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CML Micro CMX994 RF Direct Conversion Receiver IC

CML Micro CMX994 RF Direct Conversion Receiver IC features PowerTrade™, the ability to dynamically select power vs. performance modes to optimize operating trade-offs. The CMX994 offers exceptional blocking performance. Typical values are in the range of 98dB to 102dB depending on the measurement method. The device includes a broadband LNA with gain control and 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 CMX994 operates from a single 3.3V supply over a -40°C to +85°C temperature range and is available in a small 40-pin VQFN (Q4) package.

Features

  • Direct conversion to Zero IF, Near-zero IF, or low IF (Zero IF eliminates image responses)
  • PowerTrade options
    • CMX994: Standard and low power modes
    • CMX994A: Standard and additional low power modes
    • CMX994E: Enhanced, standard and low power modes
    • CMX994G: Enhanced, standard and low power modes, 30MHz guaranteed performance
  • 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/G), 100MHz to 940MHz I/Q demodulator (CMX994),and extended operation down to 50MHz or 30MHz (CMX994G)
  • LNA with gain control
  • Precise filtering with 1:2:4 bandwidth select control
  • Mixer bandwidth up to 20MHz
  • Tx LO output with divide by 1, 2, 4, or 6 modes
  • 3.0V to 3.6V low-power operation
  • Small size 40-pin VQFN package

Applications

  • Analog and 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, 6.25kHz
  • Wideband data e.g. >1MHz bandwidth

Videos

Block Diagram

Block Diagram - CML Micro CMX994 RF Direct Conversion Receiver IC

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Published: 2019-11-19 | Updated: 2023-08-02