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AM79R70 Datasheet Ringing SLIC

Manufacturer: Advanced Micro Devices

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Datasheet Details

Part number AM79R70
Manufacturer Advanced Micro Devices
File Size 271.22 KB
Description Ringing SLIC
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General Description

The AMD family of subscriber line interface circuit (SLIC) products provide the telephone interface functions required throughout the worldwide market.

AMD SLIC devices address all major telephony markets including central office (CO), private branch exchange (PBX), digital loop carrier (DLC), fiber-in-the-loop (FITL), radio-in-the-loop (RITL), hybrid fiber coax (HFC), and video telephony applications.

The AMD SLIC devices offer support of BORSHT (battery feed, overvoltage protection, ringing, supervision, hybrid, and test) functions with

Overview

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 Relay Driver RTRIP1 RTRIP2 Relay Driver RYOUT2 RYE RYOUT1 D1 D2 C1 C2 C3 E1 DET RD VTX RSN RINGIN RDC RDCR A(TIP) Ring-Trip Detector HPA Two-Wire Interface HPB Signal Transmission B(RING) Power-Feed Controller Ground-Key Detector Off-Hook Detector Input Decoder and Control VBAT2 Switch Driver RSGL RSGH B2EN VBAT1 VCC VNEG BGND AGND/DGND 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.

Key Features

  • including current limiting, on-hook transmission, polarity reversal, tipopen, and loop-current detection. These features allow reduction of linecard cost by minimizing component count, conserving board space, and supporting automated manufacturing. The AMD SLIC devices provide the two- to four-wire hybrid function, DC loop feed, and two-wire supervision. Two-wire termination is programmed by a scaled impedance network. Transhybrid balance can be achieved with an external balance circuit or simpl.

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