U3761MB Datasheet, PDF (7/23 Pages) TEMIC Semiconductors – Low Voltage Standard Telephone Circuit with 13 Memories

U3761MB
SDIP40 SSO44 Symbol
23
25 PRIVACY
Configuration
Ê Ê^VI
Function
Input for handset mute
PRIVACY
6V
6V
40K
Ê^0.6V
PD
24
26
ST
ST
Ê
16V
PD
The output of the sidetone
cancellation signal, which requires
a balanced impedance of 8 to
10 times the subscribers line
impedance to be connected to
Pin VL.
25
27
THA
THA
ÊVRIAC
12K
6V
Ringer threshold adjustment
ÊÊÊ 140K
1V
20K
26
28
AGC
6V
PD
AGC
PD
RDC
ÊÊVL The range of transmit and receive
gain variations between short and
long loops may be adjusted by
connecting a resistor R_AGC from
this pin to (GND). This pin can be
left open to set AGC out of action.
PD
27
29 VRIAC
VRIAC
50V
70K
10K
ÊÊ ^{Ringing supply}
PD
28
30 VRING
VRING
30V
PD
6.5K
DC supply voltage for the tone
ringer is limited to 30 V with
200 integrated Z-diode.
OUT
29
31
RCK
ÊÊÊÊÊ ^50V
PD
3.4V
0.8V
RC clock oscillator for ringer
RCK
6V
6V
PD
TELEFUNKEN Semiconductors
7 (23)
Rev. A2, 23-Apr-97
Preliminary Information