U3761MB-T ATMEL [ATMEL Corporation], U3761MB-T Datasheet - Page 8

• Manufacturer Part Number: U3761MB-T
• Description: Universal Telephone IC - All Functions Integrated
• Manufacturer: ATMEL [ATMEL Corporation]

Pin Description
8
Pin
27
28
29
30
31
U3761MB-T
Symbol Function
VRING
VRIAC
AGC
RCK
THA
Ringer threshold adjustment
The range of transmit and receive gain variations between
short and long loops may be adjusted by connecting a
resistor R
open to set AGC out of action.
Ringing supply
DC supply voltage for the tone ringer is limited to 30 V with
integrated Z-diode.
RC clock oscillator for ringer
AGC
from this pin to (GND). This pin can be left
AGC
VRING
RDC
VRIAC
THA
OUT
RCK
PD
PD
PD
PD
PD
Configuration
VRIAC
6 V
6 V
30 V
50 V
50 V
6 V
6 V
12K
PD
3.4 V
6.5K
140K
20K
10K
70K
4744A–CORD–09/03
0.8 V
200
PD
1 V
VL