Charge pump IC converter CMX975

charge pump IC converter
charge pump IC converter
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frequency, charge pump
Other characteristics
programmable, 24-bit, high-performance


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. 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


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