Overview
The LA74303FN is a SPEAKER AMP and MIC AMP built-in audio interface for DSC.

Functions
• Three-wire type SERIAL communication, MIC AMP
• MIC power supply incorporated (with buit-in pull-up resistor), ALC AMP
• PB input method: Compatible with analog or digital (ΔΣ) signal input
• 3rd order LPF(compatible with REC/PB changeover, fc=4kHz or 11kHz selectable)
• SPEAKER AMP (compatible with BEEP input MIX)
• Electronic VOLUME (compatible with SERIAL communication control)
• LINE output (with SERIAL MUTE), compatible with STANDBY control