Overview

The LA7289 includes on chip all functions required for the record and playback of VCR audio signals and achieves complete adjustment-free operation by the adoption of an automatic record bias current adjustment circuit. In addition, the inclusion of a switching circuit for switching between tuner and line input in addition to the circuits provided by earlier ICs makes the LA7289 truly optimal for audio VCR products.

Features

• Adjustment-free record bias current (automatic adjustment circuit adopted)

• Built-in record bias oscillator circuit power supply switch

• Record equalizer choke coil no longer required

• Playback amplifier input noise voltage: 1.0 µV rms

• Value of the ALC detector capacitor reduced (to 3.3 µF)

• Built-in high-voltage head switching circuit

• Supply voltage: supports both 9 and 12-V operation

• Built-in input switching circuit (for the line and tuner inputs)

Functions

• Equalizer amplifier

• Ripple filter

• Record/playback switching circuit

• Muting

• SP/LP/EP switching circuit

• Record amplifier

• ALC

• Tape head switching circuit

• Automatic record bias adjustment circuit

• Input switching circuit (line/tuner)