Maldon, Essex – CML Microcircuits (CML), a leading innovator and provider of low-power semiconductors for global communications markets, has introduced a half-duplex audio, signalling and data processing IC for use in Marine VHF radio systems.
The new CMX885 Marine VHF baseband processor 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.
Applications:
The CMX885 is the complete marine world audio and signalling solution with inband 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 utilised as part of the overall marine VHF transceiver system.
Features include digital gain control, pre/de-emphasis, filtering, soft limiting and voice scrambling options.
Suitable for both portable and fixed (maritime) mobile transceivers, the CMX885 utilises 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.
Additional Features:
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 CMX885 operates between 3.0V and 3.6V and is available in 48-pin VQFN and LQFP packages.
The CMX885 operates between 3.0V 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.
Handheld VHF Radio
Description:
The CMX885 is a half-duplex, audio, signalling and data processing IC for use in Marine VHF radio systems.
Comprehensive audio processing facilities include complete voice-band processing, filtering, pre- or de-emphasis and frequency inversion scrambling. The audio processing feature operating order is selectable. 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 NWR decoding are supported.
A DTMF encoder/decoder, a full complement of auxiliary ADCs and DACs and dual synthesised clock outputs are included in this low power PMR processor.
The device also has flexible powersaving modes and is available in 48-pin VQFN and LQFP packages.
Marine VHF
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
more . . .
Applications:
Marine VHF Radio and/or Safety Systems
Packages:
CMX885L4 – 48-pin LQFP
CMX885Q3 – 48-pin VQFN
Supply Requirement:
3.3V power supply
Dual Auxiliary ADC with 4 Multiplexed Inputs
C-BUS Serial Interface to Host µController
4 x Auxiliary DACs
Dual Priogrammable System Clock Outputs
Tx Outputs for Single or Two-point Modulation
3 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
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