Description Features Applications Downloads Design Resources

Digital/Analogue Two-Way Radio Products

CMX983 – Analogue Front End (AFE) for Digital Radio

The CMX983 is an Analogue Front End (AFE) IC that bridges the gap between a digital radio’s RF section and the DSP/FPGA.

Specifically designed to meet the needs of a Software Defined Radio (SDR). It is suitable for radio systems employing modulation bandwidths up to 50kHz in wideband mode and up to 25kHz in narrowband mode.

The CMX983 connects seamlessly with CML’s CMX994 Direct Conversion Receiver and the CMX998 Cartesian Feedback Loop Transmitter, to provide a complete small form factor, RF-to-digitised baseband solution.

The device is widely used in high performance wireless data systems including: military and satellite communication, professional two-way radio and wireless telemetry applications.

Devices are available through our Distributor Network.

CMX983-block-diagram

Features

Rx channel
– Two 16-bit Σ-Δ A/D Converters
– Programmable Channel Filter
Tx Channel
– Two 14-bit Σ-Δ D/A Converters
– Programmable Channel Filter
RF Support
– Two 2.1GHz Fractional-N Synthesisers
Auxiliary Functions
– 10-bit A/D Converter supporting (8-inputs)
– Five Analogue Comparators
– Nine 10-bit D/A Converters
DSP Interface
– BUS Control and Configuration Port
– Fast Serial Interface for Rx/Tx Data
Duplex and Half duplex operation
Direct connection to:
– CMX998 Cartesian Loop Transmitter
– CMX994 Direct Conversion Receiver
Low power operation
– 3.3V and 1.8v supplies
Small 64-lead VQFN Package

Applications

Software Defined Radio (SDR)
Satellite Communication
Wireless Data Terminals
Digital PMR/LMR Radio
– TETRA
– DMR
– APCO P25
– PDT

Power Supply Requirement

3.0 to 3.6 V

Downloads

CMX983ProductPreview CMX983_ds

Design Resources

FAQ Application Notes Scripts Evaluation Kits Knowledge Base

CMX983 and EV9830 Questions

Q. The EV9830 works intermittently with a PE0003 kit. Is there a problem?

A. The EV9830 and PE0003 has a hardware reset that should be toggled by the host. This pin is not accessible to the PE0003 so we recommend that C11 is replaced to extend the time that the hardware reset is held low during power up. Guidance for the location and replacement of C11 is given in the latest EV9830 User Manual. This replacement is only required on early EV9830 kits.

DMR Rx Filter

A set of CMX983 receive channel filter coefficients suitable for baseband filtering in DMR applications

Download

Rx sinc filter

CMX983 receive channel compensation coefficients using sinc filtering

Download

Configure CMX983 synthesisers

An example script to set up MCLK and configures Synth1 to 902.425MHz and Synth2 to 2.1GHz.

Download

EV9830

The EV9830 Evaluation Kit allows evaluation of the CMX983 Baseband Interface for Digital Radio. For evaluation of the Fractional-N synthesisers, a 900MHz VCO is fitted with connections to synthesiser 1 and a 2.1GHz VCO is fitted with connections to synthesiser 2. Test pads are also provided for connection to an external VCO.

EV9830_Product_Preview

EV9830 User Manual