U3760MB Datasheet, PDF (6/19 Pages) TEMIC Semiconductors – Low-Voltage Standard Telephone Circuit

U3760MB
SDIP40 SSO44
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Symbol
Function
MUTE Pin for testing
VBG Pin for test mode
RECIN Receive amplifier input. The
receiving amplification is regulated
by an AGC.
MUTE
Configuration
6.7V
PD
Ê ^30K
VBG
MUTE
Ê^VL
VBG
Ê
6.7V
PD
Ê
60K
RECIN
22
24 RECO1 Output of the receive amplifier.
W ^{Dynamic transducers with a}
minimum impedance of 100 can _RECO2
21
23
RECO2 ^{be directly driven by these outputs. RECO1}
23
25 PRIVACY Input for handset mute
Ê
6.7V
PD
Ê
VL
ÊÊÊ_{60K 1V}
Ê^VI
PRIVACY
6V
6V
40K
Ê^0.6V
PD
24
26
ST The output of the sidetone
cancellation signal, which requires
a balanced impedance of 8 to
10 times the subscriber’s line
impedance to be connected to
Pin VL.
ST
Ê
16V
PD
25
27
THA Ringer threshold adjustment
THA
ÊVRIAC
12K
6V
ÊÊ 140K
1V
20K
26
28
AGC The range of transmit and receive
6V
PD
Ê^VL
gain variations between short and
long loops may be adjusted by
AGC
connecting a resistor R_AGC from
this pin to (GND). This pin can be
left open to set AGC out of action.
PD
RDC
PD
27
29 VRIAC Ringing supply
VRIAC
50V
PD
ÊÊÊ ^70K
10K
6 (19)
Rev. A3, 19-Feb-98