CAMBRIDGE, UK The CMX885 Marine VHF baseband processor from CML Microcircuits is designed to meet the global requirements of low cost, highly integrated marine VHF transceivers by offering complete audio processing with selectable audio processing order.
The chip is a complete marine world audio and signalling solution with in-band signalling capabilities including DSC, ATIS, DTMF, NWR WAT and SAME. The CMX885's embedded functionality also allows a very small, low power, low cost host microcontroller to be use as part of the overall marine VHF transceiver system.
Features include digital gain control, pre- and de-emphasis, filtering, soft limiting and voice scrambling options. Suitable for both portable and fixed mobile transceivers, the CMX885 uses dual Rx channel operation for DSC class D conformance.
The product also boasts a 1200bps Digital Selcall (DSC) modem with protocol support and an Automatic Transmitter Identification System (ATIS) modem, as well as NOAA weather radio decoding support.
A full compliment of auxiliary ADCs, DACs and dual synthesised clocks is included in this low power marine VHF processor. A minimum of external components is required for the device that also offers flexible powersaving modes.
The device operates between 3.0 and 3.6V and is available in 48-pin VQFN and LQFP packages. For designers wishing to evaluate the product, and reduce their design time, an evaluation kit (EV8850) is available from CML.