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PBL38814 - Voice - switched 2-channel Circuit with loudspeaker amplifier

Description

The PBL 388 14 contains all the necessary circuitry, amplifiers, detectors, comparator and control functions to implement a high performance voice switched handsfree two- way communication system.

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

Features

  • the power amplifiers volume control can be implemented either as an ac. potentiometer control or as a digital control by a µprocessor (dc. control) and that the feedback loop of the power amplifier is accessible thus making it possible to add a simple external power stage driving low impedance loudspeakers up to several watts. Filtering is possible of both, the audio and the speech switching control signals, in both transmitter and receiver channels.
  • Key Features Minimum of external.

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Datasheet Details

Part number PBL38814
Manufacturer Ericsson
File Size 239.32 KB
Description Voice - switched 2-channel Circuit with loudspeaker amplifier
Datasheet download datasheet PBL38814 Datasheet

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Full PDF Text Transcription

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PRELIMINARY May 1998 PBL 388 14 Voice - switched 2-channel Circuit with loudspeaker amplifier Description. The PBL 388 14 contains all the necessary circuitry, amplifiers, detectors, comparator and control functions to implement a high performance voice switched handsfree two- way communication system. 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 14 is designed for mains powered handsfree telephones, vehicular mobile telephone handsfree systems and handsfree intercom systems. Automatic volume attenuation in the power amplifier extends the operating range at low supply currents.
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