FRS Signalling Processor
CMX882
1.1
Brief Description
CMX882, a full-function half-duplex audio and signalling processor IC for FRS and PMR446 type facilities
suitable for both complex and simple end-designs. Under the control of the host µC, all voiceband
requirements are catered for: voiceband and sub-audio filtering, pre/de-emphasis, compression and
expansion and audio routing and global level setting with single or two-point modulation in the transmit
path.
The combination of new and standard signalling functions of this product offer, under software control,
increased functionality, versatility and privacy. Standard Extended-Code CTCSS and DCS functions are
integrated with the new XTCSS code implementation. XTCSS provides additional and improved squelch-
centred privacy codes with the added advantage of ‘silent operation’; no annoying interference from other
sub-audio users. XTCSS fitted radios enjoy more privacy and flexibility of operation.
For advanced and enhanced radio operation, the CMX882 provides a 1200/2400 bps free-format and
packet data FFSK/MSK modem for text messaging/paging, passing GPS location data (compatible with
NMEA 0183) and other data applications.
With ultra low power requirements and graduated powersave, this product only requires a smaller, lower-
power µC than existing FRS/PMR446 solutions. It is available in compact SSOP and TSSOP packages.
2004 CML Microsystems Plc
2
D/882/7
CMLMICRO [ CML MICROCIRCUITS ]
