■ Overview

The AN6215S is an AGC IC for telephone speech network, and it incorporates an microphone input detection circuit and a receiver gain control circuit. It is especially best suited for cordless telephone thanks to a good speech tone quality obtained by reducing howling and echo sound.

■ Features

• Operation with wide power supply voltage range from 2.1 V to 6.0 V

• Enlargement of dynamic range by incorporating a variable VREF circuit that varies according to the supply voltage

• Possible to adjust the received voice attenuation amount with an external resistor

• Possible to adjust the AGC operating point with an external resistor

• Possible to design with fewer external components