CMX881 Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX881

Baseband Processor for PMR and Trunked Radios

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

CMX881

Baseband Processor for

PMR and Trunked Radios

D/881/7 March 2004

Provisional Issue

Full-Feature Audio-Processing, Signalling and Data for

Half Duplex Dual-Mode Analogue PMR and Trunked 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

• C-BUS serial host interface

• Programmable powerdown control

• RF interface allowing 1 or 2 point modulation

• Programmable signal detection thresholds

• Programmable soft limiter

• Low Power operation with ‘Zero Power’ mode • Enhanced CTCSS and 23/24 bit DCS codecs

• Uncommitted Aux ADC with switchable input

to monitor signals

• Zero ‘Talkdown’ CTCSS decoder performance

prevents dropouts

• DTMF transmitter

• Meets ETS 300 086, MPT1327, PAA1382 and • Programmable Selcall codec

ETS 300 230 specifications

• Robust half-duplex FFSK/MSK modem, 1200/2400bps with CRC and parity generator/checker, gets

data through when signal is too degraded for voice – for text messaging/paging, location transfer,

etc. applications.

1.1 Brief Description

CMX881, a full-function half-duplex audio and signalling processor IC for both PMR and Trunked radio

systems suitable for 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 and audio routing and

global level setting with single or two-point modulation in the transmit path.

The combination of CTCSS and DCS functions and Selcall operation of this product offer, under software

control, increased functionality, versatility and privacy.

To cater for call setup and system signalling the CMX881 provides an embedded 1200/2400 bps

MSK/FFSK free-format modem for text messaging/paging, passing GPS location data with checksum

generation and reception and sync detection in the Rx path.

 2004 CML Microsystems Plc

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