AM7945 datasheet(1/18 Pages) AMD

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Giải thích chi tiết về linh kiện	Subscriber Line Interface Circuit

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Publication# 18408

Rev: D Amendment: /0

Issue Date: October 1999

Am7945

Subscriber Line Interface Circuit

DISTINCTIVE CHARACTERISTICS

s Programmable constant-current feed

s Current gain = 200

s Programmable loop-detect threshold

s Low power Standby state

s Ground-key detector

s Tip Open state for ground-start lines

s –19 V to –56.5 V battery operation

s On-chip Thermal Management (TMG) feature

s Two-wire impedance set by single external

impedance

s On-hook transmission

s On-chip ring relay driver and relay snubber

circuit

s Ideal for low cost PABX and key telephone

systems

BLOCK DIAGRAM

VCC

VEE

AGND/DGND

RSN

VTX

RD

RDC

CAS

C1

C2

C3

E0

E1

DET

Two-Wire

Interface

HPA

HPB

DA

DB

BGND

VBAT

A(TIP)

B(RING)

TMG

Ground-Key

Detector

Signal

Transmission

Off-Hook

Detector

Power-Feed

Controller

Ring-Trip

Detector

RINGOUT

Ring Relay

Driver

Input Decoder

and Control

Số phần tương tự - AM7945

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