Marine VHF Audio and Signalling Processor IC
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- 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 . . .
- Marine VHF Radio and/or Safety Systems
- CMX885L4 - 48-pin LQFP
CMX885Q3 - 48-pin VQFN
- 3.3V power supply
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.
- 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
