Product description

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

The CMX975 is an enabler for small form factor high frequency RF transceiver designs, operating up to 2.7GHz, that require high performance and low power consumption; in a small form factor. The device integrates up and down conversion mixers and associated frequency generation circuitry, therefore minimising the number of external components required to configure a complete system.

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 CMX975 has been designed to work with CML’s CMX973 Quadrature Modulator/Demodulator to provide a simple and cost effective high frequency superhet transceiver operating in the range 1 to 2.7 GHz.

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  • 1 – 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
  • Integrated LNA:
    • 1.7dB noise figure at 1.5GHz
    • 18dB programmable gain range
  • RF synthesiser/PLL:
    • Fractional-N 24-bit divider
    • Output range 338MHz – 3.6GHz
    • Programmable output divider
    • Fast lock function
    • Programmable charge pump current
    • -212dBc/Hz normalised phase noise
  • 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 footprint VQFN package (6mm x 6mm)
  • IF synthesiser/PLL:
    • Integer-N 14-bit divider
    • Output range 31MHz – 1GHz
    • Programmable output divider


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

Power supply requirement

  • 2.7 to 3.6V

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Design resources

EV9750 EV9750_image The EV9750 is a demonstration and evaluation platform for the CMX975. The CMX975 provides functionality consisting of RF PLL/VCO + IF PLL/VCO + Transmit Up-convert Mixer + Receive Down-convert Mixer + LNA. EV9750_User_Manual

Package: Q4

40-pin VQFN

EV9750 Evaluation

A Windows GUI-based application for the EV9750 Evaluation Kit. A PE0003 Universal Interface Card is required to use this application. Ver 1.0

EV9750 Board Schematic

EV9750 Board high-resolution schematics. Ver. C02

EV9750 Design Files

EV9750 Board design files including Gerbers, Drill, material composition and layer stack information. Ver C

EV9750 BOM

EV9750 Bill of materials. Ver C02

C-BUS Guides

Guides to operation and interfacing

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