BH7634AS

Multimedia ICs Audio / video switch for CANAL - Plus decoder BH7634AS The BH7634AS is one-chip IC that contains audio and video switches that support 21-pin SECAM and PAL connectors. The I2C BUS for switch control simplifies applications, while the two expansion ports allow up to two external inputs. Applications VCRs Features 1) I C BUS control. 2 2) Video input is sync tip clamped, and includes a small-capacity (0.022µF) input capacitor. 3) Three FSCOUT values. 4) Two expansion ports. 5) Audio mute function. 6) 75 Ω driver output (pins 20 and 23) requires no attached capacitor. Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 13.5 1200 – 25 ~ + 60 – 55 ~ + 125 Unit V mW °C °C ∗ Reduce by 12mW for each increase in Ta of 1°C over 25°C. Recommended operating conditions (Ta = 25°C) Parameter Operating power supply voltage Symbol VCC Min. 8.5 Typ. 12 Max. 13 Unit V 1 Multimedia ICs BH7634AS Block diagram VEDC IN 1 CLAMP CLAMP 24 VVTRIN A DRVGND 2 B VSW1 6dB 23 VEXTOUT DRIVER VTUNIN 3 CLAMP A B C VSW2 BUFFER 22 VVTROUT DRVVCC 4 BUFFER 21 VVPSOUT A VEXTIN 5 CLAMP B C VSW3 6dB 20 VDECOUT DRIVER GND 6 19 VCC ADECIN 7 VCC 6.0V REG A ASW1 VCC B A BUFFER 18 AVTRIN FSCOUT 8 17 AEXTOUT AEXTIN B 9 C A ASW2 BUFFER 16 AVTROUT AUXCTL1 10 CURRENT LIMITER B C ASW3 BUFFER 15 ADECOUT AUXCTL1 ATUNIN 11 AUXCTL1 14 2 SCL FOR SW...