MM74HC943

更新时间： 2024-09-28 22:57:55

品牌	Logo	应用领域
美国国家半导体 - NSC		调制解调器
页数	文件大小	规格书
8页	155K
描述
300 Baud Modem

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数据手册

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MM74HC943 数据手册

PRELIMINARY

January 1988

MM74HC943 300 Baud Modem

General Description

Features

5V supply

The MM74HC943 is a full duplex low speed modem. It pro-

vides a 300 baud bidirectional serial interface for data com-

munication over telephone lines and other narrow band-

width channels. It is Bell 103 compatible.

Drives 600X at 9 dBm

All filters on chip

Transmit level adjustment compatible with universal

service order code

The MM74HC943 utilizes advanced silicon-gate CMOS

technology. Switched capacitor techniques are used to pe-

form analog signal processing.

TTL and CMOS compatible logic

All inputs protected against static damage

Low power consumption

MODULATOR SECTION

Full duplex answer or originate operation

Analog loopback for self test

The modulator contains a frequency synthesizer and a sine

wave synthesizer. It produces a phase coherent frequency

shift keyed (FSK) output.

Power down mode

LINE DRIVER AND HYBRID SECTION

Applications

The line driver and hybrid are designed to facilitate connec-

tion to a 600X phone line. They can perform two to four wire

conversion and drive the line at a maximum of 9 dBm.

Built-in low speed modems

Remote data collection

Radio telemetry

DEMODULATOR SECTION

Credit verification

The demodulator incorporates anti-aliasing filters, a receive

filter, limiter, discriminator, and carrier detect circuit. The

nine-pole receive filter provides 60 dB of transmitted tone

rejection. The discriminator is fully balanced for stable

operation.

Stand-alone modems

Point-of-sale terminals

Tone signaling systems

Remote process control

Connection and Block Diagrams

Dual-In-Line Package

TL/F/5349–1

Order Number MM74HC943

TL/F/5349–2

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/5349

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7 8

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