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AM79R79-1JC
Am79R79 Ringing Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS On-chip ringing with on-chip ring-trip detector Low standby state power Battery operation: — VBAT1: –40.5 V to –75 V — VBAT2: –19 V to VBAT1 On-chip battery switching and feed selection On-hook transmission Two-wire impedance set by single external impedance Programmable constant-current feed Ideal for ISDN terminal adaptor and fixed radio access applications Ideal for short-loop applications Two on-chip relay drivers and snubber circuits (32 PLCC) Programmable Open Circuit voltage Programmable loop-detect threshold Current gain = 1000 Ground-key detector Tip Open state for ground-start lines Polarity reversal option available Internal VEE regulator (no external –5 V power supply required) 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) Power-Feed Controller RINGIN RDC RDCR VBAT2 RSGL RSGH B2EN Switch Driver VBAT1 VCC VNEG BGND AGND/DGND Publication# 080152 Rev: H Amendment: /0 Issue Date: August 2001
AMD
Advanced Micro Devices, Inc
U.S.A
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