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description the cxa1498s/m is a bipolar ic designed as equalizer amplifier for tape redorder recording/ playback. this ic is particularly well-suited for double cassette deck applications. an on-chip filter serves to greatly reduce the number of external parts. features recording equalizer amplifier 2 (monolithic filter eliminates the need for external resonance circuit) agc (automatic gain control) 2 playback equalizer amplifier 2 (variable resistor eliminates the need for external feedback resistor) electronic switch for playback head (changes between a and b decks) electronic switch for tape equalization (120s/70s) (independently for a and b decks) electronic switch for metal tapes electronic switch for normal/high speed dubbing (effective for both rec eq and pb eq) recording mute function (soft mute is possible through use of an external time constant circuit) dc controllable for fade in/out (controls recording mute function) playback mixing output pin provided (for tune selection) use of this ic simplifies the construction of double cassette dubbing system block diagram and pin configuration (top view) applications recording/playback equalizer amplifier, playback mixing amplifier and agc for analog stereo tape recorders structure bipolar silicon monolithic ic absolute maximum ratings (ta = 25?) supply voltage v cc 12 v operating temperature topr ?0 to +75 ? storage temperature tstg ?5 to +150 ? allowable power dissipation p d sdip 930 mw sop 630 mw recommended operating condition supply voltage v cc 4.5 to 10.0 v ?1 cxa1498s/m e91860c49-st recording/playback equalizer amplifier for stereo tape recorder 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. cxa1498s 30 pin sdip (plastic) cxa1498m 30 pin sop (plastic) rec eq control pb in1 (l) pb in2 (l) pb fb1 (l) pb fb2 (l) pb out (l) ms out i ref speed deck b eq metal agc tc agc (l) rec in (l) gnd rec out (l) pb in1 (r) pb in2 (r) pb fb1 (r) pb fb2 (r) pb out (r) rfs rfc deck a/b deck a eq rec mute vg agc (r) rec in (r) v cc rec out (r) pb eq control mute cont rec eq rec eq pb fb1 pb fb2 100k 210k deck a/b deck- a deck- b pb in2 pb in1 pb out deck a/b 210k 100k pb fb1 pb fb2 pb in2 pb in1 deck- a deck- b i ref speed deck -b eq metal agc gnd rec out rfs rfc deck a/b deck -a eq rec mute vg agc rec in v cc rec out ms out pb out agc tc rec in bias & i ref 30k 30k agc det vgs v cc gnd 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 pb pb
?2 cxa1498s/m pin description and equivalent circuit (ta = 25?, v cc = 8v, no signal) pin no. symbol dc voltage i/o i/o resistance equivalent circuit description 1 2 29 30 pbin1 l pbin2 l pbin2 r pbin1 r 0v * 1 i playback equalizer amplifier input pins. 29 30 1 v cc rfs 147 2 6 6 gnd 2 4 27 pbfb2 l pbfb2 r 2.5v * 1 connection pins for the capacitor that determines the playback equalizer amplifier's time constant (120s, 70s, etc.) 4 27 v cc rfs 147 5 5 gnd 7k 6 ms out 2.5v * 1 o 147 mixed output pin for the l and r outputs of the playback equalizer amplifier. v cc 147 gnd 4 500 5k 2 500 v cc 6 3 28 pbfb1 l pbfb1 r 0.8v * 1 68k playback equalizer amplifier negative feedback pins. 5 26 pbout l pbout r 2.5v * 1 o 147 playback equalizer amplifier output pins. 5 26 28 v cc rfs 147 6 6 gnd v cc 26 6 4 v cc 3 5 7k 147 10k 100k 10k 210k 500 500 3 5 to 10p 10p
?3 cxa1498s/m 7 i ref 1.2v recording/playback equalizer reference current setting pin. v cc 147 gnd 2 v cc 7 gnd 5p 11 agc tc 0v connection pin for the resistance and capacitor that determines the agc attack recovery time constant. 11 v cc 147 gnd 200 2 v cc 2 500 500 100k 2 200 4 8 speed 9 b eq 10 metal 22 a eq 23 deck ab ? tape speed switching pin. high: high speed low: normal speed b deck equalizer switching pin. high: 70s eq low: 120s eq b deck metal tape switching pin. high: metal tape low: normal or cro 2 tape a deck equalizer switching pin. high: 70s eq low: 120s eq a deck/b deck playback switching pin. high: pbin2 low: pbin1 8 9 10 22 23 v cc 147 gnd v cc pin no. symbol dc voltage i/o i/o resistance equivalent circuit description
?4 cxa1498s/m 12 19 agc_l agc_r 4v i/o 100k agc pins for varying the input resistance according to the input signal level over a range from 100k to several 10 . 12 19 v cc gnd 4 v cc vgs 200 100k 5k 200 10k 13 18 recin l recin r 4v i 50k recording equalizer amplifier input pins. 13 18 v cc gnd vgs 1.8k 5p 147 v cc 24k 50k 15 16 recout l recout r 4v o 147 recording equalizer amplifier output pins. 16 5p v cc 147 gnd 10 500 3 500 v cc 40k vg 15 20 vg 4v 15k connection pin for the capacitor that eliminates ripple at the signal reference voltage. to each vgs 3p v cc 147 gnd v cc 30k 20 4 500 2 500 30k 14 gnd 0v ground pin. gnd 14 17 v cc 8v power supply voltage pin. v cc 17 pin no. symbol dc voltage i/o i/o resistance equivalent circuit description
?5 cxa1498s/m 21 mute i recording mute control pin. permits soft mute by connecting an external cr time constant circuit. v cc 147 3 3 gnd 20k 20k v cc 2v 21 24 rfc 8v * 2 connection pin for the resistance and capacitor used for generating stable voltage by eliminating ripple from the power supply voltage. 25 rfs 7.2v * 2 o stable voltage output pin. v cc 147 gnd v cc 250 v cc to each rfs 24 25 * 1 the values of dc voltage require connection of bias resistance between gnd and pins 1, 2, 29 and 30, respectively. * 2 the values of dc voltage require connection of a resistance between pin 24 and v cc , and a capacitor between pin 24 and gnd for eliminating ripple, respectively. pin no. symbol dc voltage i/o i/o resistance equivalent circuit description
?6 cxa1498s/m electrical characteristics (ta = 25?, v cc = 8.0v) operating voltage current consumption reference input level reference output level s/n ratio (norm-norm) signal handling total harmonic distortion output offset voltage recording mute ratio recording mute characteristics agc level channel balance agc distortion vopr i cc vin vout sn (a-wtg) sh thd voff fnn-1 fnn-2 fnn-3 fcn-1 fcn-2 fcn-3 fmn-1 fmn-2 fmn-3 fnh-1 fnh-2 fnh-3 fch-1 fch-2 fch-3 fmh-1 fmh-2 fmh-3 mt-1 mt-2 agc-l agc-b thd-a single power supply norm/120s-norm, no signal norm-norm, 315hz norm-norm, 315hz rg = 5k , ??wtg filter r l = 2.7k , 1khz, thd = 1% r l = 2.7k , 1khz, 0db norm-norm 3khz, ?0db 8khz, ?0db 12khz, ?0db 3khz, ?0db 8khz, ?0db 12khz, ?0db 3khz, ?0db 8khz, ?0db 12khz, ?0db 5khz, ?0db 15khz, ?0db 20khz, ?0db 5khz, ?0db 15khz, ?0db 20khz, ?0db 5khz, ?0db 15khz, ?0db 20khz, ?0db norm-norm, 1khz, +8db norm-norm, 1khz, 2.0v (pin voltage) r in = 10k , 1khz, ?5dbm r in = 10k , 1khz, ?5dbm r in = 10k , 1khz, 0.0dbm 4.5 7.0 ?4.5 60.0 8.0 3.8 ?.6 2.4 6.4 3.4 6.1 9.4 3.2 5.1 7.6 ?.4 3.9 7.0 3.1 7.6 10.3 3.7 7.7 9.8 ?.0 ?1.0 ?.0 8.0 11.5 ?3.0 ?.0 63.5 10.0 0.19 4.13 ?.4 3.9 8.9 4.6 7.6 11.4 4.4 6.6 9.6 ?.2 5.7 9.5 4.3 9.4 12.8 4.9 9.2 12.3 ?5.0 ?.0 ?9.0 0.0 0.8 10.0 15.5 ?1.5 0.5 4.5 0.8 5.4 11.4 5.8 9.1 13.4 5.6 8.1 11.6 1.0 7.5 12.0 5.5 11.2 15.3 6.1 10.7 14.8 ?0.0 ?.0 ?7.0 2.0 1.5 v ma dbm dbm db db % v db db db db db db db db db db db db db db db db db db db db dbm db % item symbol unit min. typ. max. conditions * recording equalizer amplifier agc norm-norm mode frequency characteristics cro 2 -norm mode frequency characteristics metal-norm mode frequency characteristics norm-high mode frequency characteristics cro 2 -high mode frequency characteristics metal-high mode frequency characteristics for norm- norm at 315hz ?0db for norm- norm at 315hz ?0db for norm- norm at 315hz ?0db for norm- norm at 315hz ?0db for norm- norm at 315hz ?0db for norm- norm at 315hz ?0db
?7 cxa1498s/m 70s-norm frequency 120s-high frequency 70s-high frequency signal handling total harmonic distortion s/n ratio (120s-norm) output offset voltage dc feedback resistance input bias resistance mix output voltage ripple filter output current pb-ref f120-n f70-n f120-h f70-h sh thd sn (a-wtg) voff r fb r in v-mix rfio vch vcl 315hz, -70dbm, frequency characteristics standard (0db) for 2.7khz, ?8.5dbm, at 315hz for 4.5khz, ?3.8dbm, at 315hz for 5.3khz, ?2.5dbm, at 315hz for 9.1khz, ?7.8dbm, at 315hz r l = 2.7k , 1khz, thd = 1% r l = 2.7k , 1khz, ?2dbm rg = 2.2k , ??wtg filter 120s-norm, rg = 100k 120s-norm, 2.7khz, ?2dbm threshold voltage of mode control pin threshold voltage of mode control pin ?7.0 ?.5 ?.2 0.7 1.1 ?0.0 55.0 2.2 150 ?.5 10.0 2.5 gnd ?5.0 0.0 0.3 2.2 2.6 ?.0 0.19 60.0 2.5 210 0.3 0.0 ?3.0 1.5 1.8 3.7 4.1 0.5 2.8 270 1.0 1.5 v cc 1.0 dbm db db db db dbm % db v k ? db ma v v item symbol unit min. typ. max. conditions * playback equalizer amplifier 120s-norm mode frequency characteristics * norm-norm = normal tape, normal speed norm-high = normal tape, high speed cro 2 -norm = cro 2 tape, normal speed cro 2 -high = cro 2 tape, high speed metal-norm = metal tape, normal speed metal-high = metal tape, high speed 120s-norm = eq: 120s, normal speed 120s-high = eq: 120s, high speed 70s-norm = eq: 70s, normal speed 70s-high = eq: 70s, high speed control voltage ?igh? level control voltage ?ow? level
?8 cxa1498s/m electrical characteristics test circuit s2 s4 r3 2.2k r5 100k r7 680k c2 4.7/25v r9 100k s6 r13 2.2k r11 680k s8 c6 100 25v r15 180 c8 0.015 r1 620 gnd gnd power supply audio sg a dc ammeter dc 5v supply s10 r18 2.7k c10 4.7 25v s18 rec mute s14 deck a/b r44 10k c29 4.7 25v r48 2.7k s26 r52 100 s34 s35 r43 10k c28 4.7 25v r47 2.7k s33 s25 s32 r51 100 s45 amp din audio r54 50k gnd "a" wtg 1khz bpf distortion analyzer ac voltmeter oscillo -scope s41 s44 s43 s42 dc voltmeter r22 2.4k r19 2.4k r16 5.6k r33 6.2k r32 1.1k r29 3k s12 r21 470 r24 10k c12 100/25v r26 1k c14 1/25v r28 1k c16 1/25v r31 1k c18 1/25v c19 47/25v r36 10k c22 10/25v s20 r38 62k s22 r40 5.1k s24 c27 100/25v c26 2.2 25v pb in1 (l) pb in2 (l) pb fb1 (l) pb fb2 (l) pb out (l) ms out i ref speed deck-b eq metal agc tc agc (l) rec in (l) gnd rec out (l) pb in1 (r) pb in2 (r) pb fb1 (r) pb fb2 (r) pb out (r) rfs rfc deck a/b deck-a eq rec mute vg agc (r) rec in (r) v cc rec out (r) cxa1498s/m s15 deck b eq s17 metal s13 tape speed r50 100 s31 r42 10k r49 100 r41 10k s30 s29 s28 s27 s40 s39 s37 s36 r46 10k r53 100 r45 10k c25 2.2 25v r35 10k c23 4.7/25v r34 300k c20 10/25v r30 1k c17 1/25v r27 1k c15 1/25v r25 1k c13 1/25v c7 0.015 r2 2.2k s1 r4 100k s3 s5 s7 r6 680k c1 4.7/25v r8 100k r10 680k r12 2.2k r14 180 c5 100 25v c3 4.7/25v c4 4.7/25v c9 4.7 25v r17 2.7k s9 s11 r20 2.7k r23 27k c11 4.7 25v r37 62k r39 5.1k s21 s23 s19 c21 10/25v 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 noise filter s16 deck a eq 0db or 30db
?9 cxa1498s/m rec eq control pb eq control mute cont rec eq rec eq pb fb1 pb fb2 100k 210k deck a/b deck- a deck- b pb in2 pb in1 pb out deck a/b 210k 100k pb fb1 pb fb2 pb in2 pb in1 deck- a deck- b i ref speed deck -b eq metal agc gnd rec out rfs rfc deck a/b deck -a eq rec mute vg agc rec in v cc rec out ms out pb out agc tc rec in bias & i ref 30k 30k agc det vgs v cc gnd pb pb r12 10k c17 4.7 gnd gnd r16 5.6k c23 0.47 c21 2.2 r18 22k c15 47 r11 1m gnd gnd c13 4.7 r9 10k gnd c11 4.7 r7 10k gnd c9 4.7 r5 10k gnd gnd gnd r1 180 c3 0.015 c1 100 r3 27k c5 4.7 c7 4.7 gnd pb only head (deck-a) to dolby nr ic dolby nr ic (pb in) to ams speed deck-b eq metal (metal/metal) to dolby nr ic dolby nr ic (recin) line in from dolby nr ic dolby nr ic (rec out) c26 2.2 c28 820p c32 180p r20 10k c30 150p gnd l1 12mh rec pb rec/pb gnd rec/pb head (deck-b) r13 10k c18 4.7 gnd gnd r17 5.6k c24 0.47 c22 2.2 r19 22k gnd c14 4.7 r10 10k gnd c12 4.7 r8 10k gnd c10 4.7 r6 10k gnd gnd r2 180 c4 0.015 c2 100 c6 4.7 gnd pb only head (deck-a) to dolby nr ic dolby nr ic (pb in) filter out deck a/b deck-a eq rec mute to dolby nr ic dolby nr ic (rec in) line in from dolby nr ic dolby nr ic (recout) c27 2.2 c29 820p c33 180p r21 10k c31 150p gnd l2 12mh rec pb rec/pb gnd rec/pb head (deck-b) c8 100 r4 10k gnd c25 100 r15 22k c20 10 c16 47 v cc bias osc c19 10 r14 22k v cc 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. application circuit
?10 cxa1498s/m notes on operation (1) operation mode control (each mode of recording and playback equalizers) 1: playback equalizer switching (120s/70s) (pins 9, 22 and 23) 2: normal/double speed switching (pin 8) both playback and recording equalizers are switched in normal/double speed switching. * for double speed, both playback and recording systems are switched to double speed characteristics of each setting mode: (pb-eq: 120s, 70s) (rec-eq: normal, cro 2 , metal) 3: recording equalizer switching (normal, cro 2 , metal) (pins 9 and 10) (2) recording mute (rec mute: on/off) (pin 21) the recording mute function of the cxa1498s is controlled by a recording mute circuit to vary the electric volume for recording equalizer amplifier gain by applying the dc voltage to rec mute (pin 21). deck a-eq (pin 22) deck b-eq (pin 9) lh 120s (a-deck) 70s (a-deck) follows b-eq control. deck a/b (pin 23) l h lh follows a-eq control. 120s (b-deck) 70s (b-deck) recording mute on attenuation ?db 2.0v rec mute control voltage gnd vcl 0.5v recording mute off 3.5v vch v cc metal (pin 10) lh normal (type- i ) metal (type- iv ) cro 2 (type- ii ) metal (type- iv ) deck b-eq (pin 9) l h lh normal speed double speed normal speed double speed playback eq recording eq speed pin 8
?11 cxa1498s/m recording equalizer vs. frequency characteristics (normal speed) freq [khz] response [db] 0.125 1.0 10 50 ? 0 5 10 15 20 25 metal-ns cro 2 -ns norm-ns 0db = norm-ns mode 315hz, ?5dbm at rec out recording equalizer vs. frequency characteristics (double speed) freq [khz] response [db] 0.125 1.0 10 50 ? 0 5 10 15 20 25 metal-hs cro 2 -hs norm-hs 0db = norm-ns mode 315hz, ?5dbm at rec out playback equalizer vs. frequency characteristics freq [khz] gain [db] 0.050 0.1 10 20 20 5 db/ 60 1.0 120s-ns 120s-hs 70s-ns 70s-hs
?12 cxa1498s/m agc output voltage characteristics input level [dbm] output level [dbm] ?5 ?0 ?5 ?0 ?5 ?0 ? 0 5 ?5 ?0 ?0 ?5 ?0 ?5 agc off agc on agc total harmonic distortion input level [dbm] ?5 ?0 ?5 ?0 ?5 ?0 ? 0 5 0.01 0.1 1.0 t. h. d + n [%]
?13 cxa1498s/m package outline unit: mm cxa1498s cxa1498m sony code eiaj code jedec code package structure molding compound lead treatment lead material package weight epoxy / phenol resin solder plating copper alloy 30pin sdip (plastic) 400mil 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 sdip030-p-0400-a 1.8g 1 30pin sop (plastic) 375mil 0.45 0.1 1 15 16 30 10.3 0.4 0.5 0.2 1.27 0?to 10 m 0.12 9.3 a 18.8 + 0.4 ?0.1 0.10 7.6 + 0.3 ?0.1 0.2 + 0.1 ?0.05 2.3 + 0.4 ?0.05 0.1 0.1 sony code eiaj code jedec code package structure package material lead treatment lead material package weight epoxy resin solder plating copper / 42 alloy sop-30p-l03 * sop030-p-0375-c 0.7g detail a

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