1 multimedia ics video signal switcher BA7604N the BA7604N is a switching ic developed for use in vcrs. it has two-channel analog multiplexers, and features wide dynamic range, and wide operating frequency range, and is suitable for switching audio and video signals. applications vcrs and tvs features 1) two 2-input / 1-output switches. 2) 5v power supply. 3) low power consumption (42mw typ.). 4) excellent frequency characteristics (10mhz, 0db, typ.). 5) wide dynamic range (3.0v p-p typ.). 6) high input impedance (20k w typ.). 7) fast switching speed (50ns typ.). absolute maximum ratings (ta = 25?) parameter symbol limits unit 9v mw c c 500 * v cc topr pd tstg ?40 ~ + 85 ?55 ~ + 125 power supply voltage power dissipation operating temperature storage temperature * reduced by 5.0mw for each increase in ta of 1 c over 25 c. block diagram s a s b 12345678910 in1a v cc in2a ctla outa outb ctlb in2b gnd in1b l in2 h in1 ctl output s a , s b : non-clamped
2 multimedia ics BA7604N equivalent circuits r3 13.6k r4 200 r5 33k r17 12k i1 0.6ma i2 0.3ma i4 0.6ma i5 1ma r7 100 r10 100 r11 100 r13 100 r14 100 r9 200 r6 20k r12 200 r16 200 r15 200 r2 2.2k r1 1k q4 q5 q7 q8 q10 q11 q12 q9 q3 q2 q1 out v cc in sa, sb r3 400 r4 400 r5 25k r2 200 q3 q1 q5 q6 q2 q4 ctl r6 25k r1 50k v cc i2 0.6ma i1 0.25ma i3 0.06ma ctl
3 multimedia ics BA7604N electrical characteristics (unless otherwise noted, ta = 25? and v cc = 5.0v) parameter symbol typ. max. unit conditions v cc 4.5 5.0 5.5 v i cc 8.4 13.0 ma 2.7 3.0 f = 1khz, thd = 0.5% g v ?0.5 0 db c t 65 db ?3 0 db thd 0.007 % v th 2.0 2.5 3.0 v 14 20 26 k w z in g f v om f = 1mhz, v in = 1v p-p f = 4.43mhz, v in = 1v p-p f = 1mhz, v in = 1v p-p 10mhz / 1mhz, v in = 1v p-p 0.5 1 v p-p min. note: refer to the measurement circuit given in fig. 1. operating voltage supply current maximum output level voltage gain interchannel crosstalk frequency characteristic total-harmonic distortion ctl pin switch level input impedance reference data pin dc voltages (reference values) 1 2.48 90 2 5.00 10 2.48 3 2.48 4 4.91 5 1.76 6 1.76 7 4.91 8 2.48 pin no. dc voltage dc voltage pin no. units: vdc electrical characteristics parameter 20k w ?0 w min. typ. max. unit input impedance (no clamp) output impedance the input coupling capacitor values should be 0.1 m f to 1 m f.
4 multimedia ics BA7604N measurement circuit v v a1 1 234 5 67 8910 v cc 223 47 m s 1a s 2a s 3a s 3b s 2b s 1b 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 v cc v cc v in2b v in1b osc osc rr osc osc rr r = 75 w 105 105 105 105 v in2a v in1a 105 105 105 105
5 multimedia ics BA7604N s 1a s 2a s 3a s 1b s 2b s 3b i cc 222222 i n1a i n2a i n1b i n2b v om v om v om v om 3 2 2 2 2 3 2 2 2 3 2 2 2 2 3 2 2 2 2 3 2 2 2 3 i n1a i n2a i n1b i n2b g v g v g v g v 3 2 2 2 2 3 2 2 2 3 2 2 2 2 3 2 2 2 2 3 2 2 2 3 i n1a i n2a i n1b i n2b 2 3 2 2 3 2 2 2 2 3 2 2 2 2 2 3 2 2 3 2 2 2 2 3 i n1a i n2a i n1b i n2b g f g f g f g f 3 2 2 2 2 3 2 2 2 3 2 2 2 2 3 2 2 2 2 3 2 2 2 3 ctla ctlb v th v th 3 2 2 2 1 2 2 3 2 2 2 1 i n1a i n2a i n1b i n2b thd thd thd thd 3 2 2 2 2 3 2 2 2 3 2 2 2 2 3 2 2 2 2 3 2 2 2 3 i n1a i n2a i n1b i n2b z in z in z in z in 1 2 2 2 2 1 2 2 2 3 2 2 2 2 1 2 2 2 2 1 2 2 2 3 c t c t c t c t note 1 ammeter note 2 note 3 note 4 note 5 note 6 note 7 parameter symbol switch settings measurement method current dissipation maximum output level voltage gain interchannel crosstalk frequency character- istic ctl pin switching level total- harmonic distortion input impedance note 1: connect a distortion meter to the output, and input a f = 1khz sine wave. adjust the output level until the output distortion is 0.5%. this output voltage at this time is the maximum output level vom (v p-p ). note 2: input a 1v p-p , 1mhz sine wave. the voltage gain is given by g v = 20 log (v out / v in ). note 3: input a 1v p-p , 4.43mhz sine wave. the interchannel crosstalk is given by c t = 20 log (v out / v in ). note 4: input 1v p-p , 1mhz and 10mhz sine waves. the frequency characteristic is given by g f = 20 log (v out (f = 10mhz) / v out (f = 1mhz)). note 5: input a 1v p-p , 1mhz sine wave. reduce the ctl pin voltage from v cc . the ctl pin switching level (v th ) is the ctl pin voltage at which the v out level drops below 20mv p-p . note 6: input a 1v p-p , 1khz sine wave and measure the total-harmonic distortion of the output using a total-harmonic dis- tortion meter. note 7: measure the input pin voltage v in 50 when a current of dc50 m a is flowing into the input pin. measure the input pin open-circuit voltage. the input impedance is given by z = (v in 50 - v in 0 ) / 50 10 -6 [ w ]. measurement conditions
6 multimedia ics BA7604N sip10 2.8 0.2 25.2 0.2 10.5 0.5 0.6 1.3 10 2.54 3.5 0.5 1 5.8 0.2 1.2 0.3 0.1 0.8 external dimensions (units: mm)
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