BA7654F multimedia ics 2-input, 1-output video signal switcher BA7654F the BA7654F is video signal switch consisting of two input pins (in1 and in2), one ctl pin (ctl), and one output pin (out). the inputs are sync-tip clamped (synchronous edge of the video input signals are aligned to the same voltage), and as the input impedance is extremely large, it is possible to use a small value for the clamp capacitor (the recommended capacitor is 0.01 f (fz) ceramic). ! ! ! ! applications vcrs, tvs, and other equipment using video signals ! ! ! ! features 1) small clamp capacitors can be used (ceramic, 3000pf (min.), 0.01 f (fz) (recommended)). 2) low supply voltage operation possible supply voltage range is 3.7v to 7.7v. 3) superimposition used for fast switching speed with low switching noise (70ns typ.). 4) low power consumption (when v cc =5v, 25mw typ.). 5) wide dynamic range (when v cc =5v, 3.1v p-p typ.). 6) excellent frequency characteristics (10mhz, 0db typ.). 7) low interchannel crosstalk ( ? 70db typ.). 8) voltage can be applied to the control pins even when v cc is not applied. ! ! ! ! block diagram 1 in1 gnd 8 2 ctl out 7 3 in2 v cc 6 4 gnd open. 5 logic
BA7654F multimedia ics ! ! ! ! selected output mode setting table ctl out l in1 h in2 ! ! ! ! absolute maximum ratings (ta=25 c) parameter symbol limits 9 500 ? ? 25 + 75 ? 55 + 125 unit v mw c c v cc pd topr tstg applied voltage power dissipation operating temperature storage temperature ? reduced by 50mw for each increase in ta of 1 c over 25 c. ! ! ! ! recommended operating conditions (ta=25 c) parameter symbol limits 4.0 7.0 unit v v cc operating power supply voltage not designed for radiation resistance.
BA7654F multimedia ics ! ! ! ! input / output circuits vcc in1 100 50 a pin no. pin name reference voltage (v cc = 5v) input / output impedance 1 1.65v in 1 10m ? or more 2 ? ctl ? 3 1.65v in 2 10m ? or more 4 ? gnd ? equivalent circuit vcc ctla 1.9v 50k 2.3v vcc in1 100 50 a gnd
BA7654F multimedia ics pin no. pin name reference voltage (v cc = 5v) input / output impedance 6 0.5v v cc ? 7 0.95v out 26 ? 80v gnd ? equivalent circuit vcc out ima vcc vcc gnd
BA7654F multimedia ics ! ! ! ! electrical characteristics (unless otherwise noted, ta=25 c, v cc =5.0v) parameter symbol min. 3.7 2.7 2.6 ? 0.5 typ. ? 5.0 3.1 0 max. 7.7 8.2 ? + 0.5 v cc i cc vom g v power supply voltage circuit current maximum output level voltage gain interchannel crosstalk frequency characteristics ctl switching voltage unit v ma v p-p db conditions f=1khz, thd=1.0% f=1mhz, v in =1.0v p-p ? 3.0 0 + 1.0 gf db v ? f=10mhz/1mhz, v in =1.0v p-p ?? 1.0 vthl 2.5 ?? vthh ?? 70 ? cta db f=4.43mhz, v in =1.0v p-p ? vcc-ctl threshold level vth = 20 (v) vcc-v f 45 ? ? ! ! ! ! guaranteed design parameters (unless otherwise noted, ta=25 c, v cc =5v) parameter symbol min. ? typ. 0 max. 0.5 dg differential gain differential phase unit % ? 0.5 1.0 dp deg conditions v in =1.0v p-p standard staircase signal v in =1.0v p-p standard staircase signal ! ! ! ! measurement circuit 1 8 2 7 3 6 4 5 logic clump clump sw7 12 vector scorp vcc sw2 12 47 0.1 c11 c10 open 2.5v 1.0v sw1 12 osc c1 c2 3 c3 3300p 3300p 3300p 1.0v v a sg sw3 12 osc c4 c5 3 c6 3300p 3300p 3300p sg fig. 1
BA7654F multimedia ics ! ! ! ! measurement conditions parameter circuit current voltage gain frequency characteristics interchannel crosstalk differential gain differential phase maximum output level in1 in2 in1 in2 in1 in2 in1 in2 in2 in1 in1 in2 in1 in2 symbol sw1 sw3 sw2 sw7 conditions icc 3 3 2 ?? f=1khz thd=1.0% ? 1 v in =1.0v p-p f=1mhz ? 2 v in =1.0v p-p f=1mhz and 10mhz ? 3 v in =1.0v p-p f=4.43mhz ? 4 v in =1.0v p-p standard staircase signal v in =1.0v p-p standard staircase signal vom1 vom2 gv1 gv2 gf1 gf2 cta1 ? 2 cta2 ? 1 d g 1 d g 2 d p 1 d p 2 1 3 1 3 1 3 1 3 2 3 2 3 3 1 3 1 3 1 3 1 3 2 3 2 1 2 1 2 1 2 2 1 1 2 1 2 1 1 1 1 1 1 1 1 2 2 2 2 ? ctl switching level is substituted by performing the above measurements. ? 1 connect a distortion meter to the output. after adding a f=1khz sine wave input from the osc, adjust the input level so that the output distortion is 1.0%. the output voltage at that time is the maximum output level vom [v p-p]. ? 2 apply to the input pin a v in =1.0v p-p , f=1mhz sine wave input. voltage gain g v =20-log (v out / v in ) ? 3 apply to the input pin v in =1.0v p-p , f=1mhz and 10mhz sine wave inputs. frequency characteristics gf=g v (f=1mhz) ? g v (f=10mhz) ? 4 apply to the input pin a v in =1.0v p-p , f=4.43mhz sine wave input. interchannel crosstalk cta=20log (v out / v in )
BA7654F multimedia ics ! ! ! ! application examples 1 c.video in 6 3 5 7 2 4 in 1 BA7654F c.video out in 2 open ctl gnd vcc out gnd 8 0.01 c.video in 0.01 logic 0.1 47 vcc fig. 2 1 6 3 5 7 2 4 in 1 BA7654F c.video out / dc out in 2 open ctl gnd vcc out gnd fig. 3 8 dc 1.7v (min) logic c.video in 0.01 0.1 47 vcc
BA7654F multimedia ics ! ! ! ! operation notes (1) to ensure stable clamp operation, the output impedance of the previous stage connected to the inputs should be 1k ? or lower. (2) if large input clamp capacitors are used, the time constant of the circuit will mean that some time will be required until stable operation after power is applied. the value for the input clamp capacitors is 0.1 f max. (0.01 f (fz) ceramic capacitor recommended). (3) if ctl pins are unstable when open. set them to either h or l. (4) when using superimposition, the dc voltage directly applied to the inputs should be at least 1.7v. ! ! ! ! external dimensions (units : mm) sop8 0.3min. 0.15 0.1 0.4 0.1 0.11 6.2 0.3 4.4 0.2 5.0 0.2 85 4 1 1.27 1.5 0.1 0.15
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