AM79R70SC datasheet(1/20 Pages) AMD

Part #	AM79R70SC

Description	Ringing Subscriber Line Interface Circuit

PDF	20 Pages

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Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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1 / 20 page

Publication# 21776

Rev: D Amendment: /0

Issue Date: October 1999

Am79R70

Ringing Subscriber Line Interface Circuit

DISTINCTIVE CHARACTERISTICS

I Ideal for ISDN-TA and set top applications

I On-chip ringing with on-chip ring-trip detector

I Low standby state power

I Battery operation:

—VBAT1: –40 V to –67 V

—VBAT2: –19 V to VBAT1

I On-chip battery switching and feed selection

I On-hook transmission

I Polarity reversal option

I Programmable constant-current feed

I Programmable Open Circuit voltage

I Programmable loop-detect threshold

I Current gain = 1000

I Two-wire impedance set by single component

I Ground-key detector

I Tip Open state for ground-start lines

I Internal VEE regulator

(no external –5 V power supply required)

I 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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