U3761MB Datasheet, PDF (6/23 Pages) TEMIC Semiconductors – Low Voltage Standard Telephone Circuit with 13 Memories

U3761MB
SDIP40 SSO44
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Symbol
RDC
TIN
V_I
MUTE
VBG
RECIN
RECO1
RECO2
Configuration
AGC
ÊÊVL
RDC
TIN
PD
PD
1V
ÊÊ 5.6K
ÊÊ _16V
ÊÊ _PD
Ê
VI
16V
PD
MUTE
VBG
REC _IN
6.7V
PD
6.7V
PD
Ê ^30K
VBG
MUTE
ÊÊÊ^VL
60K
Ê
RECO2
RECO1
Ê ÊVL
Ê ÊÊ_{60K 1V}
Function
An external resistor (1 W) is
required from this pin to GND to
control the DC input impedance of
the circuit. It has a nominal value
W of 39 for low-voltage operation.
W Values up to 100 may be used to
increase the available transmit
output voltage swing at the expense
of low-voltage operation.
Input to the line output driver am-
plifier. Transmit AGC applied to
this stage.
This internal voltage bias line must
be connected to VL via an external
resistor, R_B, which dominates the
W ^{AC input impedance of the circuit}
and should be 680 Ω for an 600
input impedance or 1.2 kΩ for a
900 Ω input impedance.
Pin for testing
Pin for test mode
Receive amplifier input. The
receiving amplification is regulated
by an AGC.
Output of the receive amplifier.
Dynamic transducers with a
W minimum impedance of 100 can
be directly driven by these outputs.
RECO2
RECO1
6.7V
ÊÊ ^PD
ÊVL
ÊÊ_{60K 1V}
6.7V
PD
6 (23)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A2, 23-Apr-97