HT34018
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.
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ChipSelectpinforactive/standbyoperation.
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Volume control function for external volume control.
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Standard28-pinplasticDIPandSOPpackage.