CML - Radio Frequency - CMX994

The CMX994/CMX994A/CMX994E is a family of direct conversion receiver ICs with PowerTrade™, the ability to dynamically select power vs. performance modes to optimise operating trade-offs.

CMX994 - Standard and low power modes
CMX994A - Standard and additional low power modes
CMX994E - Enhanced, standard and low power modes

The CMX994/A/E offer exceptional blocking performance, typical values are in the range 98dB to 102dB depending on the measurement method.

All three devices include a broadband LNA with gain control followed by a high dynamic range, very high IIP2, I/Q demodulator. The receiver baseband section includes amplifiers and precise, configurable bandwidth, baseband filter stages. LO generation is provided by an integer-N PLL and a VCO negative resistance amplifier; an external LO may also be used. LO dividers are provided for flexible multi-band operation. The devices operate from a single 3.3V supply over a temperature range of –40°C to +85°C and are available in a small 40-pin VQFN (Q4) package.

The CMX994A enables a significant reduction in power by allowing LO phase correction to be turned off. A further reduction is made possible by the facility to disable either the I or Q channel. The CMX994E expands on that by adding an enhanced performance mode that features improved intermodulation in the receive path mixers.

Operate from a single 3.3V supply over a temperature range of –40°C to +85°C and are available in a small 40-pin VQFN (Q4) package.


  • Direct Conversion Receiver Family with PowerTrade™ Flexible Power vs. Performance Modes
    • CMX994 - Standard and Low Power Modes 
    • CMX994A - Standard and Additional Low Power Modes
    • CMX994E - Enhanced, Standard and Low Power Modes
  • Rx Single Conversion to Zero IF, Near-zero IF or Low IF; Zero IF Eliminates Image Responses
  • Very High Mixer IIP2 for Practical Zero IF Receiver
  • 100MHz to 1000MHz I/Q Demodulator (CMX994A/E), 100MHz to 940MHz I/Q Demodulator (CMX994), Extended Operation down to 50MHz
  • LNA with Gain Control
  • Precise Filtering with 1:2:4 Bandwidth Select Control
  • Mixer Bandwidth up to 20MHz
  • Local Oscillator
    • LO synthesiser
    • VCO Negative Resistance Amplifier
    • Rx LO Divide by 2, 4 or 6 Modes
    • Tx LO Output with Divide by 1, 2, 4 or 6 Modes
  • Small Size 40-pin VQFN Package


  • Analogue/digital Multi-mode Radio
  • Software Defined Radio (SDR)
  • Data Telemetry Modems
  • Satellite Communications
  • Constant Envelope and Linear Modulation
  • Rx Function Compatible with CMX998
  • Cartesian Feedback Loop Transmitter
  • Narrowband e.g.: 25kHz, 12.5kHz and 6.25kHz
  • Wideband Data e.g. >1MHz Bandwidth

Supply Requirement:

  • 3.0 to 3.6 V