BA7797F

Video ICs VCR standard audio signal processor BA7797F The BA7797F is standard audio signal processor designed for use in VCRs and tape decks. The circuit is comprised of a playback preamplifier, a line amplifier, a recording amplifier, an ALC circuit and high-voltage head switch. The IC has a built-in coil equivalent circuit for recording equalization, which eliminates the need for an external component. Applications Video cassette recorders and tape decks Features 1) Two input switching systems built-in (LINE and TUNER). 2) Built-in coil equivalent circuit for recording equalization. 3) High-performance low-noise playback amplifier. 4) ALC level can be adjusted by connection of an external resistor. 5) Compatible with single-mode EQ making it ideally suited to widely-used decks. Block diagram PB IN 1 REC 18 GND REC REC HEAD SW 2 17 PB PB NFB REC OUT 3 REC AMP EQ + 28dB LINE 16 PB OUT REC L 4 0dB 15 PB LINE IN VCC 5 ALC 14 ALC FILTER RIPPLE FILTER 6 ATT – 8dB 13 TUNER IN REC / EE CTRL 7 MUTE 12 PB / TU / LINE CTRL BUFF LINE OUT 8 ATT – 8dB 11 LINE IN ALC LEVEL ADJ 9 10 MUTE CTRL 1 Video ICs BA7797F Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature each increase in Ta of 1°C over 25°C. Symbol VCC Pd Topr Tstg Limits 13 550∗ – 10 ~ + 65 – 55 ~ + 125 Unit V mW °C °C ∗ When mounted on a 50mm × 50mm × 1.6mm glass epoxy board. Reduced by 5.5mW for Re...