Datasheet > DE9944

DE9944

更新时间： 2024-09-17 01:24:51

品牌	Logo	应用领域
CMLMICRO		/
页数	文件大小	规格书
3页	446K
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SDR Demonstrator

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PP/9944/1 December 2013

DE9944

SDR Demonstrator

Soꢀware Deﬁned Radio Demonstrator for FDMA Digital/Analogue PMR

DE9944 Brief Descripꢀon

The DE9944 is a compact demonstraꢁon plaꢂorm for Narrowband FDMA

Digital/Analogue PMR Radio, providing a complete RF to baseband soluꢁon.

Introducꢀon

FDMA (6.25 kHz) digital PMR is

an enabler to achieve highly

funcꢁonal soluꢁons by using low

cost and low complexity

technology.

The board is based on the CMX7141 FDMA PMR Processor and incorporates the CMX618

RALCWI Vocoder, the CMX7262 TWELP Professional Radio Vocoder, and the CMX994 Direct

Conversion Receiver. The board can be used to demonstrate a complete RF transceiver and

baseband funcꢁon supporꢁng a direct conversion receiver and VCO 2-point modulaꢁon

transmiꢃer.

There are a number of FDMA

digital PMR technologies

available including: dPMR,

NXDN, ARIB STD-T98,

The DE9944 features a built in keyboard, display, microphone and speaker and so can be

used to demonstrate peer-to-peer operaꢁon in a stand-alone conﬁguraꢁon. The board has an

ARM processor which handles iniꢁal board power up and loading of the Funcꢁon Images for

the CMX7141 and CMX7262. Once the system is powered up, the processor implements basic

radio funcꢁonality (channel selecꢁon etc) and baseband control, allowing demonstraꢁon of a

simple voice call and data transfer.

ARIB STD T-102, all providing the

best possible channel eﬃciency.

dPMR is an ETSI standard that

oﬀers voice and/or data for peer

-to-peer through to complex

trunking applicaꢁons. The dPMR

ETSI standards TS 102 490 and

TS 102 658 comply with the

Harmonised EN 301 166-2

Standard.

The DE9944 provides a Fracꢁonal-N PLL and VCO plus associated circuits to provide local

oscillator signals for the CMX994. The design also includes a 1W power ampliﬁer, harmonic

ﬁlter and Tx/Rx switch. The RF performance is designed to be compliant with EN 301 166 for

dPMR applicaꢁons and TIA-603-D / EN 300 086 for analogue applicaꢁons. All the circuits are

provided with power-down capability to allow powersave / standby operaꢁon.

The DE9944 FDMA digital radio

SDR demonstrator provides the

fastest route from evaluaꢁon

through to producꢁon of a small,

highly integrated FDMA digital

PMR Radio.

Feature Summary



Direct Conversion Digital Radio Demonstrator

Digital PMR (e.g. dPMR) and Analogue FM

Provides demonstraꢁon plaꢂorm for:

 On-board

 ARM Host Processor (Cortex M3)

 Frac-N PLL and VCO for 444 MHz

to 450 MHz Operaꢁon

 1W Power Ampliﬁer

 Microphone

 Loudspeaker

 Jack sockets for audio in/out

 16-buꢃon (4 x 4) Keypad

 2 x 16-character LCD Display

 Powered by external 4.5V power

supply or 3 x AA baꢃeries

Design Support

Available via the CML website:



Direct Conversion Receiver CMX994

FDMA Radio Processor CMX7141

TWELP Professional Radio Vocoder CMX7262

RALCWI Vocoder with Integrated Voice Codec

CMX618



 DE9944 SDR Demonstrator

 User manual

 Board schemaꢁcs

 Board Gerber ﬁles

 BOM list



Can funcꢁon in the following modes



Completely stand-alone

 Scripts



Controlled by scripts running via PC

User-deﬁned host controller interface

 Host ‘C’ code

 Individual Product Data

 CMX7141 Analogue/

digital PMR Processor

 CMX994 Direct

Conversion Receiver

 CMX7262 Professional

Radio Vocoder

 CMX618 RALCWI Vocoder

12 3

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