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ADRF6806:  50 MHz TO 525 MHz Quadrature Demodulator with Fractional-N PLL and VCO

Product Details

Product Status:Recommended for New Designs

The ADRF6806 is a high dynamic range IQ demodulator with integrated PLL and VCO. The fractional-N PLL/synthesizer generates a frequency in the range of 2.8 GHz to 4.2 GHz. A programmable quadrature divider (divide ratio = 4 to 80) divides the output frequency of the VCO down to the required local oscillator (LO) frequency to drive the mixers in quadrature. Additionally, an output divider (divide ratio = 4 to 8) generates a divided-down VCO signal for external use.

The PLL reference input is supported from 10 MHz to 160 MHz. The phase detector output controls a charge pump whose output is integrated in an off-chip loop filter. The loop filter output is then applied to an integrated VCO.

The IQ demodulator mixes the differential RF input with the complex LO derived from the quadrature divider. The differential I and Q output paths have excellent quadrature accuracy and can handle baseband signaling or complex IF up to 120 MHz.

A reduced power mode of operation is also provided by programming the serial interface registers to reduce current consumption, with slightly degraded input linearity and output current drive.

The ADRF6806 is fabricated using an advanced silicon-germanium BiCMOS process. It is available in a 40-lead, exposed-paddle, RoHS-compliant, 6 mm × 6 mm LFCSP package. Performance is specified over the −40°C to +85°C temperature range.


  • QAM/QPSK RF/IF demodulators
  • Cellular W-CDMA/CDMA/CDMA2000
  • Microwave point-to-(multi)point radios
  • Broadband wireless and WiMAX


  • IQ demodulator with integrated fractional-N PLL
  • LO frequency range: 50 MHz to 525 MHz
  • Quadrature demodulation accuracy
    Phase accuracy: <0.5°
    Amplitude accuracy: <0.1 dB
  • Baseband demodulation: 135 MHz, 3 dB bandwidth
  • For the following specifications (LPEN = 0)/(LPEN = 1):
    Input P1dB: 12.2 dBm/10.6 dBm
    Input IP3: 28.5 dBm/25.2 dBm
    Noise figure (DSB): 12.2/11.4
    Voltage conversion gain: 1 dB/4.2 dB
  • SPI serial interface for PLL programming
  • 40-lead, 6 mm × 6 mm LFCSP

Functional Block Diagram for ADRF6806


Title Content Type File Type
ADRF6806: 50 MHz to 525 MHz Quadrature Demodulator with Fractional-N PLL and VCO Data Sheet (Rev B, 03/2012) (pdf, 1504 kB) Data Sheets PDF
RF Source Booklet  (PDF, 4353 kB)
RF IC Product Overview - Version P (02/2014)
Overview PDF
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADI’s ADIsimRF design tool provides calculations for the most important parameters within the RF signal chain, including cascaded gain, noise figure, IP3, P1dB, and total power consumption.
ADIsim Design/Simulation Tools HTML
ADIsimPLL™- Version 3.60.10
ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.
ADIsim Design/Simulation Tools HTML
Windows 7 Drivers for the SPI Software  (zip, 724 kB) Evaluation Software ZIP
ADRF6806 Evaluation Board Software (Adapter board with USB controlled Cypress Microcontroller)  (zip, 460 kB) Evaluation Software ZIP
ADRF6806 Evaluation Board Software and Documentation  (zip, 453 kB) Evaluation Software ZIP

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended Baseband Driver Amplifiers for the ADRF6806

  • For low noise drivers in low voltage (1.8V) ADC applications, we recommend the ADA4930-1 or the dual ADA4930-2.
  • For selectable gains of 1, 2 or 3, we recommend the low cost, low power ADA4950-1 or the dual ADA4950-2.
  • For a digital programmable VGA, we recommend the AD8366.
  • For a differential RF/IF amplifier, we recommend the ADL5562 or the ADL5565.
  • For variable gain and programmable baseband filters, we recommend the ADRF6510 or the ADRF6516.
Recommended Dual Analog-to-Digital Converters for the ADRF6806
  • For 16-bit performance, low power and high sampling rate, we recommend the AD9268 or AD9650.
  • For 14-bit performance, low power and high sampling rate, we recommend the AD9258 or AD9251.
  • For 12-bit performance, low power, low cost and ease of use, we recommend the AD9231.
  • For 16-bit performance, multistage differential pipeline architecture with integrated quadrature error correction (QEC), we recommend the AD9269.
  • For 16-bit performance, continuous time sigma delta architecture with integrated QEC, we recommend the AD9262.
Recommended Power Solutions

  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADRF6806 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
ADRF6806-EVALZ Status: Production Evaluation Board - Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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