DESCRIPTION
The UTC MC34018 speaker-phone integrated circuit incorporates the necessary functions to produce a high quality hands-free speaker-phone system. The applications include household and office speaker-phones, intercom systems, hand free kit for mobile phones, and others.

FEATURES
* All necessary level detection and attenuation controls for a hand-free telephone included.
* Background noise level monitoring with long time constant.
* Background sound level compensation for transmit and receive levels as well as the background level.
* Wide operating dynamic range through signal compression.
* On-chip voltage regulators illuminate external regulators for lining operation.
* Power audio amplifier for typical 100mW output (into 25 ohms)with peak limiting for speaker to minimize distortion.
* Chip Select pin for active/stand by operation.
* Volume control function for external volume control.
* Standard 28-pin plastic DIP and SOP package.