ADR435:  Ultralow Noise XFET® Voltage References with Current Sink and Source Capability

The ADR43x series is a family of XFET voltage references featuring low noise, high accuracy, and low temperature drift performance. Using Analog Devices, Inc., patented temperature drift curvature ...More

ADR435:  Ultralow Noise XFET® Voltage References with Current Sink and Source Capability

Product Description

The ADR43x series is a family of XFET voltage references featuring low noise, high accuracy, and low temperature drift performance. Using Analog Devices, Inc., patented temperature drift curvature correction and XFET (eXtra implanted junction FET) technology, voltage change vs. temperature nonlinearity in the ADR43x is minimized.

The XFET references operate at lower current (800 µA) and supply headroom (2 V) than buried Zener references. Buried Zener references require more than 5 V headroom for operations. The ADR43x XFET references are the only low noise solutions for 5 V systems.

The ADR43x family has the capability to source up to 30 mA of output current and sink up to 20 mA. It also comes with a trim terminal to adjust the output voltage over a 0.5% range without compromising performance.

The ADR43x is available in 8-lead MSOP and narrow SOIC packages. All versions are specified over the extended industrial temperature range of −40°C to +125°C.

Applications

  • Precision data acquisition systems
  • High resolution data converters
  • Medical instruments
  • Industrial process control systems
  • Optical control circuits
  • Precision instruments

    • Features

    • Low noise (0.1 Hz to 10.0 Hz):
      3.5 µV p-p @ 2.5 V output
    • No external capacitor required
    • Low temperature coefficient
      A Grade: 10 ppm/°C maximum
      B Grade: 3 ppm/°C maximum
    • Load regulation: 15 ppm/mA
    • Line regulation: 20 ppm/V
    • Wide operating range:
      ADR430: 4.1 V to 18 V
      ADR431: 4.5 V to 18 V
      ADR433: 5.0 V to 18 V
      ADR434: 6.1 V to 18 V
      ADR435: 7.0 V to 18 V
      ADR439: 6.5 V to 18 V
    • High output source and sink current:
      +30 mA and −20 mA
    • Wide temperature range: −40°C to +125°C

    Verified Circuits Using This Part

    Verified Circuits are designed for ease of use and proven to work by ADI applications engineers. To learn more about Verified Circuits from ADI, please visit Verified Circuits Home.

    Circuit Diagram

    Diagrams

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    • Symbols and Footprints
    ADR435 Diagram
    Pin Configuration Diagram for ADR435

    Specifications

    Vout 5
    Initial Accuracy (%) 0.04
    Ref Out TC (ppm/C) 1ppm/C
    Supply Voltage Range (V) +7.0 to +18
    Supply Current (max) 800µA
    Ref Output Current (mA) 30mA
    0.1-10 Hz Noise (µV p-p) 8µV p-p
    Temp Range(s) -40 to +125
    Package MSOP,SOIC
    Reference Type Series

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