AM7945

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) HPA HPB 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 Combination) is formed by a combination of the elements below. Am7945 J C TEMPERATURE RANGE C = Commercial (0°C to 70°C)* PACKAGE TYPE J = 32-pin Plastic Leaded Chip Carrier (PL 032) DEVICE NUMBER/DESCRIPTION Am7945 Subscriber Line Interface Circuit Valid Combinations Am7945 JC Valid Combinations Valid Combinations list configurations planned to be supported in volume f...