CMX883 データシートの表示（PDF） - CML Microsystems Plc

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CMX883

Baseband Processor for ‘Leisure Radios’

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

CMX883

Baseband Processor for

‘Leisure Radios’

D/883/7 March 2004

Provisional Issue

Full-Feature Audio-Processing and Signalling for

Half Duplex FRS, MURS, GMRS and PMR446 ‘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

• XTCSS channel and data signalling

• 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 ‘Talkdown’ CTCSS decoder performance

prevents dropouts

• All call code and monitor modes for CTCSS

• Audio scrambler

• Selectable voice companding

1.1 Brief Description

CMX883, a full-function half-duplex audio and signalling processor IC for FRS and PMR446 type facilities

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 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.

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

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