DESCRIPTION
The 73M223 modem device receives and transmits serial and binary data over existing telephone networks using Frequency Shift Keying (FSK). It provides the filtering, modulation, and demodulation to implement a serial, asynchronous data communication channel. The 73M223 employs the CCITT V.23 signaling frequencies of 1302 and 2097 Hz, operating at 1200 baud, and is intended for half duplex operation over a two-line system.

FEATURES
• Low cost FSK Modem
• 1200 baud operation
• CMOS switched capacitor technology
• Built-in self-test feature
• On-chip filtering, and Modulation/Demodulation
• Uses CCITT V.23 frequencies
• On chip crystal oscillator
• Low power/High reliability
• Does not require a microprocessor
• 10 mW @ 5 V supply
• 16-pin plastic packages