CMX881(2002) 查看數據表（PDF） - CML Microsystems Plc

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CMX881
(Rev.:2002)

Baseband Processor for PMR and Trunked Radios

CML Microsystems Plc 

PMR Signalling Processor

CMX881 Functions and Facilities

CMX881

Half Duplex Operation

Working in a half duplex mode, when the product is in Tx the Rx sections can be powered down to

extend battery life, conversely in Rx major sections of the Tx can be treated in the same manner.

Serial Control and Data Interface

C-BUS: Serial control, data and command program interface compatible with SCI, SPI and Microwire

type interfaces.

Power Requirements and Economy

With an ultra low power requirement, the CMX881 operates from a single 2.7 to 5.5 Volt supply with

graduated ‘Sleep Mode’ powersaving facilities for both Rx and Tx modes.

Signalling:

CTCSS

The CMX881 is pre-programmed with 39 standard CTCSS (+ Notone and DCS ‘turn-off’ code)

frequencies, any one of which can be selected for reception or transmission. Decoding is aided by the

use of adjustable decode bandwidths and threshold levels. Decoding is carried out rapidly thus avoiding

the loss of the beginning of speech or data signals.

© 2002 CML Microsystems Plc

2

D/881/2

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