Features and Benefits

  • Dual, Matched VGAs
  • Maximum gain: 18 dB
  • Continuous gain control range: 20 dB
  • Bandwidth: ±1 dB gain flatness: >2.9GHz
  • IMD2/3 (1.5 V p-p composite output):
    • @ 1 GHz: <−55 dBc
    • @ 2.9 GHz: <−35 dBc
  • HD2/3 (1.5 V p-p CW output):
    • 330 MHz Fundamental Tone: <−55 dBc
    • 950 MHz Fundamental Tone: <−35 dBc
  • Noise figure:
    • 10 dB at maximum gain @ 500 MHz
    • 14 dB at max gain @ 2GHz
    • NF decreases dB-for-dB with gain backoff
  • 100 Ω differential input impedance
  • 16 Ω differential output impedance
  • Programmable
    • DC output offset control: > ± 400 mV
    • Output common-mode control: > ± 200 mV
  • Dual supply operation with power-down feature
    • ±2.5V (nominal)

Product Details

The ADRF6521 is a dual, fully differential low noise and low distortion variable gain amplifier (VGA). The high spurious-free dynamic range over the gain range makes the ADRF6521 ideal for communication systems with dense constellations, multiple carriers, and nearby interferers.

The VGA has 20 dB of continuous analog gain control with a maximum gain of +18 dB. The differential input impedance is 100 Ω, while the differential output impedance is 16 Ω. The −1 dB bandwidth is 2.9 GHz. The output buffers are capable of driving 1.5 V p-p into 100 Ω loads at better than 55 dBc nominal for the third-order intermodulation distortion (IMD3) though 1GHz. Variable output dc offset control is accomplished with the OFS1 & OFS2 pins, while the output common-mode can be controlled with the VOCM pin.

The ADRF6521 flexibly operates on a single 5V supply or from a dual supply of ± 2.5 and consumes a maximum supply current of 180 mA. When fully disabled, it consumes ≤10 mA. The ADRF6521 is fabricated in an advanced silicon-germanium BiCMOS process and is available in a 20-lead, exposed pad 3 mm x 3 mm LFCSP. Performance is specified over the −40°C to +85°C temperature range.


  • Point-to-point and point-to-multipoint radios
  • Baseband IQ receivers
  • Diversity receivers
  • ADC drivers
  • Instrumentation
  • Medical

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Product Lifecycle icon-recommended Pre-Release

This product is new and engineering validation may still be underway. Quantities may be limited and design specifications may change while we ready the product for release to production.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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.

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