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AD8366:  DC to 600 MHz, Dual-Digital Variable Gain Amplifiers

Product Details

Product Status:Recommended for New Designs

The AD8366 is a matched pair of fully differential, low noise and low distortion, digitally programmable variable gain amplifiers (VGAs). The gain of each amplifier can be programmed separately or simultaneously over a range of 4.5 dB to 20.25 dB in steps of 0.25 dB. The amplifier offers flat frequency performance from dc to 70 MHz, independent of gain code.

The AD8366 offers excellent spurious-free dynamic range, suitable for driving high resolution analog-to-digital converters (ADCs). The NF at maximum gain is 11.4 dB at 10 MHz and increases ~2 dB for every 4 dB decrease in gain. Over the entire gain range, the HD3/HD2 are better than −90 dBc for 2 V p-p at the output at 10 MHz into 200 Ω. The two-tone intermodulation distortion of −90 dBc into 200 Ω translates to an OIP3 of 45 dBm (38 dBVrms). The differential input impedance of 200 Ω provides a well-defined termination. The differential output has a low impedance of ~25 Ω.

The output common-mode voltage defaults to VPOS/2 but can be programmed via the VCMA and VCMB pins over a range of voltages. The input common-mode voltage also defaults to VPOS/2 but can be driven down to 1.5 V. A built-in, dc offset compensation loop can be used to eliminate dc offsets from prior stages in the signal chain. This loop can also be disabled if dc-coupled operation is desired.

The digital interface allows for parallel or serial mode gain programming. The AD8366 operates from a 4.75 V to 5.25 V supply and consumes typically 180 mA. When disabled, the part consumes roughly 3 mA. The AD8366 is fabricated using Analog Devices, Inc., advanced silicon-germanium bipolar process, and it is available in a 32-lead exposed paddle LFCSP package. Performance is specified over the −40°C to +85°C temperature range.


  • Baseband I/Q receivers
  • Diversity receivers
  • Wideband ADC drivers

    • Matched pair of differential, digitally controlled VGAs
    • Gain range: 4.5 dB to 20.25 dB
    • 0.25 dB gain step size
    • Operating frequency
         DC to 150 MHz (2 V p-p)
         3 dB bandwidth: 600 MHz
    • Noise figure (NF)
         11.4 dB at 10 MHz at maximum
         18 dB at 10 MHz at minimum
    • OIP3: 45 dBm at 10 MHz
    • HD2/HD3
         Better than −90 dBc for 2 V p-p
            output at 10 MHz at
            maximum gain
    • Differential input and output
    • Adjustable output common-mode
    • Optional dc output offset correction
    • Serial/parallel mode gain control
    • Power-down feature
    • Single 5 V supply operation

    Functional Block Diagram for AD8366


    Title Content Type File Type
    AD8366: DC to 600 MHz, Dual-Digital Variable Gain Amplifiers Data Sheet (Rev A, 03/2011) (pdf, 513 kB) Data Sheets PDF
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    Overview PDF
    RAQs index Rarely Asked Questions HTML
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    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
    AD8366 Dual-Digital Variable Gain Amplifier Linux Driver Device Drivers HTML

    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.

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    Price, packaging, availability

    Price Table Help

    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.

    AD8366 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    AD8366-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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