AM7945
feature s Two-wire impedance set by single external impedance s On-hook transmission s On-chip ring relay driver and relay snubber circuit s Ideal for low cost PABX and key telephone systems
BLOCK DIAGRAM
A(TIP)
B(RING) m o .c U 4 t e e h S a t a .D w w w
TMG Ring Relay Driver Input Decoder and Control Two-Wire Interface Ground-Key Detector Signal Transmission Off-Hook Detector Power-Feed Controller Ring-Trip Detector VCC VEE AGND/DGND
RINGOUT C1 C2 C3 E0 E1 DET
RSN VTX
DA DB VBAT BGND m o .c U 4 t e e h S a at .D w w w
RD RDC CAS
Publication# 18408 Rev: D Amendment: /0 Issue Date: October 1999
ORDERING INFORMATION Standard Products
AMD standard products are available in several packages and operating ranges. The order number (Valid bination) is formed by a bination of the elements below.
C TEMPERATURE RANGE C = mercial (0°C to 70°C)-
PACKAGE TYPE J = 32-pin Plastic Leaded Chip Carrier (PL 032)
DEVICE NUMBER/DESCRIPTION
Am7945 Subscriber Line Interface...
