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U3900BM - Programmable Telephone Audio Processor

General Description

The programmable telephone audio processor U3900BM is a linear integrated circuit for use in feature phones, answering machines, fax machines and cordless phones.

It contains the speech circuit, tone-ringer interface with DC/DC converter, sidetone equivalent and ear-protection rectifiers.

Key Features

  • D D D D D D D D D D D Speech circuit with anti-clipping Tone ringer interface with DC/DC converter Speaker amplifier with anti-distortion Power-supply management, regulated, unregulated and a special supply for electret microphone Voice switch CLID + SCWID DTMF generator Switch matrix Line current information Fully programmable Watchdog Benefits D Savings of one piezoelectric transducer D Complete system integration of analog signal processing on one chip D Very few external components D High.

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U3900BM Programmable Telephone Audio Processor Description The programmable telephone audio processor U3900BM is a linear integrated circuit for use in feature phones, answering machines, fax machines and cordless phones. It contains the speech circuit, tone-ringer interface with DC/DC converter, sidetone equivalent and ear-protection rectifiers. The circuit is line-powered and contains all components necessary for signal amplification and adaptation to the line. The U3900BM can also be supplied via an external power supply. An integrated voice switch with loudspeaker amplifier enables hands-free or loudhearing operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly.