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2.7GHz Up/Down-converter, LNA, Dual PLL + VCO



  • 1 to 2.7 GHz Up/Down-converter
    Configurable image reject or normal mode Rx mixer
    Configurable sideband suppression or normal mode Tx mixer
    Combine with CMX973 to implement RF-to-I/Q transceiver
    1 to 2.7 GHz RF / 10 to 500 MHz IF
  • Integrated LNA
    1.7dB noise figure at 1.5GHz
    18dB programmable gain range
  • RF synthesiser/PLL
    Fractional-N 24-bit divider
    Output range 350MHz – 3.6GHz
    Programmable output divider
    Fast lock function
    Programmable charge pump current
  • IF synthesiser/PLL
    Integer-N 14-bit divider
    Output range 31MHz – 1GHz
    Programmable output divider-
  • 209dBc/Hz normalised phase noiseGeneral purpose RF / IF
  • Integrated low noise LDO regulator
  • Single 2.7V to 3.6V supply
  • 1.8V digital interface supported
  • C-BUS configurable
  • -40° to +85° operating temp. range
  • Small outline 6mm x 6mm VQFN package


  • L-Band / S-Band satcom
  • Military radio
  • Wireless microphone
  • 2.4GHz ISM transceiver
  • Wireless modem
  • General purpose RF / IF

The CMX975 is an RF building block IC that provides multiple functions consisting of: RF PLL/VCO, IF PLL/VCO, Transmit Up-convert mixer, Rx Down-convert mixer, and LNA.

The RF high frequency synthesiser employs a Fractional-N design and will operate at up to 3.6GHz using a fully-integrated internal VCO or at up to 6GHz with an external frequency source. The IF synthesiser employs an integer-N design and will operate at up to 1GHz. It has an integrated VCO requiring only an external inductor to set the frequency. Internal dividers and buffers are provided for each synthesiser/PLL allowing a wide range of frequency generation options.

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Design Support Information

EV9750-Evaluation Kit The EV9750 is a demonstration and evaluation platform for the CMX975.
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