Video signal switcher for AV amplifiers

Transcription

1 ideo signal switcher for A amplifiers BA765 The BA765 is a video signal switch that contains two five-channel analog multiplexers and wide-band 6dB amplifiers.it designed for use in video cassette recorders. By simply adding transistor buffers to the outputs,it is possible to construct arecord / playback switch for two record / playback CRs, and three video playback machines (eg.laser disk players). Input switching and CR record switching can be done independently. The BA765 has sync-tip clamp inputs which are ideal for switching video signals. Applications A amplifiers and video selectors Features ) 5-input / -output switches. ) Sync-tip clamp inputs. ) Built-in 6dB amplifiers. 4) 5 supply voltage. Absolute maximum ratings (Ta = 5 C) Parameter Symbol Limits Unit Power supply voltage CC 9 Power dissipation Pd 500 mw Operating temperature Topr 5 ~ 70 C Storage temperature Tstg 55 ~ 5 C Reduced by 5mW for each increase in Ta of C over 5 C.

2 BA765 Block diagram 6 IN GND 6dB 5 CTL A IN5 logic 4 OUT GND 4 CC IN4 5 6dB IN CTL E 6 logic CTL B IN 7 0 OUT CTL D 8 9 CTL C C D E OUT A B E C D E OUT Truth table L L IN L L L L IN H L IN H L IN H L L H IN L H IN L H IN H H L IN4 H H L IN4 H H L IN4 H H H IN5 H H H IN5 H H H IN5 Note : indicates "don't care" (H or L).

3 BA765 Equivalent input / output circuits Input circuit Waveform IN ~ IN5 IN cc R R P-P Q.7 Q I 00µA Q DC.0 CTLA ~ CTLE IN cc cc = 5.0 R R R High level. k 58k O 58k Q Q R4 Low level. 8k cc R Q R 7k 00 Q4 P-P Q Q Q5 MONOUT DC 0.5.4mA OUT, OUT cc OUT Q I R R 5BUR 48k 00 Q O DN I 600µA Q Q4.4mA OUT P-P DC 0.5

4 BA765 Electrical characteristics (unless otherwise noted, Ta = 5 C and CC = 5) Parameter Symbol Min. Typ. Max. Unit Conditions Operating voltage CC Supply current ICC ma Maximum output level om.6.9 P-P f = khz, THD = 0.5% oltage gain G db f = MHz, IN = P-P Interchannel crosstalk CT db f = 4.4MHz, IN = P-P Mute level CTM 5 5 db f = 4.4MHz, IN = P-P Frequency characteristic Gf 0 db 0MHz / MHz, IN = P-P CTL pin switch level TH.. Not designed for radiation resistance. Measurement circuit CC CC SW SWA SW SWB 0 CC CC 4.7µ A OUT OUT SWC logic logic 6dB 6dB SWD MONITOR OUT SW5 SW4 SW CC SWE CC Fig. 4

5 BA765 Measurement conditions Parameter Current dissipation maximum output level voltage gain interchannel crosstalk frequency characteristic OUT maximum output level Symbol SW SW SW SW4 SW5 SWA SWB SWC SWD SWE ICC om MON om MON om MON om 4MON om 5MON G MON G MON G MON G 4MON G 5MON CT-MON CT-MON CT-4MON CT-5MON CT-MON CT-MON CT-4MON CT-5MON CT-MON CT-MON CT-4MON CT-5MON CT4-MON CT4-MON CT4-MON CT4-5MON CT5-MON CT5-MON CT5-MON CT5-4MON Gf MON Gf MON Gf MON Gf 4MON Gf 5MON om OUT om OUT om 4OUT om 5OUT Switch settings Measurement method Note Note Note Note 4 Note 5

6 BA765 Parameter Symbol Switch settings SW SW SW SW4 SW5 SWA SWB SWC SWD SWE Measurement method OUT voltage gain G OUT G OUT G 4OUT G 5OUT Note CT-OUT CT-OUT CT-4OUT CT-5OUT CT-OUT CT-OUT CT-4OUT CT-5OUT OUT interchannel crosstalk CT-OUT CT-OUT CT-4OUT CT-5OUT Note CT4-OUT CT4-OUT CT4-OUT CT4-5OUT CT5-OUT CT5-OUT CT5-OUT CT5-4OUT OUT frequency characteristic Gf OUT Gf OUT Gf 4OUT Gf 5OUT Note 4 OUT maximum output level om OUT om OUT om 4OUT om 5OUT Note OUT voltage gain G OUT G OUT G 4OUT G 5OUT Note 6

7 BA765 Parameter Symbol Switch settings SW SW SW SW4 SW5 SWA SWB SWC SWD SWE Measurement method CT-OUT CT-OUT CT-4OUT CT-5OUT CT-OUT CT-OUT CT-4OUT CT-5OUT OUT interchannel crosstalk CT-OUT CT-OUT CT-4OUT CT-5OUT Note CT4-OUT CT4-OUT CT4-OUT CT4-5OUT OUT frequency characteristic Mute level CTL switching level CT5-OUT CT5-OUT CT5-OUT CT5-4OUT Gf OUT Gf OUT Gf 4OUT Gf 5OUT CTM OUT CTM OUT TH A TH B TH C TH D TH E Note : Connect a distortion meter to the output, and input a f = khz sine wave. Adjust the input level until the output distortion is 0.5%. This output voltage at this time is the maximum output level om (P-P). Note : Input a P-P, MHz sine wave. The voltage gain (in db) is given by G = 0 log (OUT / IN). Note : Input a P-P, 4.4MHz sine wave. The interchannel crosstalk (in db) is given by CT = 0 log (OUT / IN) 6. Note 4: Input P-P, MHz and 0MHz sine waves. The frequency characteristic (in db) is given by Gf = 0 log (OUT (f = 0MHz) / OUT (f = MHz) ). Note 5: Input a P-P, 4.4MHz sine wave. The mute level is given by CTM = 0 log (OUT / IN) 6 (db). Note 6: Input a P-P, MHz sine wave. Reduce the CTL pin voltage from CC. The CTL pin switching level (TH) is the CTL pin voltage at which the OUT level drops below 0mP-P. Note 4 Note 5 Note 6 7

8 BA765 Application example CC 00Ω 470µ T AUX BS LD FRONT REAR.µ.µ.µ MONOUT IN GND IN5 GND IN4 CTL E IN CTL A OUT CC IN CTL B OUT Ω CC 470µ A9 0.0µ CC 00Ω 470µ.µ 47µ.µ 5.0 OUT TR IN OUT TR IN 8 CTL D CTL C 9 F / R CTL REC CTL MON CTL Fig. External dimensions (Units: mm) 9.4 ± ± ± ± Min ± ~ 5 0. ± 0. DIP6 8