Product description

The CMX973 is a high performance RF quadrature modulator/demodulator featuring a wide operating frequency range and attractive power consumption.

The CMX973 forms the basis of a high-performance RF transceiver system combining a flexible IF/RF quadrature modulator and quadrature demodulator.

Wide signal bandwidth at RF, 0dBm output, low noise and serial bus control delivers maximum flexibility and high-performance, at a low operating power. It is suitable for superheterodyne architectures with IF frequencies of 20MHz to 300MHz and may be used in low IF systems or those converting down to baseband.

The modulator converts directly from baseband to the desired transmit frequency 20MHz to 1GHz and features quadrature phase correction to minimise unwanted spectral components.

The differential inputs are ideal for direct connection to standard modems and interface ICs such as CML’s CMX7163 QAM Data Modem, CMX910 AIS Baseband Signal Processor, CMX981 Digital Radio Baseband Processor  and more!

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Devices are available through our distributors below:


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Block diagram


Technical Portal

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  • 20 – 300MHz IF/RF Demodulator
  • 10MHz Rx and 25MHz Tx I/Q Bandwidth
  • 20 – 1000MHz RF Modulator 0dBm Modulator Output
  • < 1 degree I/Q Demod Phase Matching
  • < 0.5dB I/Q Demod Gain Matching
  • IF PLL and VCO amp
  • Low Power Mod/Demod 61mA/15mA @ 3.3V
  • Small 32-pin VQFN Package


  • Wireless Data Terminals
  • HF/VHF and UHF Mobile Radio
  • Avionics Radio Systems
  • Telemetry Modems
  • Wireless Microphones
  • Software Defined Radio (SDR)
  • Satellite Terminals

Power supply requirement

  • 3.0 to 3.6 V power supply

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Design resources

Frequency Estimation for a VCO using a Negative Resistance Amplifier

Application Note describing how to estimate the operating frequency of VCO designs using a negative resistance amplifier. An Excel spreadsheet that automates the calculation is available below.

Excel Spreadsheet - Frequency Estimation for a VCO using a Negative Resistance Amplifier

An Excel spreadsheet that calculates the operating frequency of VCO designs using a negative resistance amplifier. An Application Note describing the process is available above.

EV9730 Evaluation Kit

EV9730 EV9730 The EV9730 is an Evaluation Kit designed for evaluating and demonstrating the capabilities of the CMX973 RF Quadrature Modulator/Demodulator IC. EV9730_Product_Preview


C-BUS Guides

Guides to operation and interfacing

EV9730 Board Schematics

EV9730 high resolution schematics. Version A02

EV9730 Evaluation Software

EV9730 Evaluation Software. Requires a PE0003 Universal Interface Card. Version 3.1

EV9730 Quick Start

A simple guide to help users get started evaluating the EV9730. Version 1

EV9730 PCB Information

Additional information for EV9730 serial numbers 201608-201631 and 202397-202420

PE0003 Driver

PE0003 USB driver for Windows. Version 1.0

Package: Q5

32-pin VQFN

VQFN Design Guidance Notes

VQFN Design Guidance Notes

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