MM74HC942 Datasheet | National

MM74HC942 300 Baud Modem January 1988 MM74HC942 300 Baud Modem General Description The MM74HC942 is a full duplex low speed modem It provides a 300 baud bidirectional serial interface for data munication over telephone lines and other narrow bandwidth channels It is Bell 103 patible The MM74HC942 utilizes advanced silicon-gate CMOS technology Switched capacitor techniques are used to perform 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 connection to a 600X phone...