1 multimedia ics video signal switcher BA7605N the BA7605N is a switching ic developed for use in vcrs. it has two two-channel analog multiplexers with a large dynamic range, and wide operating frequency range. the switch has sync-tip clamped inputs and is ideal for switch- ing video signals. applications video cassette recorders and televisions features 1) two 2-input / 1-output switches. 2) sync-tip clamped inputs. 3) 5v power supply. 4) low power consumption (42mw typ.). 5) excellent frequency characteristics (10mhz, 0db typ.). 6) wide dynamic range (2.9v p-p typ.). 7) fast switching speed (50ns typ.). absolute maximum ratings (ta = 25?) parameter symbol limits unit v cc 9v 500 * mw topr c tstg ?55 ~ + 125 c ?40 ~ + 85 pd 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 1 in1a 2 v cc 3 in2a 4 ctla 5 outa 6 outb 7 ctlb 8 in2b 9 gnd 10 in1b l in 2 h in 1 sa, sb: clamp inputs ctl output
2 multimedia ics BA7605N equivalent circuits r3 22k r8 25k 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 r12 200 r16 200 r15 200 r2 4k r1 1k q5 q6 q7 q8 q10 q11 q12 q9 q3 q2 q1 out v cc in sa,sb ctl 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
3 multimedia ics BA7605N electrical characteristics (unless otherwise noted, ta = 25? and v cc = 5v) parameter symbol min. typ. max. unit conditions v cc 4.5 5.0 5.5 v i cc 8.4 10.0 ma v om 2.6 2.9 g v ?0.5 0 db 65 db g f ?3 0 db v th 2.0 2.5 3.0 v 10mhz / 1mhz, v in = 1v p-p f = 4.43mhz, v in = 1v p-p f = 1mhz, v in = 1v p-p f = 1khz, thd = 0.5% 0.5 1 c t v p-p operating voltage supply current maximum output level voltage gain interchannel crosstalk frequency characteristics ctl pin switch level note: refer to the measurement circuit given in fig. 1. reference data pin dc voltages (reference values) pin no. dc voltage dc voltage pin no. 1 2.05 6 0.65 2 5.00 7 4.91 3 2.05 8 2.05 4 4.91 9 0 5 0.65 10 2.05 units: vdc electrical characteristics parameter 0.49 0.65 0.80 vdc 1.7m w ?0 w min. typ. max. unit sync tip clamp level input impedance (with clamp) output impedance the input coupling capacitor values should be 0.1 m f to 1 m f.
4 multimedia ics BA7605N measurment circuit 1 2 3 4 5 6 7 8 9 10 v in1a s 1a 223 47 m osc r 123 ~ v in1b s 1b osc r 105 105 123 v in2a s 2a osc r 123 ~ ~ ~ v in2b s 2b osc r r = 75 w 105 105 105 105 105 105 23 1 v v cc v cc s 3a 123 s 3b 123 v cc a1 v fig.1
5 multimedia ics BA7605N 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 c t c t c t c t 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 note 1 ammeter note 2 note 3 note 4 note 5 parameter symbol switch settings measurement method current dissipation maximum output level voltage gain inter- channel crosstalk frequency character- istic ctl pin switching level 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 v om (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 . measurement conditions external dimensions (units: mm) 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
|
