Datasheet Summary
m o .c Am7945 t4U Subscriber Line eInterface Circuit e h S DISTINCTIVE a CHARACTERISTICS t a D . w w w s Programmable constant-current feed s Current gain = 200 s Programmable loop-detect threshold s Low power Standby state s Ground-key detector s Tip Open state for ground-start lines s
- 19 V to
- 56.5 V battery operation s On-chip Thermal Management (TMG) 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...