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

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CMX881

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

Zero ‘Talkdown’ performance eliminates unwanted breaks in communication. The CMX881 is pre-

programmed with 39 standard CTCSS (+ Notone and DCS ‘turn off’ tone) 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.

 2004 CML Microsystems Plc

3

D/881/7

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