DESCRIPTION
LI NEAR I NTEGRATED CI RCUI T Included 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 lining powered operation(no additional power supplies required).A chip select pin allows the chip to be powered down when not in use. A volume control function may be implemented with an external potentiometer. DIP-28 FEATURES
*All necessary level detection and attenuation controls for a hand-free telephone in a single integrated circuit *Background noise level monitoring with long time constant *Wide operating dynamic range through signal compression *On-chip supply and reference voltage regulation *Typical 100mW output power(into 25 ohms)with peak limiting to mi...
Youwang
