1 video ics video switch for canal-plus decoder BA7631 / BA7631f the BA7631 and BA7631f are audio-switching ics for decoders for scrambled pay channels used in france and other countries. the ics include a five-input multiplexer, a four-input multiplexer and a two-input multiplexer, and allow decoder audio switching to be done with a single ic. when used in combination with the ba7630s common logic control can be used for audio and video switching. applications video cassette recorders features 1) all the audio-switching functions required for secam canal -plus decoder integrated onto one chip. 2) inputs terminated with 65k w resistors. 3) built-in output buffer. 4) wide supply voltage range (4.5v to 13.0v). 5) low total harmonic distortion (0.005% typ.). 6) wide dynamic range (3.6vrms, v cc = 12v). 7) same control logic as for the ba7630s can be used. absolute maximum ratings parameter symbol limits unit v cc 13.5 v mv c c 1100 * (dip) 500 * (sop) ? 55 ~ + 125 ? 25 ~ + 70 pd topr tstg * reduced by 11mw (dip) or 5mw (sop) for each increase in ta of 1 c over 25 c. applied voltage power dissipation operating temperature storage temperature recommended operating conditions (ta = 25?) parameter symbol limits unit v cc 4.5 ~ 13.0 v power supply voltage
2 video ics BA7631 / BA7631f block diagram 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 bf bf bf 1 2 3 4 sw2 1 2 3 4 5 sw1 1 2 sw3 BA7631 out1 ctl4 in5 v cc in4 gnd2 in1 ctl1 out2 ctl5 ctl3 out3 ctl2 in3 gnd1 in2
3 video ics BA7631 / BA7631f truth table pin descriptions ctl1 ctl2 ctl5 select lllin1 l h l in2 h l l in3 h h l mute ** h in5 out1 sw1 block * don't care ctl3 ctl5 select ll hl lh hh in1 in3 in5 in3 out2 sw2 block ctl4 select l h in2 in4 out3 sw3 block 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 out2 ctl5 ctl3 out3 ctl2 in3 gnd1 in2 ctl1 in1 gnd2 in4 v cc in5 ctl4 out1 pin no. function pin name output 1 control 4 input 5 power supply input 4 gnd (gnd1 common) input 1 control 1 input 2 gnd (gnd2 common) input 3 control 2 output 3 control 3 control 5 output 2
4 video ics BA7631 / BA7631f input / output circuits n 50 1.8ma 1 v cc q 1 8 12 14 15 10k 30k 36k 14k v cc 2 1.8ma 25 13 16 v cc 6.0v 125 m a 100 30 m a v cc 3, 5, 7, 9, 11 65k
5 video ics BA7631 / BA7631f electrical characteristics (unless otherwise noted, ta = 25? and v cc = 12v) parameter symbol min. typ. max. unit v cc 4.5 12.0 13.0 v i cc 14.9 24.0 ma v om 3.1 3.6 v rms g v ? 0.5 0 0.5 db thd 0.005 0.1 % c tm 75 ? 60 db v min. 20.0 40.0 m v rms v th 1.0 2.0 3.0 v z in 48.5 65 80.5 conditions k w f = 1mhz, thd = 0.5 % f = 1khz, v in = 3.0dbm f = 1khz, v in = 3.0dbm f = 10khz, v in = 3.0dbm 30khz lpf, r g = 2.2k w s not designed for radiation resistance. recommended operating voltage circuit current maximum output level voltage gain total harmonic distortion interchannel crosstalk input conversion noise voltage ctl switch level input impedance circuit operation the BA7631 and BA7631f make it easy to construct a decoder for the scrambled pay channels. they have been designed specifically for audio signal decoding. as shown in the application examples in figs. 1 and 2, there are inputs for tv, vcr, decoder, and aux, to cover a wide range of applications. when the aux input is not used, by setting ctl5 to ?? the system construction becomes the same as that of the ba7630s, and the ba7630s switching logic can be used as is. application example 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 bf bf bf 1 2 3 4 sw2 sw1 1 2 3 4 5 1 2 sw3 22 m f 22 m f 22 m f 22 m f 22 m f 22 m f 47 m 22 m f from v cc to vtr in ctl4 for sw3 from ext out from vtr out from vtr tuner out ctl1 for sw1 to decoder in ctl5 for sw2 ctl3 for sw2 to tv in ctl2 for sw1 from tv out decoder out fig.1 + + + + + + + +
6 video ics BA7631 / BA7631f tuner in out vtr decoder in out 7 9 11 3 5 2 13 14 16 15 12 8 1 out in tv ext out 22 m f 22 m f 22 m f ctl1 ctl2 ctl3 ctl5 ctl4 sw1 bf sw2 1 2 3 4 1 2 sw3 bf bf 1 2 3 4 5 22 m f 22 m f 22 m f 22 m f 22 m f (aux) fig.2 + ++ + + + + +
7 video ics BA7631 / BA7631f electrical characteristic curves 1.0 2.0 3.0 4.0 0 0.010 0.100 0.001 total harmonic distortion ( % ) v cc = 12.0 (v) f = 1 (khz) input voltage: (vrms) fig. 3 distortion characteristics 51015 0 1.0 2.0 3.0 4.0 5.0 max. output level (vrms) v cc = 12.0 (v) f = 1 (khz) thd = 0.5 ( % ) power supply voltage: (v) fig. 4 power supply voltage vs. dynamic range characteristics external dimensions (units: mm) sop16 0.51min. 0.3 0.1 9 16 8 1 6.5 0.3 3.2 0.2 4.25 0.3 0.5 0.1 19.4 0.3 2.54 0 ~ 15 7.62 dip16 BA7631 BA7631f 0.4 0.1 1.27 0.15 0.15 0.1 0.3min. 4.4 0.2 6.2 0.3 0.11 1.5 0.1 1 16 10.0 0.2 8 9
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