CMX881(2002) Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX881
(Rev.:2002)

Baseband Processor for PMR and Trunked Radios

CML Microsystems Plc 

CML Microcircuits

COMMUNICATION SEMICONDUCTORS

CMX881

Baseband Processor for

PMR and Trunked Radios

D/881/2 May 2002

Advance Information

Full-Feature Audio-Processing, Signalling and Data for

Half Duplex Dual-Mode Analogue PMR and Trunked Radios

Features

• Automatic signal scanning and IRQ on

detection of valid Rx signals, level or RSSI

• Tone generator for caller recognition tunes

• Programmable powerdown control

• Programmable signal detection thresholds

• Low Power operation with ‘Zero Power’ mode

• Uncommitted Aux ADC with switchable input

to monitor signals

• Meets ETS 300 086, MPT1327, PAA1382 and

ETS 300 230 specifications

• 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

• DTMF transmitter

• Programmable Selcall codec

• Half duplex FFSK/MSK modem, 1200/2400 b/s

with CRC and parity generator/checker

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 offers an embedded 1200/2400 b/s MSK/FFSK

freeformat modem with checksum generation and reception and sync detection in the Rx path.

With ultra low power requirements and graduated powersave, this product only requires a smaller, lower-

power µC than existing PMR or trunked radio solutions, is available in compact SSOP and TSSOP

packages.

© 2002 CML Microsystems Plc

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