Analog Devices’ Quadrature Demodulators Offer Unprecedented Levels of Dynamic Range and Integration

Both demodulators integrate an IQ demodulator with a high performance phase-locked loop (PLL), a low noise voltage-controlled oscillator (VCO), and two low drop-out regulators (LDO). The ADRF6806 and ADRF6807 are the industry’s only quadrature demodulators to combine three RF functions into a single device, thereby simplifying design and reducing board space and bill of materials cost. The ADRF6806 and ADRF6807 use a high performance mixer core that results in an exceptional input IP3 and input P1dB, with a very low output noise floor for excellent dynamic range. The SPI port allows the user to control the fractional-N PLL functions, the demodulator LO divider functions, multiple optimisation functions, low power mode, and also allow for an externally applied LO.



The ADRF6806 and ADRF6807 demodulators are designed on an advanced silicon-germanium BiCMOS process and are available in a compact 6-mm × 6-mm LFCSP package.



ADRF6806 Quadrature Demodulator Key Features:

• LO frequency range of 50 MHz to 525 MHz

• Leading RF performance: Input P1dB of 12.2 dBm; Input IP3 of 28.5 dBm; Noise figure (DSB) of 12.2; Voltage conversion gain of 1 dB

• Quadrature demodulation accuracy: phase accuracy of <0.5° and amplitude accuracy of <0.1 dB

• Baseband demodulation of 135 MHz, 3-dB bandwidth

• SPI serial interface for PLL programming



ADRF6807 Quadrature Demodulator Key Features:

• LO frequency range of 700 MHz to 1050 MHz

• Leading RF performance: Input P1dB of 12.8 dBm; Input IP3 of 26.7 dBm; Noise figure (DSB) of 13.1; Voltage conversion gain of 1 dB

• Quadrature demodulation accuracy: phase accuracy of <0.5° and amplitude accuracy of <0.1 dB

• Baseband demodulation of 170 MHz, 3-dB bandwidth

• SPI serial interface for PLL programming



The ADRF6806 and ADRF6807 can be designed into circuits with ADI’s ADL5561 and ADL5562 IF VGAs, ADL5535 and ADL5536 IF amplifiers and more.



ADI’s RF IC Portfolio Covers Entire RF Signal Chain

Using a unique combination of design skills, system understanding and process technologies, Analog Devices offers the broadest portfolio of RF ICs covering the entire RF signal chain from industry-leading high-performance RF function blocks to highly integrated WiMAX and short-range, single-chip transceiver solutions. The RF function blocks include PLL, integrated PLL/VCO and DDS synthesisers; TruPwr™ RMS power detectors and logarithmic amplifiers; variable gain amplifiers; power amplifiers, low noise amplifiers and other amplifiers; RF mixers and direct conversion modulator and demodulator products. These products are supported by a wide range of design resources to ease the development of RF systems, including free design tools, Circuits from the Lab™ reference circuits and the EngineerZone™ technical forums.