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AM7949-3JC
Am7949 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS n Ideal for Fiber-In-The-Loop (FITL) applications n Low standby power n –21 V to –58 V battery operation n On-chip battery switching and feed selection n On-hook transmission n Two-wire impedance set by single external n n n n n n n impedance Programmable constant-current feed Current gain = 200 Programmable loop-detect threshold Ground-key detector Tip Open state for ground-start lines Polarity reversal option On-chip ring relay driver and relay snubber circuit BLOCK DIAGRAM Ring Relay Driver A(TIP) RINGOUT C1 C2 HPA Input Decoder and Control C3 Ground-Key Detector Two-Wire Interface E1 DET HPB VTX Signal Transmission RSN Off-Hook Detector B(RING) RD Power-Feed Controller DA RDC CAS Ring-Trip Detector DB TESTIN VBAT2 BSW Test Relay Driver Switch Driver TESTOUT VBAT1 B2EN AS VCC VEE BGND AGND/DGND Publication# 080143 Rev: D Amendment: /0 Issue Date: October 1999
AMD
Advanced Micro Devices, Inc
U.S.A
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