ZCC34018替代MC34018

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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