u3762mb ETC-unknow, u3762mb Datasheet - Page 6

• Manufacturer Part Number: u3762mb
• Description: Universal Telephone Functions Integrated
• Manufacturer: ETC-unknow

U3762MB
6 (23)
Pin
19
20
21
22
23
24
25
26
27
28
29
Symbol
RECO2
RECO1
VRIAC
PRIND
RECIN
MUTE
CLIM
THA
AGC
ST
V
I
Time constant of anticlipping in transmit path.
This internal voltage bias line must be con-
nected to VL via an external resistor which
dominates the AC input impedance of the cir-
cuit and should be 680
impedance or 1.2 k for a 900- input im-
pedance.
Pin for testing
PRIVACY indication pin
Open collector with minimum 1 mA drive
current to GND when PRIVACY = active
Receive amplifier input. The receiving ampli-
fication is regulated by an AGC.
Output of the receive amplifier. Dynamic
transducers with a minimum impedance of
100
CLIM
CLIM = GND: anticlipping inactive
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.
Ringer threshold adjustment
The range of transmit and receive gain varia-
tions between short and long loops may be
adjusted by connecting a resistor R
this pin to (GND). This pin can be left open to
set AGC out of action.
Ringing supply
W
w
can be directly driven by these outputs.
2.2
m
Preliminary Information
F
Function
for an 600-
AGC
W
input
from
RECO2
RECO1
MUTE
AGC
RDC
VRIAC
CLIM
THA
PRIND
RECIN
ST
VI
PD
Configuration
PD
VRIAC
PD
6V
6V
PD
PD
Ê
Ê
PD
50V
PD
6.7V
12K
6.7V
6V
PD
16V
PD
16V
Ê
Ê
Rev. A1, 15-Sep-98
6.7V
60K
20K
140K
70K
10K
30K
Ê
Ê
Ê
Ê
Ê Ê
60K
VL
MUTE
VL
VL
Ê
Ê
Ê
Ê
Ê
Ê
1V
VBG
IDC
PD
1V
VL
Ê