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參數資料
| 型號： | LS256D |
| 廠商： | 意法半導體 |
| 英文描述： | TELEPHONE SPEECH CIRCUIT WITH MULTIFREQUENCY TONE GENERATOR INTERFACE |
| 中文描述： | 電話語音電路的多頻音調發生器接口 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 84K |
| 代理商： | LS256D |
LS256
November 1996
TONEGENERATOR INTERFACE
TELEPHONE SPEECH CIRCUITWITH MULTIFREQUENCY
.
PRESENTSTHEPROPERDCPATHFORTHE
LINECURRENT
.
HANDLES THE VOICE SIGNAL, PERFORM-
ING THE 2/4 WIRES INTERFACE
AND
CHANGING THE GAIN ON BOTH SENDING
AND RECEIVING AMPLIFIERS TO COMPEN-
SATEFOR LINEATTENUATION BYSENSING
THELINELENGTHTHROUGHTHELINECUR-
RENT
.
ACTSASLINEARINTERFACE FORMF, SUP-
PLYINGA STABILIZEDTOTHEDIGITALCHIP
AND DELIVERING TO THE LINE THE MF
TONEGENERATEDBYTHE DIALER
DESCRIPTION
The LS256 is a monolithic integratedcircuit in 16-
lead dual in-line and SO20 plastic packages to re-
placethehybridcircuitintelephoneset.Itworkswith
the same type of transdurcers for both transmitter
and receiver (typically piezoceramic capsules, but
DIP16
ORDERING NUMBERS :
LS256B
LS256D
thedevicecan workalsowith dynamicones).Many
of its electrical characteristics can be controlled by
means of external components to meet different
specifications.
In additionto thespeechoperation,theLS256acts
as an interfacefor theMF tonesignal.
PIN CONNECTIONS
(top view)
DIP16
SO20
N.C.
MIC. INPUT
+LINE
MUTING
BIAS ADJ.
DC. REGULATOR
SHUNT REG. BYPASS
LINE CURRENT SENSING
GAIN CONTROL
-LINE
INPUT-(REC.AMP.)
INPUT+(REC.AMP.)
RECEIVER OUTPUT
RECEIVER OUTPUT
MF INPUT
V
DD
MIC. INPUT
N.C.
1
3
2
4
5
6
7
8
9
18
17
16
15
14
12
13
11
19
10
20
N.C.
N.C.
D96TL274
SO20
1/8
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