KA22900 am/fm tuner + mpx introduction the KA22900 is a monolithic intergrated circuit which consists of a 3v one chip tuner and fm multiplex for am/fm radios and head- phone radios. functions * fm stage : rf/if/af amp, quadrature detector, mix, osc, tuning indicator. * am stage : rf/if/af amp, detector, mix, osc, agc, tuning indicator. * mpx stage : pll amp, decoder, flip flop, vco stop, phase detector, stereo indicator. features 3v one chip tuner with built - in fm multiplex no am detect coil, if coupling capacitor, fm if by-pass capacitor needed. built-in tuning indicator function. built-in am/fm selection switch. minimum number of external parts required. wide operating voltage range : v cc = 1.8v ~ 7v low distortion (fm if : 0.4%, am if : 1%, 0.2% (typ) ). block diagram
KA22900 am/fm tuner + mpx absolute maximum ratings (ta = 25 c) characteristic symbol value unit supply voltage power dissipation operating temperature storage temperature led driver voltage led driver current v cc p d t opr t stg v dr i dr 8 1200 -20 ~ +75 -55 ~ +150 10 10 v mw c c v ma elecrtrical characteristics (ta = 25 c, v cc = 3v, unless otherwise specified) fm f/e : f = 98mhz, fm = 1khz, d f = 22.5khz am : f = 1khz, 30% mod fm if : f = 10, 7mhz, fm = 1khz, d f = 22.5khz mpx : f = 1khz, l + r = 90%, p = 10%, v i = 150mv characteristics symbol test condition min typ max unit test circuit quiescent circuit current i ccq1 fm, v i =0 8.4 13.2 20.0 ma 1 i ccq2 am, v i = 0 4.4 8.4 13.4 ma 1 f/e -3db limiting sensitivity v i (lim)1 v o = -3db 10 db m 1 oscillation voltage v osc f osc = 98mhz 40 70 110 mv 2 fm -3db limiting sensitivity v i(lim)2 v o = -3db 40 46 53 db m 1 if detector output voltage v o (det)1 v i = 80db m 55 80 110 mv 1 signal to noise ratio s/n 1 v i = 80db m 60 70 db 1 total hatmonic distortion thd 1 v i = 80db m 0.4 1 db m 1 am rejection ratio amr v i = 80db m 22 32 db 1 tuning indication voltage v li i led = 1ma 45 51 56 db m 1 voltage gain g v1 v i = 26db m 40 70 110 mv 1 am detector output voltage v o(det)2 v i = 60db m 55 80 110 mv 1 if signal to noise ratio s/n 2 v i = 60db m 32 42 db 1 total harmonic distortion thd 2 v i = 60db m 1 2 % 1 tuning indication voltage vl 2 i led = 1ma 20 25 30 db m 1 maximum input voltage v i(max) stereo, thd = 3% 250 350 mv 1 mpx cs 1 stereo, f = 100hz 35 42 db 1 channel separation cs 2 stereo, f = 1khz 35 42 db 1 cs 3 stereo, f = 10khz 35 42 db 1 total harmonic distortion thd 3 mono 0.2 1 % 1 thd 4 stereo 0.2 1 % 1 voltage gain g v2 mono -5 -3 -1 db 1 channel balance cb mono -2 0 2 db 1 lamp on level vl (on) pilot only 8 16 mv 1 vl (off) pilot only 2 6 mv 1 lamp hysteresis hy 2 mv 1 capture range cr pilot only 1 3 5 % 1 signal to noise ratio s/n 3 mono 60 70 db 1
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