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PDF L3281 Data sheet ( Hoja de datos )

Número de pieza L3281
Descripción LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
Fabricantes STMicroelectronics 
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L3281
LOW VOLTAGE TELEPHONE SPEECH CIRCUITS
PRELIMINARY DATA
OPERATION DOWN TO 1.6V / 6.5mA
DTMF & BEEP TONE INPUTS
EXTERNAL MUTING FOR EARPHONE AND
MICROPHONE
SUITABLE FOR DYNAMIC EARPHONE AND
DYNAMIC OR ELECTRET MICROPHONE
AGC CONTROL ON BOTH SENDING AND
RECEIVING
DIP14
SO14
DESCRIPTION
The L3281 is an electronic speech circuit devel-
oped to replace hybrid circuits in telephone sets
that can be operated in parallel with other
phones.
BLOCK DIAGRAM
ORDERING NUMBERS:
L3281AB
L3281AD1
June 1993
1/10
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

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L3281 pdf
LOGIC OF MUTE SWITCHING
MUTE
LOW
(DIAL)
OPEN
(SPEECH)
DTMF
ACTIVE TO LINE
OUTPUT
ACTIVE TO LINE
OUTPUT
BEEP
ACTIVE TO EARPHONE
OUTPUT
ACTIVE TO EARPHONE
OUTPUT
MIC IMP
MUTED
ACTIVE
L3281
RX IMP
MUTED
ACTIVE
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 = R2
Zb R3
Figure 4: 2/4 Wire Conversion
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.
5/10

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