BA8400FV

Video ICs CTL recording / playback amplifier for VHS VCRs BA8400FV The BA8400FV is a CTL recording / playback amplifier developed for VHS VCRs. The playback amplifier has an AGC circuit that can handle large input signal fluctuations, and a recording / playback switching circuit is provided to allow high-speed switching. Applications VHS-format VCRs Features 1) Can be operated off low power supply voltage (2.7V to 3.5V). 2) Playback amplifier with AGC. 3) Fast switching between recording and playback. Block diagram MONI OUT HysBIAS FILTER 14 13 12 11 10 9 8 P RECPBGND 7 Ref R CTL – 6 BIAS AGC IN – AMP CTL + 5 P VCC DET REC AMP R P 1 2 SW 3 CTL OUT RECHPB RECIN GND 4 R AGC 1 Video ICs BA8400FV Pin descriptions Pin No. 1 Pin name CTL OUT (CTL pulse output) RECHPB (record / play switch) RECIN (REC CTL pulse input) GND CTL + (CTL head “+” input) CTL – (CTL head “–” input) RECPBGND BIAS (bias) IN – (playback amplifier input) Function CTL pulse output. High output level approx. VCC – 0.05V, IO = + 0.5mA Low output level approx. 0.05V, IO = – 0.5mA Switch input pin for the record / playback amplifiers. High input: REC mode Low input: PB mode Threshold voltage: approx. 1 / 2VCC CTL pulse input pin for recording. Threshold voltage: approx. 1 / 2VCC Power, REC / PB SW, CTL output buffer ground pin. When recording: CTL head positive-side recording current. When playing: input pin for the playback CTL pulse. When recording: CTL head negative-side recording cur...