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CML processor IC tailored for marine AIS apps

Posted: 28 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:cml microcircuits? baseband signaling processor ic? processor ic? automatic identification system? ais?

CML Microcircuits released a highly integrated baseband signaling processor IC for class A and class B marine Automatic Identification System (AIS) applications.

According to the company, the new CMX910 kick-starts the market for a new wave of low-cost marine AIS products. The device allows simple no-fuss design-in, reducing component count, minimizing board size, operating at an ultra-low voltage and designed to work with any AIS system. Additionally, it provides all of the required baseband processing, control and data formatting/unformatting.

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 chip 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 reduces the processing requirements of the host microcontroller. In addition, the 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). 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 or FSK on the DSC channel, as required.

As a low-power IC, many of the CMX910's on-chip functions can be powersaved when not actively required. This feature even allows inter-slot powersaving to the Rx and/or Tx channels when not required in the operating cycle, added CML.

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