CMX975Q4

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.

Features

• 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

Applications

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