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CMX882

FRS Signalling Processor

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

CMX882

Baseband Processor for

‘Leisure’ Radios with Data

D/882/7 March 2004

Provisional Issue

Full-Feature Audio-Processing, Signalling and GPS Data for

Half Duplex FRS, MURS, PMR44 and GMRS ‘Leisure’ Radios

Features

• Automatic signal type scanning and IRQ on

detection of valid Rx signals, level or RSSI

• Voice processing facilities, including Tx and Rx

gain setting and voice/subaudio filtering

• Tone generator for caller recognition tunes

• Programmable power down control

• Programmable signal detection thresholds

• Low Power operation with Zero Power mode

• Uncommitted Aux ADC with switchable input

to monitor signals

• C-BUS serial host interface

• RF interface allowing 1 or 2 point modulation

• Programmable soft limiter

• Enhanced CTCSS and 23/24 bit DCS codecs

• Zero ‘talk down’ CTCSS decoder performance

prevents dropouts

• Silent operation by removal of unwanted calls • ‘All call code’ and ‘monitor’ modes for CTCSS

• Selectable voice companding

• Audio scrambling

• XTCSS channel and data signalling

• Robust Half Duplex FFSK/MSK modem,

1200/2400 bps, gets data through when signal

is too degraded for voice – for text

messaging/paging, location transfer, etc.

applications.

• Robust automatic packet data protocol with:

Error correction and detection, Interleaving

and data scrambling/privacy coding.

 2004 CML Microsystems Plc

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