CMX910 AIS Baseband Processor

Applications
Automatic Identification System (AIS) for Marine Safety
Class A or B AIS Transponders
AIS Rx-only Modules

Brief Description
A highly integrated Baseband Signalling Processor IC, the CMX910 fulfils the requirements of the class A and class B marine Automatic Identification System (AIS) transponder market. The CMX910 is half duplex in operation, comprising two parallel I+Q Rx paths and one Tx path. These are configurable for AIS or DSC operation. The device performs channel filtering and signal modulation/demodulation with associated AIS functions, such as training sequence detection, NRZI conversion and HDLC processing (flags, bit stuffing/de stuffing, CRC generate/check). An external 1200bps FSK demodulator interface provides a third parallel decode path for DSC, as required by the class A market. Integrated Rx/Tx data buffers and a flexible slot/sample timer are also provided, all of which greatly reduce the processing requirements of the host μC. Provision of a C-BUS expansion port, an RF device enable port and a number of auxiliary ADCs and DACs further simplifies the system hardware design, reducing the overall equipment cost and size.