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AM7943-2JC
Am7943 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS Low power Standby state Performs polarity reversal Ground-key detector Tip Open state for ground-start lines On-hook transmission Programmable loop-detect threshold –19 V to –58 V battery operation Current gain = 200 Programmable constant-current feed On-chip Thermal Management (TMG) feature Two-wire impedance set by single external impedance On-chip ring relay driver and relay snubber circuit Ideal for DLC and PABX applications BLOCK DIAGRAM TMG Ring Relay Driver RINGOUT C1 A(TIP) C2 Input Decoder and Control Ground-Key Detector HPA HPB C3 E0 E1 Two-Wire Interface DET RSN Signal Transmission VTX Off-Hook Detector RD B(RING) DA DB VBAT Power-Feed Controller RDC CAS Ring-Trip Detector BGND VCC VEE AGND/DGND Publication# 080136 Rev: D Issue Date: October 1999 Amendment: /0
AMD
Advanced Micro Devices, Inc
U.S.A
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