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LS256

TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY

TONE GENERATOR INTERFACE

.

.

.

PRESENTS THE PROPER DC PATH FOR THE

LINE CURRENT

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

THELINE LENGTHTHROUGH THE LINE CUR-

RENT

ACTS AS LINEAR INTERFACE FOR MF, SUP-

PLYING A STABILIZEDTO THE DIGITAL CHIP

AND DELIVERING TO THE LINE THE MF

TONE GENERATED BY THE DIALER

DIP16

SO20

ORDERING NUMBERS :

LS256B

LS256D

DESCRIPTION

The LS256 is a monolithic integrated circuit in 16-

lead dual in-line and SO20 plastic packages to re-

placethe hybridcircuit in telephoneset.It workswith

the same type of transdurcers for both transmitter

and receiver (typically piezoceramic capsules, but

PIN CONNECTIONS

(top view)

the device can work also with dynamic ones). Many

of its electrical characteristics can be controlled by

means of external components to meet different

specifications.

In addition to the speech operation, the LS256 acts

as an interface for the MF tone signal.

N.C.

MIC. INPUT

+LINE

MUTING

BIAS ADJ.

SHUNT REG. BYPASS

DC. REGULATOR

LINE CURRENT SENSING

GAIN CONTROL

N.C.

1

2

3

4

5

6

7

8

9

10

D96TL274

20

19

18

17

16

15

14

13

12

11

N.C.

MIC. INPUT

V

DD

MF INPUT

RECEIVER OUTPUT

RECEIVER OUTPUT

INPUT+(REC.AMP.)

INPUT-(REC.AMP.)

-LINE

N.C.

SO20

DIP16

November 1996

1/8

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LS256D相關型號PDF文件下載

• 型號
  版本
  描述
  廠商
  下載
• LS256
  英文版
  TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR ...
  
  LS256
• LS256
  英文版
  TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR ...
  STMICROELECTRON...
  LS256
• LS25-5
  英文版
  AC/DC CONVERTER 5V 25W
  LS25-5
• LS256B
  英文版
  TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR ...
  
  LS256B
• LS256B
  英文版
  TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR ...
  STMICROELECTRON...
  LS256B
• LS256D
  英文版
  TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR ...
  
  LS256D
• LS256D
  英文版
  TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR ...
  STMICROELECTRON...
  LS256D
• LS25-12
  英文版
  AC/DC CONVERTER 12V 25W
  LS25-12
• LS25-15
  英文版
  AC/DC CONVERTER 15V 25W
  LS25-15
• LS25-24
  英文版
  AC/DC CONVERTER 24V 25W
  LS25-24
• LS25-36
  英文版
  AC/DC CONVERTER 36V 25W
  LS25-36
• LS25-48
  英文版
  AC/DC CONVERTER 48V 25W
  LS25-48
• LS25-3.3
  英文版
  AC/DC CONVERTER 3.3V 25W
  LS25-3.3
• LS2540-7R
  英文版
  100 Watt AC-DC Converters
  
  LS2540-7R
• LS2540-7R
  英文版
  100 Watt AC-DC Converters
  POWER-ONE ...
  LS2540-7R

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