Product description

The CMX885 is a half-duplex, audio, signalling and data processing IC for use in Marine VHF radio systems.

Complete voice-band processing, filtering, pre- or de-emphasis and frequency inversion scrambling. Signal routing and filtering is included to assist host µC based signal encoding/decoding applications.

A 1200bps Digital Selcall (DSC)/Automatic Transmitter Identification System (ATIS) modem with protocol support and National Oceanic and Atmospheric Administration (NOAA) National Weather Radio (NWR) decoding are supported.

A DTMF encoder/decoder, a full complement of auxiliary ADCs and DACs and dual synthesised clock outputs are included.

The device also has flexible powersaving modes and is available in 48-pin VQFN and LQFP packages.

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Devices are available through our distributors below:


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  • RFMW logo

Block diagram


Technical Portal

No additional information available.


  • Concurrent Audio, Signalling and Data Operations
  • Complete Audio Band Processing:
    – Selectable Audio Processing Order
    – Pre and De-emphasis
    – Selectable 2.55/3.0 kHz Filtering
    – Limiter
  • Programmable Voice-band Scrambler
  • In-band Signalling:
    – DTMF
    – NOAA NWR
  • DTMF and Audio Tone Encoder
  • Dual Auxiliary ADC with 4 Multiplexed Inputs
  • C-BUS Serial Interface to Host µController
  • Four x Auxiliary DACs
  • Dual Programmable System Clock Outputs
  • Tx Outputs for Single or Two-point Modulation
  • Three x Analogue Inputs
  • Digital Gain Adjustment
  • DSC/ATIS Modem for Marine Applications
  • Default 3.6864MHz Xtal/Clock
  • Low Power Operation with Flexible Powersave Modes
  • Compact VQFN and LQFP Packages


  • Marine VHF Radio and/or Marine Safety Systems

Power supply requirement

  • 3.3V power supply

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Design resources

EV8850 Evaluation Kit

EV8850 evkit EV8850_small The EV8850 Evaluation Kit is designed to assist in the evaluation and application development of the CMX885 Marine VHF Audio and Signalling Processor. The kit is in the form of a populated PCB comprising a CMX885 IC and appropriate supporting components and circuitry. EV8850_User_Manual


C-BUS Guides

Guides to operation and interfacing

Variable Split-Band Scrambling

How it works

EV8850 Schematics

EV8850 Schematics

Package: Q3

48-pin VQFN

Package: L4

48-pin LQFP

VQFN Design Guidance Notes

VQFN Design Guidance Notes

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