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AM79484-2JC
Am79484 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS Low standby power (45 mW) –40 V to –58 V battery operation On-hook transmission Tip Open state for ground-start lines Two-wire impedance set by single external impedance Ideal for long-loop applications Programmable constant-current feed Programmable loop-detect threshold Current gain = 200 Polarity reversal option available On-chip Thermal Management (TMG) feature On-chip ring and test relay driver and relay snubber circuits BLOCK DIAGRAM TMG DA DB Relay Driver Ring Relay Driver A(TIP) HPA Ring-Trip Detector Two-Wire Interface HPB Ground-Key Detector Off-hook Detector TESTOUT RINGOUT Input Decoder and Control C1 C2 C3 C4 E1 E0 DET RD B(RING) Signal Transmission Power-Feed Controller VTX RSN RDC CAS VBAT BGND VCC VNEG AGND/DGND Publication# 080180 Rev: C Amendment: /0 Issue Date: May 1999
AMD
Advanced Micro Devices, Inc
U.S.A
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