KA22241B dual eq amp with alc introduction 9-sip the KA22241B is a monolithic integrated clrcuit consisting of dual equalizer amplifier with alc, and it is suitable for stereo radio cassette tape recorder. features dual equalizer amplifier with built-in alc circuit low noise; v ni =1.0 m (typ) high open loop voltage gain; 80 db (typ) wide operating supply voltage range; v cc = 4.5v ~ 14v good alc response balance between channels not necessary the input coupling capacitor not necessary diode or transistor for alc built in power supply muting circuit minimum number of external parts required ordering information block diagram fig. 1
KA22241B dual eq amp with alc absolute maximum ratings ? derated avobe ta = 2 c in the propotion of 5.5mw/ c electrical characteristics (ta = 25 c, v cc = 7v, f = 1khz, unless otherwise specified) characteristic symbol value unit supply voltage power dissipation operating temperature storage temperature v cc p d t opr t stg 16 ? 550 -20 ~ +75 -20 ~ +125 v mw c c characteristic symbol test conditions min typ max unit quiescent circuit current i ccq v i = 0 1.5 3.5 4.5 ma open loop voltage gain g vo v o = 0.3v 70 80 db closed loop voltage gain g vc v o = 0.3v 45 48 50 db output voltage v o thd = 1% 0.6 1.2 v total harmonic distortion thd v o = 0.3v 0.1 0.3 % equivalent input noise voltage v ni r g = 2.2k w , bw (-3db) = 20hz ~ 20khz 1.0 2.0 m v input resistance r i 15 25 45 k w alc range d v alc r g = 3.9k, thd = 10% 40 45 db alc balance cb alc v i = 1mv 0 2.5 db
KA22241B dual eq amp with alc test circuit fig. 2 test method symbol s1 s2 s3 s4 s5 s6 s7 s8 s9 s10 s11 i ccq on off 1 on 3 on on 3 1 off on g vo on off 1 on 1 on on 3 1 off on g vc ch -1 off on 1 on 1 on on 3 1 off on thd ch -1 off on 1 on 1 on on 3 1 off on v o ch -1 off on 1 on 1 on on 3 1 off on ch -1 off on 1 on 2 on on 3 1 off on ch -2 on off 1 on 3 on on 2 1 on off d v alc ch -1 off off 2 off 1 off on 3 1 off on cb alc off off 2 off 1 off off 1 2 off off v ni
KA22241B dual eq amp with alc application circuit fig. 3 note on playback, connect the time constant circuit as follows below, instead of r1, r2 of pins 1-3, 7-9, which are used in the nab.
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