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pb/rec eq st pre amp ka22292/q introduction the ka22292 is a monolithic integrated circuit consisting of a playback and record processing stereo amplifier, which is suitable for an audio system. features ? 2ch double input playback amplifier ? 2ch recording amplifier ? bulit-in recording equalizer ? tape selector ? alc circuit ? mute circuit ? operating voltage (v cc = 6 v ~ 12 v) ordering information device package operating temperature pitch ka22292 48-qfp-1010d -20 c ~ +70 c 0.8mm KA22292Q 48-qfp-1010e -20 c ~ +70 c 0.75mm 48-qfp-1010d/1010e block diagram figure 1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 eq & rec amp - + 1.1v i eq control alc detector alc driver control logic eq & rec amp + - + - cro2 300k 6k 10k cro2 300k line out rec nf line in alc nf1 rec r/r v/2 pr alc r/r mute in vcc head sw mixer out filcap p b o u t 2 c r o u t p b o u t n f p l a y b i n a i n a g n d 1 a i n b i n n f p l a y p b o u t c r o u t line out rec nf line in alc nf2 dub sw iref cro2a sw cro2b sw r/p sw a/b sw fil cap pb out2 r e c i n l o w c a p g l g m r e c o u t a g n d 2 f e c o u t f / q f q g p l o w c a p r e c i n voltage regulator
ka22292/q pb/rec eq st pre amp pin description table 1. pin description pin no symbol i/o description 1 line out(r) output cca (alc output) pin 2 nf rec input record amp feedback pin 3 line in(r) input line input pin 4 alc nf1 input alc amp feedback pin 5 rec r/r ? record ripple reject pin 6 vcc/2 r/r ? voltage reference ripple filter 7 alc r/r ? alc time constant 8 mute in input mute signal ( high active (input)) 9 v cc v cc v cc 10 head sw output head switching dc output pin 11 mixer out output playback mixer out 12 filcap(r) ? hi-speed filter capacitor 13 pb out-2(r) output playback output (for copy) 14 crout(r) output playback cro2 feedback output 15 pb out-1(r) output playback tape out 16 nf play input playback feedback input pin 17 a-in(r) input playback a-deck input pin 18 b-in(r) input playback b-deck input pin 19 agnd 1 gnd play gnd 20 a-in(l) input playback a-deck input pin 21 b-in(l) input playback b-deck input pin 22 nf play(l) input playback feedback input pin 23 pb out-1 (l) output playback tape out 24 crout-2 (l) output playback cro2 feedback output 25 pb out-2 (l) output playback output (for copy) 26 filc ap (l) ? hi-speed filter capacitor 27 a.b-sw input a-deck (high active) switch 28 r/p-sw input record (high active) switch 29 cro2b-sw input cro2-b-deck (high active) switch
pb/rec eq st pre amp ka22292/q 30 cro2b-sw input cro2-a-deck (high active) switch 31 iref ? eq-bpf-iref adjust 32 dub-sw input normal (low ) hi-speed (open) 33 alc in(l) input alc amp feedback pin 34 line in(l) input line input pin 35 nf rec input record amp feedback pin 36 lin out(l) output cca out 37 rec in(l) input record input pin 38 lowcap(l) ? rec equalizer low point capacitor 39 gp ? rec equalizer gain control pin 40 fq ? rec equalizer q point control pin 41 f/q ? rec equalizer q & bw control pin 42 rec out(l) output record output pin 43 agnd2 ? rec gnd 44 rec out(r) output record output pin 45 gm ? rec equalizer mid-gain control pin 46 gl ? rec equalizer low-gain control pin 47 lowcap(r) ? rec equalizer low point capacitor 48 rec in(r) input record input pin table 1. pin description (continued) pin no symbol i/o description
ka22292/q pb/rec eq st pre amp absolute maximum rating (ta = 25 c) electrical characteristics (v cc = 9 v, f = 1 khz, unless otherwise specified) characteristic symbol value unit supply voltage v ccq 12 v power dissipation p d 500 mw operating temperature t opr -20 ~ +70 c storage temperature t stg -50 ~ +125 c characteristic symbol test conditions min typ max unit quiescent circuit curent i cc rec mode, vi = 0 25 30 40 ma p l a y b a c k closed loop voltage gain g vc ? 37 40 43 db maximum output voltage v oi thd = 1% 0.71 vrms 0.7 1 ? vrms total harmonic distortion thd1 vo = 0 dbm ? 0.1 0.5 % cross talk ct1 v sg = -40 dbm 40 55 ? db muting attenuation att mute1 v sg = -40 dbm 55 70 ? db a l c alc voltage v ocalcy v sg = -20 db 28 35 45 mvrms alc distortion thd alc v sg = -20 db ? 0.3 1 % alc range v alc thd = 1 % point up 25 32 ? db r e c o r d eq low frequency gain e gh f= 50 hz/ - 40 db 29 33 37 db eq mid frequency gain e gm f = 500 hz/ - 40 db 21 25 29 db eq peak frequency gain e qp f = variable/ - 40 db 35 41 46 db maximum, output voltage v o2 thd = 1 % 1 2 ? vrms record switch voltage ? rec mode 2.4 3.5 ? v total harmonic distortion thd 2 v o = 0 dbm ? 0.5 1 % cross talk ct 2 v sg = -40 dbm 40 50 ? db muting attenuation att mute2 v sg = -40 db 55 70 ? db
pb/rec eq st pre amp ka22292/q test circuit figure 2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 eq & rec amp - + 1.1v i eq control alc detector alc driver control logic eq & rec amp voltage regulator + - + - cro2 300k 6k 10k cro2 300k + + - + + + + vcc dvm + 10k 10k 10k 6k n n + + - + + + + - + + - + + + + + - + - + + - ta1 10/16 1k 10/16 10/16 2k vsg9 10/16 10/16 10/16 22/16 2meg sw7 mute =high active 5v vcc current meter ta11 10/16 0.01v 10/16 ta13 10k 10k 10k 10/16 10/16 + ta15 10k 100 + 10/16 100 2k vsg1 10/16 10/16 2k + - vsg2 10/16 2k vsg3 2k vsg4 10/16 100 10/16 100 10/16 ta23 10k 1/16 10k 10k 10k ta25 10/16 0.01uf sw1 5v a=short b=open sw2 5v rec=short pb=open sw3 sw4 b-deck cro2=short a-deck cro2=short 20k/svr tot adjust sw6 normal speed-open hi-speed=short vsgs 2k 10/16 + + 10/16 10/16 + 10/16 1k ta36 vsg6 2k 10/16 cl 0.01 m rgf 11k rfq 33k rf/q 127k ta42 10/16 + 2k ta43 10/16 + 2k rgm 20.6k rgl 1.3k cl 0.01 m 10/16 vsg7 2k
ka22292/q pb/rec eq st pre amp application information 1. function switch ? a/b switch : a-deck mode = high (5 v) b-deck mode = open (high impedance) *** on record mode, a-deck is work only note : the voltage of pin 27 is forced by a switch controller. if the voltage varies very fast from low to high, or high to low, then tape output makes a large pop noise. to avoid this, we recommend slow switching. ? r/p switch : rec mode = high (5 v) play mode = open (high inpedance) or gnd ? cro2b switch : (b-deck only) cro2b play = gnd (0 v) cro2b off = open (high inpedance ) or v cc ? cro2b switch : (a-deck only) cro2a play = gnd (0 v) cro2a off = open (high inpedance ) or v cc ? dubbing switch : normal speed tape equalizing = open (high impedance) or v cc high speed tape equalizing = gnd (0 v) ? mute switch : mute on = high (5 v) mute off = open (high impedance) or gnd a-on b-on a/b function b-off a-off 2.5v 1.5v voltage of pin 27
pb/rec eq st pre amp ka22292/q 2. record equalizer setting this device has a frequency compensator, record equalizer circuit for boost, cut and a peak frequency that is used for tape recording. low and mid (about 30-3 khz) frequency is fixed by the external capacitor cl, and the gain is adjusted by two resistors that connect the rgm and rgl pins to the ground. internal part r m3 and external c l are fixed and r gm is adjustable by means of the external. hence, gain of mid and low frequency are controlled. high frequency peaking function consisting of a 2nd order band pass filter, can adjust the band width, gain and peak frequency using the external resistor r gp , r fq and r f/q. we have shown that r iref is a semi-fixed resistor, which compensates internal capacitors for variations of the fab- ric process. 22000 s r gm a hpf = s + r m3 * c l 1 a lpf = s + r m3 * c l 1 1 r m3 * c l r gl 8800 rm3 = 10 k, fp = 2* p rm3 * c l 1 , cl = external constant gain f a bpf = k 1 g 1 g f/q s c f/q s 2 + c f/q c f/q s + k 2 g f/q g fq c f/q c fq w o = c f/q c fq c f/q c fq q = c f/g c f/q c fq c f/q g pf = k 1 g 1 g1 = 4.4 r gp , g f/q = 1 15k * 2r iref r f/q , g fq = 1 15k * r iref r f/q , k 1 = 40 e 4 k 2 = 1 g f/q = 160 p f , , , , , , , c f/q = 70 p f
ka22292/q pb/rec eq st pre amp constant k is a gain to be fixed but k 5 is variable. only k 5 can be used to adjust the final record gain. geq = k 5 (k 3 g bpf + a hpf ) k 3 = 0.5, k 4 = 0.5 if k 5 is 10, the record maximum output level is 1 vrms and the output noise is 0.8 mvrms. we recommend that you keep it between 10 and 20 if possible. point a is pin 2 and pin 35, b is pin 44 and pin 42. k 5 , close loop gain, is r/rrr. we must connect r gp , r f/q , r gl and rgm to the ground. r gp = pin39 fq = pin40 r f/q = pin41 r gm = pin45 r gl = pin46 r iref = pin31 c l = pin38, pin47 3. connection for parameters for varying the record frequency responce, we must connect the external resistor. in the following figure, current flows from transistor through resistor. as we know, the current is defined as (1.2 v-1 vbe)/r, amount of this current influence for gm (transconductance amplifier trensfer ratio). ahpf + alpf k1 bpf k4 k3 + k5 input output (record equalizer block) + - b r = 20k rrr a
pb/rec eq st pre amp ka22292/q method of connection: connect the control pins to ground. 4. alc level adjustment this device is built so that the automatic level control circuit has a fixed level, but the user can adjust it to be larger than the fixed level. the design is fixed to 35 mvrms, but adding an external part will change that to a higher level of 1 vrms, level and range is shown in the following figure. the user may align it to his/her own needs. voltage reference 1.2 v generator pin 45, pin 44 .... pin 31, etc. r gm .... etc.... + - nn nc nm hn hm 45 44 41 40 39 31 decoder (open drain or open collector) an enabled resistor must be ground connected but others maintain high impedance state.
ka22292/q pb/rec eq st pre amp the alc out level, line out level is defined as to change gv, add a resistor that means at pin 4 or pin 33 as shown. 5. peripheral of playback amp 1) nab elements cca amp level detector line in + - line out 1v peak detect r1=20k r2=1k gv=r1/r2 pin4 or pin33 r2 r1 alc out = gv 1 2 2 2 1 = 35 mv rms a =90db + - n.f r 4 47uf x1 10k r6 6k filcap c 2 cr out pb out -1 r 2 r 2 pb out-2 rec dubing ss 300k r1 c1 a or b in h nab (s) = s + r z c 1 1 s + (r 1 +r z )c 1 1 rz = r2/r3: cro mode rz : normal mode gpb(s) = hnab(s) * (r 1 +r z )r 4 r 1 r z r 4 1 @ hnb(s) * r4 rz
pb/rec eq st pre amp ka22292/q 2) high speed dubbings cutting function is defined r5, r6, c2 fp = 2* p *(r 1 + r z )*c 1 1 fz = 2* p *r z c 1 1 g freq. fz fp hi(s) = r 6 r 5 + r 6 x s + 1 c 2 r 6 s + 1 c 2 (r 6 + r 6 ) t2 frequency t1 gain
ka22292/q pb/rec eq st pre amp application circuit figure 3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 eq & rec amp - + 1.1v i eq control alc detector alc driver control logic eq & rec amp voltage regulator + - + - cro2 300k 6k 10k cro2 300k vcc 10k 10k 10k 6k n n + mpx + + + + + + + + + + + + + + + + + + + + + + rec out rec in 4.7k 10/16 line out 3.3k 3.3k 10/16 brr 47/16 line in 10/16 0.35mvrms 1k-70mvrms 10/16 10/16 gnd 4.7/16 mute in f rom u -com vcc 3v (5 ma ) head sm mixer out 10/16 10/16 tape out for recording tape out for play out a-in-1 b-in-1 a-in-2 b-in-2 3.3k 12k 10k 10/16 0.012 47/16 82 10/16 10/16 10/16 10/16 0.012 47/16 82 10k 12k 10/16 for play out tape out + 10/16 3.3k 60k 47/16 :high>3v :low<1v high=a/open or gnd-b :high>3v, :low<1v high=rec/open or from u-com a/b sh from u-com r/p sw gnd-pb low cro2 a/open or high off from u-com cro2 b sw low= cro2 a/open or high off from u-com cro2 a sw 20k/svr to adjust open or high-normal speed/short- high speed rec mode only 10/16 0.35mvrms 1k-70mvrms 10/16 10/16 + 3.3k 3.3k max line out 10/16 4.7k cl 10/16 10/16 10/16 rec in high-metal rec out high- cro2 high-normal normal-metal normal- cro2 normal-normal high impedence-inactive low (gnd)-active from u-com

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