MM74HC942N

更新时间： 2024-11-19 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	149K
描述
MM74HC942 is a full duplex low speed modem

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数据手册

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MM74HC942N 数据手册

January 1988

MM74HC942 300 Baud Modem

General Description

Features

Drives 600X at 0 dBm

The MM74HC942 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.

All filters on chip

Transmit level adjustment compatible with universal

service order code

The MM74HC942 utilizes advanced silicon-gate CMOS

technology. Switched capacitor techniques are used to per-

form analog signal processing.

TTL and CMOS compatible logic

All inputs protected against static damage

5V supplies

Low power consumption

MODULATOR SECTION

Full duplex answer or originate operation

Analog loopback for self test

Power down mode

The modulator contains a frequency synthesizer and a sine

wave synthesizer. It produces a phase coherent frequency

shift keyed (FSK) output.

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 0 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 signalling systems

Remote process control

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

Connection and Block Diagrams

Dual-In-Line Package

TL/F/5348–1

Top View

Order Number MM54HC942 or

MM74HC942

TL/F/5348–2

1995 National Semiconductor Corporation

TL/F/5348

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

12 3 4 5 6 7 8

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