Communication IC modem CMX469A

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The CMX469A is a CMOS LSI circuit which operates as a full-duplex 1200, 2400 or 4800 baud FFSK Modem. The mark and space frequencies are 1200/1800, 1200/2400 and 2400/4800Hz respectively. Tone frequencies are phase continuous; transitions occur at the zero crossing point. A common Xtal oscillator is employed with a choice of two clock frequencies (1.008MHz or 4.032MHz) to provide baud-rate, transmit frequencies, and Rx and Tx synchronisation. The modem includes circuitry for Carrier Detect and Rx Clock recovery, both of which are made available as output pins. Rx, Tx and Carrier Detect paths contain a bandpass filter to ensure the provision of optimum signal conditions. The CMX469A demonstrates a high sensitivity and good bit-error-rate under adverse signal conditions. This low-power device requires few external components and is available in small outline plastic SOIC and TSSOP packages. Selectable Data Rates: 1200/2400/4800 Baud Full Duplex FFSK Rx and Tx Bandpass Filters Clock Recovery and Carrier Detect Facilities Pin Selectable Xtal/Clock Inputs: – 1.008MHz or 4.032MHz Simple Control: No µP Required Data-Over-Radio PMR and Cellular Radio Signalling Automatic Vehicle Location (Differential GPS) Links Portable Data Terminals Personal/Cordless Telephone Industrial Control Signalling