The ADRF6850 from Analog Devices, introduced today, is a highly integrated broadband quadrature demodulator, frequency synthesizer, and variable gain amplifier (VGA). The device covers an operating frequency range from 100 MHz to 1000 MHz for use in both narrowband and wideband communications applications, performing quadrature demodulation from IF directly to baseband frequencies.
The part combines five devices and three RF functions into one small-footprint, surface-mount chip, integrating a 60dB VGA , a fractional-N PLL (phase locked loop) synthesizer with VCO (voltage controlled oscillator) and two baseband ADC drivers into an 8mm x 8mm LFCSP package.
Control of all the on-chip registers is through a user-selected SPI interface or I2C interface. The device operates from a single power supply ranging from 3.15 V to 3.45 V.
Applications include cellular base stations, satellite communications, point-to-point (PtP) radios and defense systems.