MC34018

DESCRIPTION 

 The UTC MC34018 speaker-phone integrated circuit includes

all the active circuitry and control functions to implement a high 

quality hands-free telephone system. The circuit includes a 

microphone amplifier, a speaker amplifier, level detectors, a 

background sound level monitoring system in both the transmit and 

receive channels and an attenuation system which can control the 

transmit and receive levels as well as the background level. 

The applications include household and office 

speaker-phones, intercom systems, hand free kit for mobile 

phones, and others. 

FEATURES 

* Chip Select pin for Power conservation (active/standby mode). 

* Integrated all necessary active circuitry for a hand-free telephone

into one single chip. 

* Operating under wide dynamic range through signal compression

technology. 

* Build-In voltage regulators illuminate external regulators for lining 

operation. 

* Monitoring system for background noise level. 

* Background sound level compensation for transmit and 

 receive levels as well as the background level. 

* Power audio amplifier for typical 100mW output (into 25Ω) with 

peak limiting for speaker to minimize distortion. 

* Volume control function for external volume control circuit. 

规格书MC34018