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PBL38570 - Universal Speech Circuit

General Description

PBL 38570 is a monolithic integrated speech transmission circuit for use in electronic telephones.

It is designed to accomodate either a low impedance dynamic or an electret microphone.

Key Features

  • Minimum number of external components, 7 capacitors and 11 resistors. Easy adaption to various market needs. Mute control input for operation with DTMF - generator. A separate input for DTMF tones controlled by mute. Transmitter and receiver gain regulation for automatic loop loss compensation. Extended current and voltage range 5 - 130 mA, down to 2 V. Differential microphone input for good balance to ground. Balanced receiver output stage. Stabilized DC - supplies for low current CM.

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Datasheet Details

Part number PBL38570
Manufacturer Ericsson
File Size 238.00 KB
Description Universal Speech Circuit
Datasheet download datasheet PBL38570 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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September 1997 PBL 385 70 Universal Speech Circuit Description. PBL 38570 is a monolithic integrated speech transmission circuit for use in electronic telephones. It is designed to accomodate either a low impedance dynamic or an electret microphone. A separate input for DTMF dialling tones that is controlled by a mute signal, and a signal summing point at the transmitter input, are available. An internally preset line length compensation can be adjusted with external resistors to fit into different current feed systems as for ex. 48 V, 2 x 200 ohms, 48 V, 2 x 400 ohms and 48 V, 2 x 800 ohms. The line length compensation can be shut off in either high or low gain mode.