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Addressing ClassA and ClassB Marine AIS

The NEW CMX910 gives global designers of Marine Automatic Identification Systems (AIS), a helping hand in their quest to develop low-cost Class-A and Rx only Class-B solutions, for both commercial and leisure maritime vessels, of all sizes.



The CMX910 is a highly integrated baseband signalling processor IC, providing all of the required baseband processing, control and data formatting/unformatting. This clever integration reduces component-count, which further reduces board size, enabling even the smallest of AIS units to be conceived, particularly useful for OEM integrated solutions.



Designed as an ultra-low-power IC (3.0V), many of the CMX910's8217;s on-chip functions can be powersaved when not actively required. This innovative feature allows inter-slot powersaving to the Rx and/or Tx channels when not required in the operating cycle.



Half duplex in operation, the CMX910 comprises two I and Q Rx paths, and one Tx path, configurable for AIS or FSK (DSC) operation. The device performs channel filtering and signal modulation/demodulation, along with associated AIS functions such as training sequence detection, NRZI conversion and HDLC processing (flags, bit stuffing/de-stuffing, CRC generation/checking and slot-timing).



A 1200bps FSK demodulator interface provides a third parallel decode path (required by the AIS class A market.), using an external FSK modem. Integrated Rx/Tx data buffers and a slot/sample timer are also provided, all of which greatly reduces the processing requirements of the host micro-controller. The thoughtful provision of a C-BUS controlled interface expansion port, device-enable ports and versatile auxiliary ADCs and DACs, further simplify system hardware design, reducing the overall end-equipment cost and size.



Additionally, a supplementary FSK-only (FX/MX604) receiver can be supported via an external FSK demodulator interfaced to the CMX910. The CMX910 is capable of transmitting on either AIS channel (GMSK 's8211; 9,600bps) or FSK (1200bps) on the DSC channel, as required.



The CMX910 meets International Maritime Authority IMO requirements (IMO-M1371) and IEC61933/IEC62287 standards, for inclusion in a Class-A or Class-B transponder. The CMX910 also supports the expanding Rx only leisure-craft market.



The CMX910 is available now and has a guide price of $10.50. Visit CML's8217;s new Web site for further details: www.cmlmicro.com

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