Datasheet > AM7920-1SC

AM7920-1SC

更新时间： 2024-10-27 23:29:55

品牌	Logo	应用领域
其他 - ETC		电信
页数	文件大小	规格书
20页	263K
描述
Telecommunication IC

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中文翻译

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数据手册

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AM7920-1SC 数据手册

Am7920

Subscriber Line Interface Circuit

The Am7920 Subscriber Line Interface Circuit implements the basic telephone line interface functions, and enables

the design of low cost, high performance, POTS line interface cards.

DISTINCTIVE CHARACTERISTICS

Control states: Active, Ringing, Standby,

and Disconnect

Programmable loop-detect threshold

Programmable ring-trip detect threshold

No –5 V supply required

Low standby power (35 mW)

–19 V to –58 V battery operation

On-hook transmission

Current Gain = 500

On-chip Thermal Management (TMG) feature

Two-wire impedance set by single external

impedance

Four on-chip relay drivers and relay snubbers, 1

ringing and 3 general purpose (32 PLCC)

Programmable constant-current feed

BLOCK DIAGRAM

TMG

Relay

RYOUT3

Driver

Relay

RYOUT2

Driver

Relay

Driver

RYOUT1

Ring Relay

Driver

RINGOUT

A(TIP)

HPA

Input Decoder

and Control

Two-Wire

Interface

DET

HPB

VTX

RSN

Signal

B(RING)

Transmission

Off-Hook

Detector

RDC

CAS

Power-Feed

Controller

Ring-Trip

Detector

VBAT

BGND

VCC VBREF AGND/DGND

Publication# 080146 Rev: H Amendment: /0

Issue Date: October 1999

12 3 4 5 6 7...20

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