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? e93y13-te absolute maximum ratings (ta=25?) supply voltage v cc 12 v operating temperature topr ?0 to +85 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d 430 mw recommended operating conditions supply voltage v cc 7.8 to 11 v description the CXA1911Q is an ic designed for use in car stereo cassette decks. functions include dolby b/c type noise reduction, playback equalizer amplifier and music sensor into a single chip. features few external parts forward/reverse head switching small package (40-pin qfp) dolby b/c type noise reduction and playback equalizer into a single chip same pin configuration as dolby b type noise reduction system (cxa1910q) music sense level can be set by external resistors/capacitors (2 modes). high-band cut filter frequency can be adjusted by the external capacitance. applications car stereo cassette decks cassette decks (playback only) structure bipolar silicon monolithic ic dolby b/c type noise reduction system with playback equalizer 40 pin qfp (plastic) CXA1911Q * these ics are available only to the licensees of dolby laboratories licensing corporation from whom licensing and applications information may be obtained. * "dolby" and the double d symbols are trade marks of dolby laboratories licensing corporation. * sony reserves the right to change products and specifications without prior notice. this information does not convey any license by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustrating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits.
? CXA1911Q block diagram nc tapesw drsw nrmode mssw msmode g1 (ff) g2 (nor) mstc msout msgnd tch2 tcl2 lineout2 d iref mslpf nc tapein2 vcc pbout2 nrsw tch1 tcl1 lineout1 vct nc nc tapein1 gnd pbout1 pbtc1 pbfb1 pbrin1 pbfin1 pbgnd e iref pbfin2 pbrin2 pbfb2 pbtc2 300k 300k 10db lp f de t ams mode nr dr ta pe in g1/g2 22 21 23 24 25 26 27 28 29 30 20 19 18 17 16 15 14 13 12 1 2 3 4 5 6 7 8 9 10 11 31 32 33 34 35 36 37 38 39 40 f/r f/r nr nr
? CXA1911Q pin symbol dc z (in) equivalent circuit description no. value refer to page 7. 147 v cc gnd 100k 5 64p 12a 147 vgs 28 3 40k 1 pbout 2.1v 30 32 pbfb 2.1v 300k 39 33 pbin 0v 34 37 38 2v cc 8.0v 3 tapein 4.0v 40k 28 4nc 20 26 27 5 mslpf 4.0 100k pbeq output pbeq feedback pbeq input power supply tape input no connection adjustment of ms lpf frequency pin description (ta=25?, v cc =8.0v, no signal)
? CXA1911Q pin symbol dc z (in) equivalent circuit description no. value 6 d iref 1.25v 7 lineout 4.0v 24 8 tcl 0.3v 23 9 tch 0.3v 22 10 msgnd 0.0v 29 gnd 35 pbgnd connection of reference current setting resistor for dolby block line output time constant pin for the lls time constant pin for the hls ground 480k 23 8 147 13.5k 330k 22 9 147 36k 147 50k 6 147 v cc gnd 200 200 7 24
? CXA1911Q pin symbol dc z (in) equivalent circuit description no. value 11 msout 0.2 v for signal detection; 5.0 v for no signal detection 12 mstc approx. 1.4 v for signal detection; 5.0 v for no signal detection 13 g2(nor) 4.0v 14 g1(ff) 15 msmode 18 drsw 19 tapesw 21 nrsw 16 mssw ms output connection of ms detection time constant ms feedback msmode ms gain selector g1 when high, g2 when low drsw head selector reverse when high, forwards when low tapesw equalizer selector 120? when high, 70? when low nrsw nr on/off selector ms on/off selector ms on when high, ms off when low 147 vcc gnd 1k 50 v dd =5v 12 147 v cc gnd 20k v dd =5v 11 100k 147 v cc gnd 100 10 14 13 147 21 19 18 15 50 50 147 v cc gnd 50 50 16
? CXA1911Q pin symbol dc z (in) equivalent circuit description no. value 17 nrmode 25 vct 4.0v 31 pbtc 40 36 e iref 1.25v noise reduction selector c when high, b when low v cc /2 output pbeq capacitance connection of reference current setting resistor for pbeq block 147 50 50 50k 2.5v 17 147 45k 30k 25 30k q3 to vgs 147 10 1.25v v cc gnd 36 147 42 30 v cc gnd 31 40
? CXA1911Q pbout, pbfb, pbin equivalent circuit pbout pbfb pbin 147 600 vcc v reg gnd 10p 300k 30 32 33 34 37 38 1 39 electrical characteristics (ta=25?, v cc =8.0 v, rl: output load resistance, rg: head equivalent impedance; unless otherwise specified, 120 ?, fwd mode, nr off, ms off) item symbol measurement conditions min. typ. max. unit (input pin, input level frequency etc.) operating voltage current consumption tape in input sensitivity nr b decode boost 1 nr b decode boost 2 nr b decode boost 3 nr b decode boost 4 nr b decode boost 5 nr c decode boost 1 nr c decode boost 2 nr c decode boost 3 nr c decode boost 4 nr c decode boost 5 nr c decode boost 6 7.8 8.0 11.0 v 18.5 21.9 25.5 ma ?2.0 ?0.0 ?8.0 dbm 1.4 3.4 4.4 5.5 6.0 8.5 3.9 5.1 6.9 db 9.7 10.2 11.9 ?.1 0 1.9 14.2 16.5 18.2 7.2 9.8 11.2 18.7 20.9 22.7 db 5.4 7.3 9.4 3.5 5.7 7.5 ?.5 ?.9 ?.5 vopr i cc v tin bp1 bp2 bp3 bp4 bp5 cp1 cp2 cp3 cp4 cp5 cp6 no signal line out=0db 1khz 500hz, line out ?5db, nr b, tape in 2khz, line out ?5db, nr b, tape in 5khz, line out ?5db, nr b, tape in 10khz, line out ?0db, nr b, tape in 10khz, line out 0db, nr b, tape in 500hz, line out ?0db, nr c, tape in 500hz, line out ?5db, nr c, tape in 2khz, line out ?0db, nr c, tape in 2khz, line out ?5db, nr c, tape in 5khz, line out ?5db, nr c, tape in 10khz, line out 0db nr c, tapein dolby block (dolby level -6 dbm=0 db)
? CXA1911Q 0.01 0.2 0.04 0.2 % 0.07 0.3 77.0 84.0 db 80.0 82.0 13.5 14.4 db ?1 ?5 3.9 4.0 4.1 v 70 100 mv ?7.0 ?5.5 ?3.0 dbm ?.5 ?.8 1.5 db ?.5 ?.0 1.5 db ?.0 ?.3 1.0 ?0.0 ?.0 dbm 0.11 0.5 % 57.0 61.1 db 1.55 1.95 2.35 v ?0.5 ?0 db ?7.7 ?5 ?3.0 ?9.0 ?5.0 dbm ?2.5 ?8.5 ?4.5 0.0 1.0 ? 0.3 1.0 v 0.0 0.8 v 2.5 v cc 1.0 3.0 ma 3.4 v 3.6 tape in total harmonic distortion 1 tape in total harmonic distortion 2 tape in total harmonic distortion 3 decode s/n ratio signal handling cross talk tape in 1 ch ? 2 ch line out offset voltage b/c switching noise playback equalizer amplifier block 120 ? fwd frequency response 70 ? fwd frequency response signal handling total harmonic distortion s/n ratio output offset voltage cross talk between channels cross talk between rvs and fwd signal detection level 1 signal detection level 2 ms output leak current ms output saturation voltage logic voltage 2-value input boost charge circuit block pbfb boost charge current boost charge on vct level boost charge off vct level interval detection between tracks (music sensor) block thd1 thd2 thd3 sn1 sn2 v sh 1 ct3 v os 1 vb otu pbref f120f f70f f120r v sh 2 thd6 sn3 v os 2 ct4 ct5 v ms 1 v ms 2 i oh v ol v il v ih i crg v crg1 v crg2 tape in ?0dbm 1khz r1=2.7k tape in ?0dbm 1khz nr b r1=2.7k tape in ?0dbm 1khz nr c r1=2.7k no signal nr b ccir/arm filter no signal nr c ccir/arm filter tape in 1khz rl=2.7k thd=1% tape in ?4dbm 1khz no signal level at pb in to line out, line out pb f in 315hz ?0dbm vpbo=0db pb f in 2.7 khz -58.5 dbm for 315 hz pb f in 4.5 khz -53.8 dbm for 315 hz pb r in 315 hz -70 dbm for 315 hz pb f in 1khz thd=1% rl=2.7k pb f in 1khz ?2dbm rl=2.7k no signal "a" weighting filter on no signal rg=2.2 k tape in 1khz ?2dbm tape in 5 khz ams on (g1 mode) external constant 10 k , 0.015 ? tape in 5 khz ams on (g2 mode) external constant 1 k , 1.5 ? tape in 5 khz -10 dbm, 5 v applied to amsout tape in 5 khz -30 dbm, 1 ma applied to amsout nrsw, tapesw, drsw, nrmode, mssw, msmode no signal, 3.4 v applied to vct and 1.8 v to pbfb no signal, vct level when boost charge on no signal, vct level when boost charge off electrical characteristics item symbol measurement conditions min. typ. max. unit (input pin, input level frequency etc.)
? CXA1911Q electrical characteristics measurement circuit 24 23 22 21 20 19 18 17 16 1 5 14 9 11 12 13 8 7 6 5 4 3 2 1 31 30 29 28 32 33 34 35 36 37 38 39 40 25 10 nc tapesw drsw nrmode mssw msmode g1 g2 mstc msout msgnd tch2 tcl2 lineout2 d iref mslpf nc tapein2 vcc pbout2 nrsw tch1 tcl1 lineout1 vct nc nc tapein1 gnd pbout1 pbtc1 pbfb1 pbrin1 pbfin1 pbgnd e iref pbfin2 pbrin2 pbfb2 pbtc2 27 26 68n c21 0.1 c23 r29 2.7k 2.2 c19 r28 20k 150p c16 s8 5.1k r18 138.5k r16 c12 1 c11 10 c9 10 r33 1meg 0.1 c25 r39 r38 s20 s21 r37 s22 r36 s23 r35 s24 r34 s25 10k 100 100 10k 100 10k c26 1.5 r31 1k r32 10k c27 0.015 v1 v2 v3 v5 v7 0.1 c24 68n c22 c29 10 c18 1 c13 5.1k r17 138.5k r19 1 c10 s5 s6 2.7k r11 2.7k r14 270 r12 270 r13 33 c2 10n c8 s1 s2 2.2k r10 c6 2.2k r9 4.7 c5 2.2k r8 4.7 c4 r15 s4 2.2k r7 4.7 c3 s3 33 c1 10n c7 15k audio sg gnd r1 1.2k 1.2k r2 power supply vcc dc ammeter r6 19.2k r5 19.2k r4 19.2k r3 19.2k r43 s16 r42 s17 r41 s18 r40 s19 10k 10k 100 100 oscillo -scope distortion analyzer ac voltmeter ccir 1khz bpf din audio "a" wtg dc voltmeter amp gnd gnd off : 0db on : 30db r44 50k s26 0db or 30db s28 s29 s30 s31 s32 s14 s15 s13 2.7k 22 s7 4.7 a v4 r45 100k gnd g1 r30
?0 CXA1911Q operating modes (tapesw, drsw, nrsw, mssw, modesw, nrmode) the CXA1911Q has an nr switch (nrsw), nr mode switch (nrmode), equalizer switch (tapesw), head switch (drsw), ms switch (mssw), and ms gain switch (msmode). the operating modes for each switch are shown in the following table. click noise can be reduced by the external cr time constant for nrsw switching. sw function for low input function for high input nrsw nr off nr (b/c) on nrmode dolby b dolby c tapesw 70? 120? drsw pb fwd pb rvs mssw ms off ms on msmode g2 mode g1 mode
?1 CXA1911Q description of operation 1. signal route fig. 1 op1 and op2 are operational amplifiers. op1 composes the playback equalizer by attaching a resistor and a capacitor to pbfb pin, and a capacitor to pbtc pin. op2 is an input selector and a lineout amplifier. the gain is 24 db. the dolby reference level is ? dbm (lineout). the adjustment method of playback equalizer is described in the paragraph (3). note) usually the tapein pin level is adjusted by attenuator connected to pbout pin. the capacitance value connected to pbfb can be reduced by adjusting the resistance connected to pbfb to match the pbout level. with this method, the capacitance value can be reduced according to the amount that the resistance value is increased even for the same cut-off frequency. (these specifications use the latter method.) op2 4db 20db 20db nr off nr on op1 pbfb pbtc pbout tapein dolby level (?dbm) lineout pbin f r nr
?2 CXA1911Q 2. level diagram fig.2 note) this diagram illustrates the case where the dolby level is aligned by adjusting the resistance value connected to pbfb. ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 ?0 ?5 p b i n vr adjustment ?0dbm ?0dbm ?dbm dolby level ?0dbm (315hz 160nw b/m) ? p b o u t t a p e i n l i n e o u t 0db
?3 CXA1911Q 3. pbeq adjustment 1) eq curve gain difference (=adjustment of internal variable r) ? iref resistor to adjust the eq curve gain differences (g1 ?g2, g1 ?g3), the e iref resistor should be adjusted to change the internal variable resistance value. 2) ac gain ? external resistor r1 the external resistor r1 should be adjusted to adjust the ac gain. g1 is obtained by the following equation. g1=20log r1 + r3 (r3 = 300k ) r1 3) low-band cut-off frequency ? external resistor r1 and capacitor c1 the low-band cut-off frequency (fc) can be determined by the external resistor r1 and external capacitor c1. note) in this diagram, c1 and r1 are not connected in series, but are connected to pbfb from between r1 and c2. this is to prevent the sound quality from deteriorating when using an electrolytic capacitor. r1 c2 c1 pbfb pbtc pbout e iref r4 1 pbin fr ri 3 2 1 fc 2 3 r3 3
?4 CXA1911Q 4. ms (internal detection between tracks) adjustment method 1) ms gain (ff/nor mode gain) adjustment ? external resistors r1 and r2 ms gain is expressed by the following equations. g1 = 10 + 20log r1 + 100k [db] g2 = 10 + 20log r2 + 100k [db] r1 r2 2) ms low-band cut-off frequency adjustment ? external resistors r1 and r2 and external capacitors c1 and c2 the external resistors r1 and r2 and external capacitors c1 and c2 should be adjusted to adjust the low- band cut-off frequency for the ms frequency response. 3) ms high-band cut-off frequency adjustment ? external capacitor c3 the external capacitor c3 should be adjusted to adjust the high-band cut-off frequency for the ms frequency response. (in this case, g1 and g2 have the same cut-off frequency.) det g2 g1 msout tapein 10db 25khz lpf (in the case of built-in only) 100k w g1 g2 r1 r2 c1 c2 2 1 mstc 2 1 2 1 2 1 100k w 64pf 3 3 mslpf c3
?5 CXA1911Q 20 16 12 8 4 0 c typ e decode characteristics decode boost [db] 24 ?0db ?0db ?0db ?0db 0db 50 100 1k 10k frequency [hz] 500 5k ? ta=25c ?0db ?0db v cc =8.0v 0db=dolby level 10 8 6 4 2 0 b typ e decode characteristics decode boost [db] 12 ?0db ?0db ?0db ?0db 0db 50 100 1k 10k frequency [hz] 500 5k v cc =8.0v 0db=dolby level out 300k 0.01 33 270 supply voltage [v] 7.0 8.0 9.0 10.0 11.0 12.0 current consumption [ma] c urre nt co nsump tio n vs. sup p ly vo ltag e 50 100 1k playb ack equalizer frequency resp onse gain [db] frequency [hz] 60 50 40 30 v cc =8.0v nr off, ms off output level 25dbm constant 120 s 70 s ta=25c ta=25c 6.0 5.0 13.0 10k 20.5 21.0 21.5 22.0 for no signal nr off, ms off characteristics graphs
?6 CXA1911Q c typ e total harmonic distortion ta=25c 10 0 10 1 total harmonic distortion [%] 10 -1 10 -2 nr c f=10khz nr c f=100khz nr c f=1khz ? ? 0 4 8 12 total harmonic distortion (p re-amp lifier b lock) total harmonic distortion [%] output level [dbm] ?4 ?0 ?6 ?2 ? ? 0 10 0 10 1 10 -1 ta=25c f=10khz f=1khz f=100hz 10 -2 10 -1 b typ e total harmonic distortion ta=25c 10 0 ? ? 0 4 8 12 14 nr off f=1khz nr b f=100khz nr b f=1khz nr b f=10khz total harmonic distortion [%] output level [db] ta=25c ?0 ?0 ?0 ?0 ?0 ?0 50 100 1k 10k 500 5k r ip p le rejection ratio (pb o u t) frequency [hz] ripple elimination ratio [db] output level [db] v cc =8.0v input : pbfin1 output : pbout1 r l =2.7k w input : t apein1 output : lineout1 v cc =8.0v 0db=dolby level r l =2.7k w input : t apein1 output : lineout1 v cc =8.0v 0db=dolby level r l =2.7k w vcc=8.0v rl=2.7k w
?7 CXA1911Q ?0 ?0 ?0 ?0 ?0 10 20 30 40 50 60 ms b lock gain vs. blank detection level input level [dbm] hpf gain [db] v cc =8.0v input : t apein1 f=1khz ta=25c 0 ?0 ?0 ?0 ?0 ?0 ?0 20 100 1k 10k blank detection level frequency resp onse frequency [hz] ta = 25c hpf gain 20 db hpf gain 40 db input level [dbm] v cc = 8.0 v input : t apein 1 mslpf pin: t120 pf c ro ss talk b e twe e n channe ls (1ch ? 2ch) cross talk [db] frequency [hz] ?0 1k 100 5k ?0 ?0 ?0 ?0 ta=25 c vcc=8.0v input : pbfin1 output : lineout2 (lineout1 level constant) nr off 500 10k ?0 ?0 ?0 ?0 ?0 ?0 ?0 ta=25c 1k 100 10k 500 5k nr b nr c r ip p ler rejection ratio (lin eo u t) ripple elimination ratio [db] frequency [hz] nr off v cc =8.0v r l =2.7k w
sony code eiaj code jedec code package material lead treatment lead material package weight epoxy resin solder / palladium copper / 42 alloy package structure plating 0.2g qfp-40p-l01 * qfp040-p-0707 40pin qfp (plastic) 9.0 0.4 + 0.4 0.3 ?0.1 0.65 1 10 11 20 21 30 31 40 1.5 ?0.15 + 0.35 0.127 ?0.05 + 0.1 (8.0) a a detail 0.1 ?0.1 + 0.15 + 0.15 7.0 ?0.1 0.5 0.2 0.1 m 0.12 package outline unit : mm CXA1911Q ?8

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