Datasheet Summary
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1. GENERAL DESCRIPTION
The BL34018 Speakerphone integrated circuit Incorporates the necessary amplifiers ， attenuators ， and control functions to produce a high quality hands free speakerphone system． Include are a microphone amplifier， a power audio amplifier for the speaker， transmit and receive attenuators，a monitoring system for background sound level，and an attenuation control system which responds to the relative transmit and receive levels as well as the background level．Also included are all necessary regulated voltages for both internal and external circuitry， allowing line-powered operation (no additional power supplies required)．A chip select pin...