Low-Cost, High-Quality Marine AIS Arrives
(PRWEB) November 19, 2004
CML Microcircuits is pleased to announce the introduction of the CMX910 A highly integrated Baseband Signalling Processor IC, for class A and class B marine Automatic Identification System (AIS) applications. The CMX910 reduces component count, minimises board size and operates at an ultra-low voltage.
Half duplex in operation, the CMX910 comprises two parallel I and Q Rx paths, and one Tx path, all 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).
The 1200bps FSK demodulator interface provides the third parallel decode path, using an external FSK modem, required by the AIS class A market. 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 enabled ports and versatile auxiliary ADCs and DACs, further simplify system hardware design, reducing the overall end-equipment cost and size.
The two main receive channels support simultaneous reception of two AIS (GMSK I and Q) channels or one AIS and one FSK (1200baud DSC). Additionally a supplementary FSK-only (FX/MX604) receiver can be supported via an external FSK demodulator interfaced to the CMX910. The CMX910 is also capable of transmitting on either AIS channel (GMSK 9,600bps) or FSK (1200bd) on the DSC channel, as required.
As an ultra-low-power IC, many of the CMX910s on-chip functions can be powersaved when not actively required. This innovative feature even allows inter-slot powersaving to the Rx and/or Tx channels when not required in the operating cycle.
The CMX910 is designed to work with any AIS system, providing all the required baseband processing, control and data formatting/unformatting.
For further information please contact Mark Channen at CML Microcircuits UK Ltd.
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