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Class A and B AIS Baseband Signal Processor

CMX910


Features:
  • Half Duplex GF(M)SK, FSK and DSC Capabilities
  • Flexible Signal Channels:
    - Two Simultaneous Rx
    - One Tx
    - Optional-FSK Interface
  • marine AIS Formatted Data and Raw Data Modes
  • 12.5 and 25 kHz Modes for marine AIS Operation
  • Slot/Sample Counter with UTC Timing Interface
  • I and Q Radio Interface
  • Supports Carrier-Sensing Channel Access (CSTDMA)
  • Auxiliary ADC and DAC Functions
Applications:
  • Marine AIS Class A and Class B Transponders
  • Rx Only AIS Monitors
  • Marine AIS Search and Rescue Transponders (SART)
Supply Requirement:
  • 3.0 to 3.6 V

Designed specifically for all current modes of AIS operation, the CMX910 offers a highly integrated IC capable of performing all of the required data-handling and formatting, timing, distribution and control functions under the control of the host. Provided on-chip are both of the mandated GF(M)SK Rx channels and a single Tx channel.
Selectable to 12.5 and 25 kHz modes for marine AIS, the CMX910 accommodates, in Rx and Tx, both full AIS data packet assembly and dissassembly and a basic ‘raw’ data facility.

Both marine AIS (G(M)FSK) and DSC (FSK) I/Q modulated signalling modes are available.

Integration of all marine AIS functions, including versatile synchronisation and timing and control facilities are available on this single compact IC. Control and interfacing, including upgraded ‘data-streaming’, are via the CML C-BUS serial interface, with a host-controlled expansion port for the addition of other CML (or other) ICs.

A third, parallel (Rx) decode path, accommodates the additional DSC (FSK) signalling from an external modem for Class A marine AIS applications.
With its high integration on-chip of marine AIS-specific functions and wide-ranging data-signal processing capabilities, the CMX910 reduces the final-product board-area requirement and component count whilst drastically reducing the host µC load by minimizing the software generation effort; all with a view to an accelerated time-to-market.
The provision of the C-BUS expansion port, an RF device enabling port and a number of auxiliary ADCs and DACs, simplifies the system hardware implementation, further reducing the overall equipment cost and size.

The use of a single multi-function product offers significant reduction in power requirements.
Requiring a supply input in the range 3.0 to 3.6 volts, the CMX910 is available in both compact 64-pin LQFP and VQFN packages.

Enhancement
To further enhance the CMX910, its Special Command Interface (see section 5.12 of the latest CMX910 data sheet) can be used to reconfigure the CMX910's functionality to fully implement and improve its CS-TDMA reception capability.

Block Diagram

CMX910 Block Diagram

Design Support Information

 
EV9100 Evaluation Kit (rev3) EV9100 Evaluation Kit for the CMX910
 
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