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Consumer Microcircuits Limited - Marine VHF Audio and Signalling Processor

Numéro de référence CMX885
Description Marine VHF Audio and Signalling Processor
Fabricant Consumer Microcircuits Limited 
Logo Consumer Microcircuits Limited 





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CMX885 fiche technique
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX885
Marine VHF Audio and
Signalling Processor
D/885/3 December 2010
Audio and Signalling Processing, DTMF, DSC/ATIS and NOAA
with Auxiliary Functions for use in Marine VHF Systems
Features
Concurrent Audio/Signalling/Data Operations
Complete Audio-band Processing:
o Selectable Audio Processing Order
o Pre and De-emphasis
o Selectable 2.55/3.0 kHz Filtering
o Limiter
DSC/ATIS Modem for Marine Applications
Programmable Voice Scrambler
Inband Signalling: DTMF, NOAA NWR
C-BUS Serial Interface to Host µController
DTMF and Audio Tone Encoder/Decoder
Small VQFN and LQFP Packages
Dual Auxiliary ADC, 4 Multiplexed Inputs
4 x Auxiliary DACs
Dual Programmable System Clock Outputs
Tx Outputs for Single, Two-Point Modulation
3 x Analogue Inputs (Mic or Discriminator)
Digital Gain Adjustment
Default 3.6864MHz Xtal/Clock
Flexible Powersave Modes
Low-power 3.0V to 3.6V Operation
Audio Out
Mic Input
Auxiliary
Multiplexed
ADC Inputs
Host µC
IRQ
C-BUS
Reference Clock
3V to 3.6V Supply
System Clock 1
System Clock 2
CMX885
Marine VHF
Baseband Processor
Auxiliary
DACs
Modulator
Discriminator
Optional 2nd Receiver
Discriminator
Tx Enable
Rx Enable
RF
(Rx/Tx)
RF
(Rx)
1 Brief 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 audio 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.
1200bps Digital Selcall (DSC) or 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.
© 2010 CML Microsystems Plc

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