Maritime Communications
CMX885 – Marine VHF Audio and Signalling Processor
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.
Devices are available through our Distributor Network.
Features
- 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
Applications
- Marine VHF Radio and/or Marine Safety Systems
Power Supply Requirement
- 3.3V power supply
Downloads
Design Resources
| EV8850 |  |
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
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