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L3281 bảng dữ liệu(PDF) 5 Page - STMicroelectronics

tên linh kiện L3281
Giải thích chi tiết về linh kiện  LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
PDF  10 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L3281 bảng dữ liệu(HTML) 5 Page - STMicroelectronics

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CIRCUIT DESCRIPTION
TWO TO FOUR WIRE CONVERSION
The L3281AB is based on a Wheastone bridge
configuration. To balance the bridge the following
relation must be satisfied:
ZI / /
Zm
Zb
= R2
R3
The AC signal from the microphone is sent to one
diagonal of 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 second diagonal of the
bridge (pins 12 and 2).
The impedance Zm and Zb can be complex.
LOGIC OF MUTE SWITCHING
MUTE
DTMF
BEEP
MIC IMP
RX IMP
LOW
ACTIVE TO LINE
ACTIVE TO EARPHONE
MUTED
MUTED
(DIAL)
OUTPUT
OUTPUT
OPEN
ACTIVE TO LINE
ACTIVE TO EARPHONE
ACTIVE
ACTIVE
(SPEECH)
OUTPUT
OUTPUT
Figure 4: 2/4 Wire Conversion
L3281
5/10



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