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AM79R70 Scheda tecnica(PDF) 1 Page - Advanced Micro Devices |
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AM79R70 Scheda tecnica(HTML) 1 Page - Advanced Micro Devices |
1 / 17 page This document contains information on a product under development at Advanced Micro Devices. The information is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice. Publication# 21776 Rev: B Amendment: /0 Issue Date: July 1998 PRELIMINARY Am79R70 Ringing Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS s Ideal for ISDN-TA and set top applications s On-chip ringing with on-chip ring-trip detector s Low standby state power s Battery operation: —VBAT1: –40 V to –67 V —VBAT2: –19 V to VBAT1 s On-chip battery switching and feed selection s On-hook transmission s Polarity reversal option s Programmable constant-current feed s Programmable Open Circuit voltage s Programmable loop-detect threshold s Current gain = 1000 s Two-wire impedance set by single component s Ground-key detector s Tip Open state for ground-start lines s Internal VEE regulator (no external –5 V power supply required) s Two on-chip relay drivers and snubber circuits BLOCK DIAGRAM E1 D2 D1 Two-Wire Interface HPA HPB Input Decoder and Control Relay Driver Ring-Trip Detector Power-Feed Controller RTRIP1 RTRIP2 BGND VCC VNEG RD RDC AGND/DGND VBAT2 A(TIP) B(RING) RYOUT1 RDCR C1 Switch Driver VBAT1 RSGL Ground-Key Detector Off-Hook Detector Relay Driver RYOUT2 C2 C3 RSGH B2EN RSN VTX Signal Transmission RINGIN RYE DET |
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