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  5. ADR1000


Features and Benefits

  • High long-term stability
  • 0.5 ppm/year long-term drift, typical (after first 3000 hours)
  • Low Zener reference noise: 0.14 ppm p-p (0.9 μV p-p)
  • Low temperature coefficient: <0.2 ppm/°C
  • On-chip heater and temperature sensor
  • Specified for −40°C to +125°C operation
  • Pin‐compatible upgrade to LTZ1000

Product Details

The ADR1000 is a 6.62 V, output highly stable, oven-controlled, buried Zener reference component built on an Analog Devices, Inc., proprietary bipolar process and is a pin-compatible replacement for the LTZ1000. Included on the chip is a buried Zener reference, a heater resistor for temperature stabilization, and a temperature sensing transistor. External circuitry is used to set the operating currents and the temperature of the reference, allowing the maximum flexibility to achieve maximum long-term stability and minimum noise.

The ADR1000 application circuit can achieve a temperature coefficient of <0.2 ppm/°C and a long-term drift of 0.5 ppm per year (typical) after the first 3000 hours when properly implemented with the recommended external circuitry shown in Figure 9 in the data sheet and with the recommended layout.

The low long-term drift of the ADR1000 is well suited for any application that must maintain accuracy over long calibration intervals or product lifetime. The low thermal drift ensures the output is constant with temperature variation because the on‑chip heater of the ADR1000 maintains a constant temperature higher than the expected ambient range.

The ADR1000 is specified for operation over the extended industrial temperature range of −40°C to +125°C. To obtain the optimal thermal drift performance, the temperature set point of the heater needs to be 10°C higher than the maximum ambient temperature to provide optimum stability of the buried Zener reference.

The ADR1000 comes packaged in an industry-standard, 8-pin TO-99 metal can package that is hermetically sealed to resist the effects of humidity.


  • High accuracy instrumentation
  • Multimeters
  • Weigh scales
  • Electric balance
  • Automatic test equipment
  • Metrology equipment
  • Standard cells
  • Calibrators

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.


Models for the following parts are available in LTspice:


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
ADR1000AHZ Material Declaration Reliability Data 8-Pin TO-99
Wafer Fabrication Data

Sample & Buy

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Evaluation Boards

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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.