ADR441:  Ultralow Noise, LDO XFET Voltage Reference with Current Sink and Source

The ADR44x series is a family of XFET® voltage references featuring ultralow noise, high accuracy, and low temperature drift performance. Using Analog Devices, Inc., patented temperature drift ...More

ADR441:  Ultralow Noise, LDO XFET Voltage Reference with Current Sink and Source

Product Description

The ADR44x series is a family of XFET® voltage references featuring ultralow 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 ADR44x is greatly minimized.

The XFET references offer better noise performance than buried Zener references, and XFET references operate off low supply voltage headroom (0.5 V). This combination of features makes the ADR44x family ideally suited for precision signal conversion applications in high-end data acquisition systems, optical networks, and medical applications.

The ADR44x family has the capability to source up to 10 mA of output current and sink up to −5 mA. It also comes with a trim terminal to adjust the output voltage over a 0.5% range without compromising performance.

Offered in two electrical grades, the ADR44x family is avail-able 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
  • Battery-powered instrumentation
  • Portable medical instruments
  • Industrial process control systems
  • Precision instruments
  • Optical control circuits

    • Data Sheet, Rev. C, 3/08

    Features

    • Ultralow noise (0.1 Hz to 10 Hz)
      ADR440: 1 μV p-p
      ADR441: 1.2 μV p-p
      ADR443: 1.4 μV p-p
      ADR444: 1.8 μV p-p
      ADR445: 2.25 μV p-p
    • Low dropout operation: 500 mV
    • Superb temperature coefficient
      A Grade: 10 ppm/°C
      B Grade: 3 ppm/°C
    • Input range: (VOUT + 500 mV) to 18 V
    • High output source and sink current
      +10 mA and −5 mA, respectively
    • 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

    ADR441 Diagram
    Pin Configuration Diagram for ADR441

    Specifications

    Vout 2.5
    Initial Accuracy (%) 0.04
    Ref Out TC (ppm/C) 1ppm/C
    Supply Voltage Range (V) +3 to +18
    Supply Current (max) 3.75mA
    Ref Output Current (mA) 10mA
    0.1-10 Hz Noise (µV p-p) 1.2µV p-p
    Temp Range(s) -40 to +125
    Package DIP,MSOP,SOIC
    Reference Type Series-Low Dropout

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