CMX972 CML Microcircuits Quadrature Demodulator with IF PLL/VCO COMMUNICATION SEMICONDUCTORS D/972/3 April 2019 Provisional Issue Features Applications 20 300MHz IF/RF Demodulator Wireless Data Terminals 10MHz Rx I/Q Bandwidth HF/VHF and UHF Mobile Radio < 1 degree I/Q Phase Matching Avionics Radio Systems < 0.5 dB I/Q Gain Matching Software Defined Radio (SDR) Low Power, 3.0V 3.6V Operation Satellite Terminals Small 32-lead VQFN Package VCO VCO VCO VCO RXLO n/c OA1O OA1N P2 P1 N1 N2 n/c OA1P VCO 40-1000MHz n/c VSS n/c CSN n/c OA2O Local oscillator switching IFIN OA2N VCC OA2P Quadrature demodulator RXIN RDATA Serial bus PLL and control RXIP SCLK VCC n/c RXQP RXQN REFIN DO CDATA VDD SYNTH 2019 CML Microsystems Plc Quadrature Demodulator with IF PLL/VCO CMX972 1 Brief Description The CMX972 features a low-power quadrature IF/RF demodulator with wide operating frequency range and optimised power consumption. The demodulator is suitable for superheterodyne architectures with IF frequencies up to 300MHz and the device may be used in low IF systems or in those converting down to baseband. An on-chip PLL and VCO, together with uncommitted baseband differential amplifiers, provide additional flexibility. Control of the CMX972 is by serial bus. The CMX972 is supplied in an RF-optimised 32-lead VQFN package. 2019 CML Microsystems Plc 2 D/972/3