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L3281AD1 Datasheet

  • L3281AD1

  • LOW VOLTAGE TELEPHONE SPEECH CIRCUITS

  • 10頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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L3281
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
ACTIVE
ACTIVE
MIC IMP
MUTED
RX IMP
MUTED
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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