ZCC34018 声控扬声通话电路  替代MC34018

概述：

The ZCC34018 Speakerphone integrated circuit incorporates the necessary amplifiers,attenuators,and control functions to produce a high quality hands-free speakerphone system.Included ar a microphoneamplifier,a power audio amplifier for the spesker,transmit and receive attenuations, a monitoring system which respongs to the relative,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 allows the chip to be powered dow when not in use. A volume control function may be implemented with anexternal potentionmeter.ZCC34018 qpplications include speakerphones  or household and business use,intercom systems,sutomotive telephones,and others.

特点：

·All necessary level detection and attenuation controls for  a hands-free telephone in a single intergrated circuit 

·Background noise level monitoring with long time  constant 

·Wide operting dynamic rangge through signal compression 

·On-chio supply and reference voltage regulation    

·Typical 100mW output power (into 25 Ohms)with peak limiting to minmize distortion   

·Chip Select pin for active/standby operation 

·Linear Volume Control Function  

·Standard 28 -pin plastic DIP package(0.600 inch wide) and SOIC package

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