LINEAR INTEGRATED CIRCUIT VOICE SWITCHED SPEAKER PHONE CIRCUIT

DESCRIPTION

The HT34018 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.
• Backgroundnoiselevelmonitoringwithlongtimeconstant.
• Background sound level compensation for transmit and

receive levels as well as the background level.
• Wideoperatingdynamicrangethroughsignalcompression. • On-chipvoltageregulatorsilluminateexternalregulatorsfor lining operation.
• Power audio amplifier for typical 100mW output (into 25 ohms)with peak limiting for speaker to minimize distortion.

• ChipSelectpinforactive/standbyoperation.

• Volume control function for external volume control.

• Standard28-pinplasticDIPandSOPpackage.