CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX882
Baseband Processor for
‘Leisure’ Radios with Data
Provisional Issue
D/882/7 March 2004
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
•
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
•
Silent operation by removal of unwanted calls
•
Selectable voice companding
•
Voice processing facilities, including Tx and Rx
gain setting and voice/subaudio filtering
•
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
•
‘All call code’ and ‘monitor’ modes for CTCSS
•
Audio scrambling
•
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.
•
XTCSS channel and data signalling
•
Robust automatic packet data protocol with:
Error correction and detection, Interleaving
and data scrambling/privacy coding.
2004 CML Microsystems Plc
CMLMICRO [ CML MICROCIRCUITS ]
