180MHz, Low-Noise Fully Differential SAR ADC Driver

Industry's best combination of low power, low noise, THD, and gain bandwidth

Please check latest availability status for a specific part variant.


The MAX44205 is a low-noise, low-distortion fully differential operational amplifier suitable for driving high-speed, high-resolution, 20-/18-/16-bit SAR ADCs, including the MAX11905 ADC family. Featuring a combination of wide 2.7V to 13.2V supply voltage range and wide 400MHz bandwidth, the MAX44205 is suitable for low-power, high-performance data acquisition systems.

The MAX44205 offers a VOCM input to adjust the output common-mode voltage, eliminating the need for a coupling transformer or AC-coupling capacitors. This adjustable output common-mode voltage allows the MAX44205 to match the input common-mode voltage range of the ADC following it. A proprietary output voltage clamping solution ensures that the buffer output does not violate the ADC’s maximum input voltage range, even if the MAX44205’s supply rails are higher than the ADC’s full-scale range. Shutdown mode consumes only 6.8µA and extends battery life in battery-powered applications or reduces average power in systems cycling between shutdown and periodic data readings.

The MAX44205 is available in 12-pin, 3mm x 3mm, TQFN and 10-pin µMAX® packages and is specified for operation over the -40°C to +125°C temperature range. 

MAX44205: Typical Application Circuit MAX44205: Typical Application Circuit Enlarge+

Key Features

  • Low Input Noise to Drive Precision SAR ADCs
    • 3.1nV/√Hz at 1kHz
    • 200nVP-P from 0.1Hz to 10Hz
  • High Speed for DC and AC Applications
    • Gain-Bandwidth Product 400MHz
    • -3dB Gain-Bandwidth Product 180MHz
    • Slew Rate 180V/µs
  • Ultra-Low Distortion Drives AC Inputs to 20-Bit SAR ADCs
    • HD2 = -141dB, HD3 = -146dB at fIN = 10kHz, VOUT,DIFF = 2VP-P
    • HD2 = -106dB, HD3 = -115dB at fIN = 1MHz, VOUT,DIFF = 2VP-P
  • Output Voltage Clamping Pins Enable Low Distortion True Rail-to-Rail ADC Input Operation
  • Wide Supply Range (2.7V to 13.2V) Drives Unipolar or Bipolar (±6.6V) Signals
  • 3.7mA Quiescent Supply Current with Only 6.8µA Shutdown Current
  • 12-Pin, 3mm x 3mm TQFN and 10-Pin µMAX Packages Save Board Space


  • Active Filters
  • Fully-Differential Signal Conditioning
  • High-Speed Process Control
  • Medical Imaging
  • Single-Ended to Differential Conversion

Tools & Models

  • MAX44205 Orcad Library
  • CAD Symbols and Footprints

  • MAX44205ATC+
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


    Related Resources

    DOCSIS 3.1 Programmable-Gain Amplifier

    • Delivers +68dBmV Output Power While Meeting DOCSIS 3.1 Requirements
    • Covers 5MHz–204MHz Output Bandwidth
    • Dual Outputs Eliminates Need for an External RF Switch

    1.7V, Dual microPower Comparator with Built-In Reference

    • microPower Operating Current (Total 1.35μA (Typ), 2.55μA (Max)) Preserves Battery Power
    • Internal Precision Reference Saves Space and Cost of an External Reference
    • < 1% at Room Temperature, < 2.5% Over Temperature Reference

    Transimpedance Amplifier with 100mA Input Current Clamp for Automotive LiDAR

    • AEC-Q100
    • Enables ASIL Compliance (FMEDA Available UponRequest)
    • MAX40660

    Transimpedance Amplifier with 100mA Input Current Clamp for Automotive LiDAR

    • AEC-Q100
    • Enables ASIL Compliance (FMEDA Available UponRequest)
    • MAX40660