MM74HC942N datasheet(1/8 Pages) NSC

Numer części	MM74HC942N

Szczegółowy opis	MM74HC942 is a full duplex low speed modem

PDF	8 Pages

Scroll/Zoom	100%

Producent	NSC [National Semiconductor (TI)]

Strona internetowa	http://www.national.com

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TLF5348

January 1988

MM74HC942 300 Baud Modem

General Description

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

The MM74HC942 utilizes advanced silicon-gate CMOS

technology Switched capacitor techniques are used to per-

form analog signal processing

MODULATOR SECTION

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

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

DEMODULATOR SECTION

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

Features

Y

Drives 600X at 0 dBm

Y

All filters on chip

Y

Transmit level adjustment compatible with universal

service order code

Y

TTL and CMOS compatible logic

Y

All inputs protected against static damage

Y

g

5V supplies

Y

Low power consumption

Y

Full duplex answer or originate operation

Y

Analog loopback for self test

Y

Power down mode

Applications

Y

Built-in low speed modems

Y

Remote data collection

Y

Radio telemetry

Y

Credit verification

Y

Stand-alone modems

Y

Point-of-sale terminals

Y

Tone signalling systems

Y

Remote process control

TRI-STATE

is a registered trademark of National Semiconductor Corp

Connection and Block Diagrams

Dual-In-Line Package

TLF5348 – 1

Top View

Order Number MM54HC942 or

MM74HC942

TLF5348 – 2

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A

Podobny numer części - MM74HC942N

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National Semiconductor ...	MM74HC943	153Kb / 8P	300 Baud Modem
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