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PBL38813 - Voice-switched Speakerphone Circuit with built in loudspeaker amplifier

Description

The PBL 388 13 contains all the necessary circuitry, amplifiers, detectors, comparator and control functions to implement a high performance, voice-switched, loudspeaking, ”hands-free ” telephone.

The gain dynamics (attenuation between channels) is selectable (25dB or 50dB) via a separate pin.

Features

  • Minimum of external components needed for function. Selectable gain dynamics. (25 or 50 dB) Direct telephone line powered solution (patented). Low power consumption: ≈1mA at 3.3V (typical) for speech switching, audio power amplifier quiscent current ≈1mA. Drives an 25 - 50 ohm loudspeaker without a transformer. Background noise compensation in the transmitting channel with hold function at receive. Input amplifiers of both channels have balanced inputs. Exellent noise performance. Encapsulated i.

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Datasheet Details

Part number PBL38813
Manufacturer Ericsson
File Size 299.69 KB
Description Voice-switched Speakerphone Circuit with built in loudspeaker amplifier
Datasheet download datasheet PBL38813 Datasheet

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Full PDF Text Transcription

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January 1998 PBL 388 13 Voice-switched Speakerphone Circuit with built in loudspeaker amplifier Description. The PBL 388 13 contains all the necessary circuitry, amplifiers, detectors, comparator and control functions to implement a high performance, voice-switched, loudspeaking, ”hands-free ” telephone. The gain dynamics (attenuation between channels) is selectable (25dB or 50dB) via a separate pin. A background noise detector in the transmitting channel reduces the influence of continuous external noise signals to the switching . The PBL 388 13 is designed for telephone systems that are either powered from the telephone line or from a mains powered constant voltage dc. supply.
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