AM79489 Просмотр технического описания (PDF) - Unspecified

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AM79489

Subscriber Line Interface Circuit

Unspecified 

Am79489

Subscriber Line Interface Circuit

DISTINCTIVE CHARACTERISTICS

Ideal for low power sensitive applications

Low standby power (normal and reverse)

Automatic on-chip battery switching

On-chip thermal management

On-chip thermal shutdown

–20 V to –60 V battery operation

Programmable current limit

Programmable resistive feed

Programmable loop-detect threshold

Selectable overhead for metering applications

Two-wire impedance set by single external

impedance

On-chip ring and test relay drivers and relay

snubber circuits

Polarity reversal (full transmission)

Loop and ground-key detector

Comparator for ring-trip detection

Ground-start capability

On-hook transmission

BLOCK DIAGRAM

TMG

DA

DB

A(TIP)

HPA

HPB

Two-Wire

Interface

Ring-Trip

Comparator

Ground-Key

Detector

Loop Detector

B(RING)

VBAT2

VBAT1

BGND

Switch Control

Signal

Transmission

Power-Feed

Controller

Test Relay

Driver

Ring Relay

Driver

Input

Decoder

and

Control

TESTOUT

RINGOUT

C1

C2

C3

C4

E1

DET

RD

VTX

RSN

RDC

CAS

OVH

RFA

BSWOUT BSWEN BSWTH

VCC

AGND/DGND

Publication# 080201 Rev: E Amendment: /0

Issue Date: October 1999

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