dual eq amp with alc S1A2224A01 1 introduction the S1A2224A01 is a monolithic integrated circuit consisting of a dual equalizer amplifier with alc, and it is suitable for stereo radio cassette-tape players. features dual equalizer amplifier with a built-in alc circuit recording amp available because of high gain characteristics (variable monitor possible) good channel separation (sep = 50db typ) quick stabilization after power on capable of direct meter driving and alc transistor good alc response balance between channels wide operating supply voltage range: vcc = 4v ? 13v ordering information device package operating temperature S1A2224A01-d0b0 14 ? dip ? 300 ? 20 c ? +70 c 14 ? dip ? 300
S1A2224A01 dual eq amp with alc 2 block diagram absolute maximum ratings (ta =25 c) characteristic symbol value unit supply voltage v cc 14 v power dissipation p d 600 mw operating temperature t opr 20 ? +70 c storage temperature t stg 40 ? +125 c alc tr maximum current ? 3.5 ma 1 2 gnd output1 comp1 nf1 3 5 6 input1 alc alc 7 14 13 11 v cc output2 comp2 nf2 12 10 9 input2 alc decouple 8 + - + - out2 out1 input alc2 4 alc1
dual eq amp with alc S1A2224A01 3 electrical characteristics (ta = 25 c, vcc = 5v, r l = 10k ? , f = 1khz: play, r l = 680 ? : recording) characteristic symbol test conditions min. typ. max. unit quiescent circuit current i ccq v i = 0 ? 4.5 10 ma open loop voltage gain g vo ?? 85 ? db closed loop voltage gain g vc1 play ? 40 ? db g vc2 record ? 58 ? db output voltage v o thd =1%, play 0.9 1.2 ? v total harmonic distortion thd v o = 0.5v, play ? 0.1 1.0 % input resistance r i ? 21 30 ? k ? equivalent input noise voltage v ni bw ( ? 3db) = 20hz ? 20khz ? 1.0 2.0 v cross talk ct r g = 2.2k ? 40 50 ? db alc range v alc v i = ? 60dbm, record 35 45 ? db alc balance cb alc v i = ? 20dbm, record ? 02.0db alc distortion thd alc v i = ? 20dbm, record ? 0.5 2.0 %
S1A2224A01 dual eq amp with alc 4
dual eq amp with alc S1A2224A01 5
S1A2224A01 dual eq amp with alc 6 test circuit 0.033 f 4.7k ? 4.7 f out1 22 f in1 S1A2224A01 1 2 3 4 7 12 11 10 9 8 5 6 14 13 56 ? 680 ? 4.7 f 2.2k ? 4.7 f 300k ? r p pr 680 ? 10k ? p r 4.7 f 680 ? p r in60 in60 in60 in60 in2 4.7 f 2.2k ? 220 f 51k ? 51k ? 0.033 f 4.7k ? r p 220 f vcc pr 680 ? 10k ? out2 56 ? 22 f 10 f
dual eq amp with alc S1A2224A01 7 application information closed loop voltage gain sw on: play sw off: record 4 2 + + 10 c 3 r l 0.033 c 2 r 2 4.7k 51k z r 1 c1 r f 56 22 a. playback amplifier gv = 20 log (db) at f =1 khz, g v = 42 db (typ) z = r 1 //(r 2 + ) b. recording amplifier gv =20 log (db) at f =1 khz, g v = 58 db (typ) z r f 1 2 f ? c 2 r1 r f
S1A2224A01 dual eq amp with alc 8 alc circuit the alc circuit consists of tr 1 , tr 2 and some external components. the output level of the amplifier is recti-fied by external circuits. since this dc level is applied to the alc input terminal (pin 7), the impedance between the col- lector and emitter of tr1 can change its value. therefore, the pre-amplifier input level can be controlled. + + + 5 7 6 2 input + c 1 input r 4 d 1 r l c 4 r 2 c 2 d 3 d 2 r 3 r 1 tr 2 tr 1
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