Quadrature demodulator IC with PLL/VCO
The device features a low-power IF/RF quadrature demodulator with PLL/VCO, a wide operating frequency range and optimised power consumption. The demodulator is suitable for superheterodyne architectures with IF frequencies up to 300 MHz 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 small, RF-optimised 32-pin VQFN package and minimal external components make the device ideal for space-constrained applications.
Features include; 20 to 300 MHz IF/RF Demodulator; 10 MHz Rx I/Q Bandwidth; under 1 degree I/Q Phase Matching; and under 0.5 dB I/Q Gain Matching. The chip offers a flexible RF building-block solution with excellent intermodulation performance, and phase/amplitude balance. Serial bus configuration is combined with simple interfacing to existing modem/baseband products.
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