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
1.7dB noise figure at 1.5GHz
18dB programmable gain range
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
-40° to +85° operating temp. range
Small footprint VQFN package (6mm x 6mm)
Integer-N 14-bit divider
Output range 31MHz – 1GHz