LS656 데이터 시트보기 (PDF) - STMicroelectronics

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LS656

TONE GENERATOR INTERFACE TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY

STMicroelectronics 

LS656

TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY

TONE GENERATOR INTERFACE

. PRESENTS THE PROPER DC PATH FOR THE

. LINE CURRENT, PARTICULAR CARE BEING

PAID TO HAVE LOW VOLTAGE DROP

HANDLES THE VOICE SIGNAL, PERFORM-

ING THE 2/4 WIRES INTERFACE AND

CHANGING THE GAIN ON BOTH SENDING

AND RECEIVING AMPLIFIERS TO COMPEN-

SATE FOR LINE ATTENUATION BY SENSING

EITHER THE LINE CURRENT OR THE LINE

. VOLTAGE. IN ADDITION, THE LS656 CAN

ALSO WORK IN FIXED GAIN MODE

ACTS AS LINEAR INTERFACE FOR MF, SUP-

PLYING A STABILIZED VOLTAGE TO THE

DIGITALCHIP AND DELIVERING TO THE LINE

THE MF TONES GENERATED BY THE M761

DES CRI P TI O N

DIP16

SO20L

ORDERING NUMBERS : LS656AB (DIP16)

LS656AD1 (SO20)

The LS656 is a monolithic integrated circuit in 16-

lead plastic package to replace the hybrid circuit in

telephone set. It works with the same type of

transducers for both transmitter and receiver (typi-

cally dynamic capsules). Many of its electrical char-

acteristics can be controlled by means of external

components to meet different specifications.

In addition to the speech operation, the LS656 acts

as an interface for the MF tonesignal (particularly for

M761 C/MOS frequency synthesizer).

BLOCK DIAGRAM (DIP16)

June 1993

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