.3k 147 30k 15k 30k v cc 2 v cc 13 4 11k 9.7k 19.4k 2.06k 3k 147 v cc 11k 11k 12 pin no. symbol pin voltage equivalent circuit description plint 5.1v pilot cancel circuit loop filter integrating pin. (connect a 1f capacitor between this pin and gnd.) v cc 147 20k 26 20k 10k 20k 50 20k 20k 10 10
6 CXA2174s v cc subout stin 4.0v 4.0v supply voltage pin. (l r) signal output pin. input the (l-r) signal from subout (pin 17). 16 17 18 sapin 4.0v input the (sap) signal from sapout (pin 20). 21 16 2k 2k 2k 4k 1k 147 580 14.4k 580 4k 10p 2k 2k vcc 17 23k 147 18k 20k 11.7k 23k 4v 147 18k 4v v cc 18 21 pin no. symbol pin voltage equivalent circuit description set the time constant for the sap carrier detection circuit. (connect a 4.7f capacitor between this pin and gnd.) saptc 4.5v 15 8k 4k 3k 10k v cc 50 1k v cc 15 gnd analog block gnd. 14 14
7 CXA2174s noisetc 3.0v set the time constant for the noise detection circuit. (connect a 4.7f capacitor between this pin and gnd.) 19 3k 3k 3.3k 4k 4v vcc 8k 2 10k 1k 2k vcc 200k 19 sapout ve 4.0v 4.0v sap fm detector output pin. variable de-emphasis integrating pin. (connect a 2700pf capacitor and a 3.3k ? resistor in series between this pin and gnd.) 20 22 vewgt 4.0v weight the variable de-emphasis control effective value detection circuit. (connect a 0.047f capacitor and a 3k ? resistor in series between this pin and gnd.) 23 24k 10 580 vcc 5p 580 4k 50 10k 147 20 vcc 4v 36k 2.9v 580 147 580 8k 30k 8 4k 50 23 7.5k 147 v cc 22 pin no. symbol pin voltage equivalent circuit description
8 CXA2174s veout vcain 4.0v 4.0v variable de-emphasis output pin. (connect a 4.7f non-polar capacitor between pins 25 and 26.) vca input pin. input the variable de-emphasis output signal from pin 25 via a coupling capacitor. 25 26 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 10f capacitor between this pin and gnd.) 27 vcc 10k 580 580 5p 25 50 v cc 4k 20k 4 4 7.5 27 v cc 20k v cc 47k 47k 26 pin no. symbol pin voltage equivalent circuit description vetc 1.7v determine the restoration time constant of the variable de-rmphasis control effective value detection circuit. (the specified restoration time constant can be obtained by connecting a 3.3f capacitor between this pin and gnd.) 24 20k 7.5 4k 50 vcc 4 4 24
9 CXA2174s vcawgt 4.0v weight the vca control effective value detection circuit. (connect a 1f capacitor and a 3.9k ? resistor in series between this pin and gnd.) 28 4k v cc 30k 8k 36k 2.9v 3p 580 580 147 40k 40k 50 8 28 pin no. symbol pin voltage equivalent circuit description aux-r 4.0v right channel external input pin. left channel external input pin. 29 aux-l 4.0v 30 v cc 4v 30 29 23.5k 23.5k 10k
10 CXA2174s electrical characteristics compin input level (100% modulation level) (ta = 25 c, vcc = 9v) current consumption main output level main de-emphasis frequency response main lpf frequency response main distortion main overload distortion main s/n sub output level sub lpf frequency response sub distortion sub overload distortion sub s/n crosstalk stereo sap cross talk sap stereo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 icc vmain fcdeem fcmain thdm thdmmax snmain vsub fcsub thdsub thdsmax snsub ctst ctsap mono mono mono mono mono mono st st st st st sap st 11 11 11 11 11 11 11 11 11 11 11 11 11 23 440 1.2 3.0 61 150 3.0 56 60 60 32 490 0 1.0 0.1 0.15 69 190 0.5 0.1 0.2 64 70 70 43 540 1.0 1.0 0.5 0.5 230 1.0 1.0 2.0 ma mvrms db db % % db mvrms db % % db db db 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 st-l (r) 1khz, 100% mod., nr on, sap carrier (5f h ) sap 1khz 100% mod. nr on, pilot (f 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') 20 log ('nrsw = 1'/'nrsw = 0') 15klpf 15klpf 15klpf 15klpf 15klpf 15klpf 1kbpf 1kbpf 1/2 1/2 1/2 1/2 1/2 1/2 17 17 17 17 17 2 2 main (l + r) (pre-emphasis: off) = 245mvrms sub (l r) (dbx-tv: off) = 490mvrms pilot = 49mvrms sap carrier = 147mvrms f h = 15.734khz item symbol mode input pin input signal measurement conditions filter output pin min. typ. max. unit no.
11 CXA2174s (ta = 25 c, vcc = 9v) stereo on level stereo on/off hysteresis sap output level sap lpf frequency response sap distortion sap s/n 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 lsout output level lsout mute attenuation lsout distortion lsout overload distortion lsout s/n lsout volume maximum attenuation 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 thst hyst vsap fcsap thdsap snsap thsap hysap stlsep1 strsep1 stlsep2 strsep2 vls muls thdls thdlsmax snls volmin st sap sap sap sap sap st st st st ext ext ext ext ext ext 11 11 11 11 11 11 11 11 11 11 30/29 30/29 30/29 30/29 30/29 30/29 9.0 2.0 130 3.0 46 12.0 2.0 23 23 23 23 440 80 6.0 6.0 160 0 2.5 55 9.0 4.0 35 35 35 35 490 90 0.01 0.03 88 90 3.0 10.0 190 2.5 6.0 6.5 6.0 540 80 0.3 0.3 80 db db mvrms db % db db db db db db db mvrms db % % db db 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 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 sine wave 1khz 490mvrms sine wave 1khz 490mvrms sine wave 1khz 2vrms sine wave 1khz 490mvrms sine wave 1khz 490mvrms 0db = 49mvrms 20 log ('on level '/'off level') 20 log ('10k'/'1k') 20 log ('100%'/'0%') 0db = 147mvrms 20 log ('on level' /'off level') ext1 = '1' ext1 = '1' m1 = '0' ext1 = '1' ext1 = '1' ext1 = '1' ext1 = '1' vol-l = '0' vol-r = '0' 15klpf 15klpf 15klpf 15klpf 15klpf 15klpf 1kbpf 15klpf 15klpf 15klpf 1kbpf bus return 20 20 20 20 bus return 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 item symbol mode input pin input signal measurement conditions filter output pin min. typ. max. unit no.
12 CXA2174s gnd v cc v2 9v gnd gnd r8 62k metal 1% signal generator v1 ac c10 5600p r6 1meg r4 100k c11 0.012 c7 4.7 dgnd i 2 c bus data r3 220 r1 220 lsout-r 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 lsout-l sda scl dgnd mainin mainout pcint1 pcint2 plint compin vgr iref gnd saptc aux-l aux-r vcawgt vcatc vcain veout vetc vewgt ve sapin sapout noisetc stin subout v cc c1 4.7 c3 4.7 c15 4.7 c16 10 c13 1 c19 4.7 c6 4.7 c20 100 c14 4.7 c18 4.7 c17 4.7 c12 2700p r7 3.3k c9 0.047 r5 3k c8 3.3 tantalum c4 1 r2 3.9k c5 10 c2 4.7 tantalum v3 ac c5 4.7 v4 ac s1 s2 s3 s4 buff filters 15khz lpf f h bpf 1khz bpf measures signal generator signal generator electrical characteristics measurement circuit
13 CXA2174s adjustment method 1. att adjustment 1) test bit is set to test1 = 0 and test-da = 0 . 2) input a 100hz, 245mvrms sine wave signal to compin and monitor the lsout-l output level. then, adjust the att data for att adjustment so that the lsout-l output goes to the standard value (490mvrms). 3) adjustment range: 20% adjustment bits: 4 bits 2. separation adjustment 1) test bit is set to test1 = 0 and test-da = 0 . 2) set the unit to stereo mode and input the left channel only signal (modulation factor 30%, frequency 300hz nr-on) to compin. at this time, adjust the wideband adjustment data to reduce lsout-r output to the minimum. 3) next, set the frequency only of the input signal to 3khz and adjust the spectral adjustment data to reduce lsout-r output to the minimum. 4) the adjustments in 2 and 3 above are performed to optimize the separation. 5) wideband spectral adjustment range: 30% adjustment range: 15% adjustment bits: 6 bits adjustment bits: 6 bits ? adjust this ic through tuner and if when this ic is mounted in the set.
14 CXA2174s spectral wideband ???? 0000 ???? 0001 ???? 0010 ???? 0011 ???? 0100 ???? 0101 ? ? ? ? ? ? slave receiver 84h (1000 0100) slave transmitter 85h (1000 0101) register specifications slave address register table status registers data sub address msb lsb bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 test-da ext1 test1 ? nrsw vol-l vol-r fomo sapc m1 sta1 bit7 power on reset sta2 bit6 stereo sta3 bit5 sap sta4 bit4 noise sta5 bit3 sta6 bit2 sta7 bit1 sta8 bit0 att ? : don't care note) the micro computer reads both sap and noise status and judges sap discrimination.
15 CXA2174s description of registers control registers att spectral wideband test-da test1 ext1 nrsw fomo m1 sapc vol-l vol-r input level adjustment adjustment of stereo separation (3khz) adjustment of stereo separation (300hz) dac test mode test mode selection of tv mode or external input mode selection of the output signal (stereo mode, sap mode) forced mono (left channel only is mono during sap output.) selection of lsout mute function on/off (0: mute on, 1: mute off) selection sap mode or l + r mode according to the presence of sap brodecasting left channel volume control right channel volume control register contents 4 6 6 1 1 1 1 1 1 1 1 1 a a a t t u u u u s u u 9 1f 1f 0 0 0 0 0 1 0 3f 3f number of bits classifi- cation ? 1 standard setting ? 1 classification u: user control a: adjustment s: proper to set t: test status registers 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 register number of bits contents
16 CXA2174s description of control registers att (4): perform input level adjustment. 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 output are present at pin 2. lsout-l (pin 2): da control dc level test1 (1): monitor sapbpf and nrbpf output 0 = normal mode 1 = sapbpf, nrbpf output in addition, the following outputs are present at pins 1 and 2. lsout-l (pin 2): sap bpf out lsout-r (pin 1): nr bpf out ext1 (1): select tv mode or external input mode 0 = tv mode 1 = external input mode 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 m1 (1): mute the lsout-l and lsout-r output. 0 = mute on 1 = mute off
17 CXA2174s 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 vol-l (6): lsout-l output signal level control 0 = volume min. 3f = volume max. 1.25db/step vol-r (6): lsout-r output signal level control 0 = volume min. 3f = volume max. 1.25db/step
18 CXA2174s description of mode control nrsw fomo sapc m1 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) mode control sapc = 0 sapc = 1 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. mute m1 = 0: lsout output is muted.
19 CXA2174s decoder output and mode control table 1 (sapc = 1) input signal mode mode detection mode control dbx input output st sap noise nrsw fomo sapc lch rch ? 1 ? 1 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 outputted. "noise" status rises earlier than "sap" status when the amount of noise is increased to compin. 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 stereo mono & sap stereo & sap
20 CXA2174s decoder output and mode control table 2 (sapc = 0) input signal mode mode detection mode control dbx input output st sap noise nrsw fomo sapc lch rch ? 1 ? 1 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 outputted. "noise" status rises earlier than "sap" status when the amount of noise is increased to compin. mono stereo mono & sap stereo & sap 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)
21 CXA2174s 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 peak dev khz 50 25 25 l + r 50 15khz l-r dbx-tv nr 50 am-dsb-sc sap dbx-tv nr fm 10khz 50 10khz telemetry fm 3khz 15 f h = 15.734khz f h 2f h 3f h 4f h 5f h 6f h 6.5f h f 5 pilot 3 (compin) stereo lpf pll (vco 8f h ) 2f hl 0 f hl 90 f hl 0 mode control pilot det mvca pilot cancel main lpf de.em (main out) l + r 4.7 (main in) l-r (dsb) det inj. lock subvca sub lpf wideband (subout) (st in) 4.7 nr sw dbx-tv block matrix (lch) (rch) mode control (sap in) 4.7 sap (fm) det sap lpf mode control sap bpf (sap out) l r to tvsw noise det i c bus decoder 2 sap det a b i c bus decoder 2 i c bus decoder 2 11 7 6 17 18 20 21 nr sw fixed deemphasis variable deemphasis (ve out) (vca in) to matrix 4.7 hpf lpf lpf rms det rms det vca a b (st in) (sap in) 18 21 25 26
22 CXA2174s (1) l + r (main) after the audio multiplexing signal input from compin (pin 11) 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 20 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 18) or sap in (pin 21) 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. (6) matrix, tvsw 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 mode control and whether there is st / sap discrimination. tvsw switches the matrix output signal and external input signal. (7) 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 13) with gnd become the reference current.
23 CXA2174s application circuit gnd 62k metal 1% 5600p 1meg 100k 0.012 4.7 dgnd 220 220 lsout-r 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 lsout-l sda scl dgnd mainin mainout pcint1 pcint2 plint compin vgr iref gnd saptc aux-l aux-r vcawgt vcatc vcain veout vetc vewgt ve sapin sapout noisetc stin subout v cc 4.7 4.7 4.7 10 1 4.7 4.7 100 4.7 4.7 4.7 2700p 3.3k 0.047 3k 3.3 tantalum 1 3.9k 10 4.7 tantalum 4.7 +9v ls output -com composite baseband signal input aux input 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 .
24 CXA2174s i 2 c bus block items (sda, scl) 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 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 3) 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 sda scl t buf p s t hd : sta t low t hd : dat t high t r t f t hd : sta t su : sta sr t su : sto p t su : dat no. item symbol min. typ. max. unit
25 CXA2174s 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. sda scl start condition s stop condition p hlhi-zl
26 CXA2174s i 2 c data write (write from i 2 c controller to the ic) ? data can be transferred in 8-bit units to be set as required. sub address is incremented automatically. i 2 c data read (read from the ic to i 2 c controller) read timing ? data read is performed during scl rise. s address 1 67891 89 scl ack data ack sda h during read hi-z 7 p data 1 2 34 5 678 9 9 ic output sda scl msb lsb ack ack read timing ack ack data data p 891 89 hi-z hi-z data (n) data (n+1) ack 189189 ack data (n + 2) hi-z hi-z lsb msb s address 1 234567891 89 sda scl msb l during write msb lsb hi-z hi-z ack sub address ack
27 CXA2174s input level vs. distortion characteristics 1 (mono) distortion [%] 1.0 0.1 10 0 10 input level vs. distortion characteristics 2 (stereo) distortion [%] 10 1.0 10 0 10 input level [db] input signal: stereo l = r (dbx-tvnr on), 1khz 0db = 100% modulation level v cc = 9v, 30khz using lpf, st mode measurement point: lsout-l/r input level vs. distortion characteristics 3 (sap) distortion [%] 10 1.0 10 0 10 input level [db] input level [db] standard level (100%) standard level (100%) input signal: sap (dbx-tvnr on) 1khz, 0db = 100% modulation level v cc = 9v, 30khz using lpf, sap mode measurement point: lsout-l/r standard level (100%) input signal: mono (pre-emphasis on), 1khz 0db = 100% modulation level v cc = 9v, 30khz using lpf measurement point: lsout-l/r
28 CXA2174s frequency [khz] gain [db] stereo lpf frequency characteristics 10 5 0 5 10 0 20406080100 30 10 0 20 50 12 5 102050 770100 40 30 10 20 gain (fc main and fc sub) [db] frequency [khz] main lpf and sub lpf frequency characteristics 10 0 20 20 40 60 80 100 120 10 20 sap frequency characteristics and group delay group delay [s] 100 90 80 70 60 50 40 10 20 0 30 5f h gain group delay 3.8f h 6.2f h frequency [khz] gain [db] 0f 1f control data vol-l, vol-r 2f 3f 0 20 40 60 80 100 lsout output level [db] volume charactiristics input: auxin (pins 29, 30) 1khz, 490mvrms output: lsout (pins 1, 2)
29 CXA2174s package outline unit: mm sony code eiaj code jedec code 30pin sdip (plastic) 26.9 ?0.1 + 0.4 15 16 30 1.778 10.16 8.5 ?0.1 + 0.3 0.25 ?0.05 + 0.1 0? to 15? 0.5 0.1 0.9 0.15 3.0 min 0.5 min 3.7 ?0.1 + 0.4 sdip-30p-01 p-sdip30-8.5x26.9-1.778 1 package structure molding compound lead treatment lead material package mass epoxy resin copper alloy 1.8g palladium plating 1.all mat surface type. two kinds of package surface: 2.all mirror surface type. sony corporation

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