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XR-2121

Exar
Part Number XR-2121
Manufacturer Exar
Description Bell 212A Type Modulator
Published Apr 5, 2018
Detailed Description XR-2121 Bell 2 12A Type Modulator GENERAL DESCRIPTION The, XR-2121 is designed to provide the complete modulator func...
Datasheet PDF File XR-2121 PDF File

XR-2121
XR-2121

Overview
XR-2121 Bell 2 12A Type Modulator GENERAL DESCRIPTION The, XR-2121 is designed to provide the complete modulator function for a Bell 212A type modem.
The circuit accepts a synchronous serial data stream and generates either a 300 BPS frequency shift keyed (FSK) or a 1200 BPS differential phase shift keyed (DPSK) carrier signal.
An on-board digital-to-analog converter provides a synthesized sine wave output.
Also provided on the transmitted carrier output is an inverting amplifier with external feedback resistor to provide a carrier amplitude adjust.
The XR-2121 contains an internal 17 bit scrambler.
This scrambler which is used during DPSK operation has a disable input for sending non-scrambled carriers.
A 1200 Hz transmit clock output is provided for 1200 BPS operation, although the XR-2121 will also accept an external transmit clock.
For test or other purposes, a 600 Hz baud clock output is also supplied.
The XR-2121 is constructed using silicon gate CMOS technology.
The main c...


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