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)