AM79R79 Datasheet, PDF(1/20 Page) Advanced Micro Devices – Ringing Subscriber Line Interface Circuit

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AM79R79 Datasheet, PDF (1/20 Pages) Advanced Micro Devices – Ringing Subscriber Line Interface Circuit

Am79R79

Ringing Subscriber Line Interface Circuit

DISTINCTIVE CHARACTERISTICS

I Ideal for short-loop applications

I Ideal for ISDN terminal adaptor and fixed radio

access applications

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

I Low standby state power

I Battery operation:

â VBAT1: â40.5 V to â75 V

â VBAT2: â19 V to VBAT1

I On-chip battery switching and feed selection

I On-hook transmission

I Two-wire impedance set by single external

impedance

I Programmable constant-current feed

I Programmable Open Circuit voltage

I Programmable loop-detect threshold

I Current gain = 1000

I Ground-key detector

I Tip Open state for ground-start lines

I Polarity reversal option available

I Internal VEE regulator (no external â5 V power

supply required)

I Two on-chip relay drivers and snubber circuits

(32 PLCC)

BLOCK DIAGRAM

RTRIP1

RTRIP2

A(TIP)

HPA

HPB

B(RING)

VBAT2

VBAT1

Two-Wire

Interface

Switch

Driver

Ring-Trip

Detector

Ground-Key

Detector

Off-Hook

Detector

Signal

Transmission

Power-Feed

Controller

Relay

Driver

Relay

Driver

Input Decoder

and Control

RYOUT2

RYE

RYOUT1

DET

VTX

RSN

RINGIN

RDC

RDCR

RSGL

RSGH

B2EN

VCC VNEG BGND AGND/DGND

Publication# 19752 Rev: G Amendment: /0

Issue Date: October 1999

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