Double switch ADMV4540 series

programmableRF4-wire

Fractional-N synthesizer with low phase noise VCO K band quadrature demodulator Programmable via 4-wire SPI RF operating frequency range: 17 GHz to 22 GHz LO internal frequency range: 17 GHz to 21.5 GHz Double sideband noise figure: 5 dB at maximum conversion gain Output integrated phase noise, 1 kHz to 10 MHz: 50 dB Conversion gain control range of >50 dB IM3 of −54 dBc at −30 dBm composite input level, ΔfRF = 1 MHz 3 baseband, SPI-selectable LPFs with corner frequencies of: 125 MHz, 250 MHz, and 500 MHz on each baseband path The ADMV4540 is a highly integrated quadrature demodulator with integrated synthesizer ideally suited for next generation K band satellite communication. The RF front end of the ADMV4540 consists of two low noise amplifier (LNA) paths, each with an optimal cascaded, 5 dB, double sideband noise figure at maximum gain, while minimizing external components. The dual paths allow support for antenna polarization. Selection of the LNA path can be done through the SPI. The LNA output is then downconverted to baseband using an inphase and quadrature (I/Q) mixer. The I/Q mixer output is then fed into fully differential low noise and low distortion programmable filters and variable gain amplifiers (VGAs). Each channel is capable of rejecting large, out of band interferers while reliably boosting the wanted signal, thus reducing the bandwidth and resolution requirements on the analog-to-digital converters (ADCs) of the system.