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MM74HC943 Datasheet

  • MM74HC943

  • National Semiconductor [300 Baud Modem]

  • 155.48KB

  • NSC

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MM74HC943 300 Baud Modem
PRELIMINARY
January 1988
MM74HC943 300 Baud Modem
General Description
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
The MM74HC943 utilizes advanced silicon-gate CMOS
technology Switched capacitor techniques are used to pe-
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
b
9 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
Y
Y
Y
Y
Y
Y
Y
Y
Y
5V supply
Drives 600X at
b
9 dBm
All filters on chip
Transmit level adjustment compatible with universal
service order code
TTL and CMOS compatible logic
All inputs protected against static damage
Low power consumption
Full duplex answer or originate operation
Analog loopback for self test
Power down mode
Applications
Y
Y
Y
Y
Y
Y
Y
Y
Built-in low speed modems
Remote data collection
Radio telemetry
Credit verification
Stand-alone modems
Point-of-sale terminals
Tone signaling systems
Remote process control
Connection and Block Diagrams
Dual-In-Line Package
TL F 5349鈥?
Order Number MM74HC943
TL F 5349 鈥?2
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 5349
RRD-B30M105 Printed in U S A

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