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  2. Amplifiers
  3. Variable Gain Amplifiers (VGA)
  4. Analog Control Variable Gain Amplifiers (VGAs)
  5. AD8331


Overview

Features and Benefits

  • Ultralow noise preamplifier (preamp)
    • Voltage noise = 0.74 nV/√Hz
    • Current noise = 2.5 pA/√Hz
  • 3 dB bandwidth: 120 MHz
  • Low power: 125 mW/channel
  • Wide gain range with programmable postamp
    • −4.5 dB to +43.5 dB in LO gain mode
    • 7.5 dB to 55.5 dB in HI gain mode
  • Low output-referred noise: 48 nV/√Hz typical
  • Active input impedance matching
  • Optimized for 10-bit/12-bit ADCs
  • Selectable output clamping level
  • Single 5 V supply operation

Product Details

The AD8331 is a single channel, ultralow noise, linear-in-dB, variable gain amplifier (VGA). Optimized for ultrasound systems, it is usable as a low noise variable gain element at frequencies up to 120 MHz.

Included is an ultralow noise preamplifier (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamplifier with adjustable output limiting. The LNA gain is 19 dB with a single-ended input and differential outputs. Using a single resistor, the LNA input impedance can be adjusted to match a signal source without compromising noise performance.

The 48 dB gain range of the VGA makes these devices suitable for a variety of applications. Excellent bandwidth uniformity is maintained across the entire range. The gain control interface provides precise linear-in-dB scaling of 50 dB/V for control voltages between 40 mV and 1 V. Factory trim ensures excellent part-to-part and channel-to-channel gain matching. Differential signal paths result in superb second- and third-order distortion performance and low crosstalk.

The operating temperature range is -40°C to +85°C. The AD8331 is available in a 20-lead QSOP package.

The AD8331 is a single version of the dual AD8332 and quad AD8334.

For information on specs, see the AD8331/AD8332/AD8334 datasheet.

Applications

  • Ultrasound and sonar time-gain controls
  • High performance automatic gain control (AGC) systems
  • I/Q signal processing
  • High speed, dual ADC drivers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Documentation & Resources

  • View All (11)
  • Evaluation Design File (1)
  • Data Sheet (3)
  • Application Note (1)
  • Frequently Asked Question (1)
  • Tutorial (1)
  • Product Selection Guide (1)
  • Circuit Note (1)
  • Technical Article (2)
  • Tools & Simulations

    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.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD8331ARQZ Material Declaration Reliability Data 20-Lead QSOP
    AD8331ARQZ-R7 Material Declaration Reliability Data 20-Lead QSOP
    AD8331ARQZ-RL Material Declaration Reliability Data 20-Lead QSOP
    AD8331TRQZ-EP Material Declaration Reliability Data 20-Lead QSOP
    AD8331TRQZ-EP-R7 Material Declaration Reliability Data 20-Lead QSOP
    Wafer Fabrication Data

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    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.