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參數(shù)資料
| 型號(hào)： | L3281AB |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW VOLTAGE TELEPHONE SPEECH CIRCUITS |
| 中文描述： | 低壓電話語音電路 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 170K |
| 代理商： | L3281AB |
CIRCUIT DESCRIPTION
TWOTO FOUR WIRE CONVERSION
The L3281AB is based on a Wheastone bridge
configuration. To balance the bridge the following
relation mustbe satisfied:
ZI / /
Zm
Zb
=
R2
R3
The AC signal from the microphone is sent to one
diagonalof the bridge (pins 1 and 3). A small per-
centage of the signal power is lost on Zb (being
Zb > (Zm//Zi)); the main part is sent to the line via
R2.
In receiving mode, the AC signal coming from the
LINE is sensed across the seconddiagonal of the
bridge (pins 12 and 2).
The impedanceZm and Zb can be complex.
LOGIC OF MUTE SWITCHING
MUTE
LOW
(DIAL)
OPEN
(SPEECH)
DTMF
BEEP
MIC IMP
MUTED
RX IMP
MUTED
ACTIVE TO LINE
OUTPUT
ACTIVE TO LINE
OUTPUT
ACTIVETO EARPHONE
OUTPUT
ACTIVETO EARPHONE
OUTPUT
ACTIVE
ACTIVE
Figure4:
2/4 WireConversion
L3281
5/10
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