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MM74HC943 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM74HC943 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 8 page  TLF5349 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 b9 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 5V supply Y Drives 600X at b9 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 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 signaling systems Y Remote process control Connection and Block Diagrams Dual-In-Line Package TLF5349 – 1 Order Number MM74HC943 TLF5349 – 2 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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