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AM79R79-3JC
Am79R79*/Le79R79 Ringing Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS I Ideal for short-loop applications I Programmable constant-current feed I Ideal for ISDN terminal adaptor and fixed radio access applications I Programmable Open Circuit voltage I On-chip ringing with on-chip ring-trip detector I Current gain = 1000 I Low standby state power I Programmable loop-detect threshold I Ground-key detector I Battery operation: — VBAT1: –40.5 V to –75 V I Tip Open state for ground-start lines I Polarity reversal option available I On-chip battery switching and feed selection I Internal VEE regulator (no external –5 V power supply required) I On-hook transmission I Two on-chip relay drivers and snubber circuits I Two-wire impedance set by single external impedance I Space Saving Package Options (8x8 QFN) — VBAT2: –19 V to VBAT1 BLOCK DIAGRAM Relay Driver RTRIP1 RTRIP2 RYOUT2 RYE Relay Driver A(TIP) Ring-Trip Detector Input Decoder and Control Ground-Key Detector HPA Two-Wire Interface RYOUT1 D1 D2 C1 C2 C3 Off-Hook Detector E1 DET Signal Transmission RD VTX RSN HPB B(RING) RINGIN RDC RDCR Power-Feed Controller VBAT2 RSGL RSGH B2EN Switch Driver VBAT1 VCC VNEG BGND AGND/DGND *This product can be ordered using ordering part numbers Am79R79 or Le79R79. The Am79R79 ordering part number will be discontinued after 6/30/02, at which time the product will only be available using the Le79R79 ordering part number. Document ID# 080152 Date: Rev: I Version: Distribution: Public Document Mar 25, 2002 1
AMD
Advanced Micro Devices, Inc
U.S.A
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