The MM74HC942 by National is a MM74HC942 is a full duplex low speed modem. Below is the official datasheet preview.
| Part number | MM74HC942 |
|---|---|
| Manufacturer | National |
| File Size | 146.60 KB |
| Description | MM74HC942 is a full duplex low speed modem |
| Datasheet |
 MM74HC942_NationalSemiconductor.pdf
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The MM74HC942 is a full duplex low speed modem It provides a 300 baud bidirectional serial interface for data communication over telephone lines and other narrow bandwidth channels It is Bell 103 compatible 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
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