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Features and Benefits

  • 7.05 V ultrastable shunt reference
  • Low temperature coefficient: 0.2 ppm/°C
  • Maximum dynamic impedance: 0.08 Ω
  • Typical reference noise for 10 Hz < f < 1 kHz: 1.84 μV rms
  • Initial accuracy range: –300 mV to +250 mV
  • Available in 4-lead TO-46 metal can
  • External thermal insulator provided
  • Upgrade path for legacy LM399

Product Details

The ADR1399 precision shunt reference features excellent temperature stability over a wide range of voltage, temperature, and quiescent current conditions. A temperature stabilizing loop is incorporated with the active Zener on a monolithic substrate, which nearly eliminates changes in voltage with temperature. The subsurface Zener circuit is fully specified at a quiescent current IREF of 3 mA and offers minimal noise (1.44 μV p-p, 0.1 Hz to 10 Hz) and excellent long-term stability (7 ppm/√kHr). The ADR1399 offers much lower output dynamic impedance (0.08 Ω) than the LM399, reducing the effects of shunt resistor (RSHUNT) and the supply voltage variation on the reference output.

Ideal applications for the ADR1399 include ultrastable digital voltmeters, precision calibration equipment, and ultrarepeatable analog-to-digital converters (ADCs). The simplicity of the basic pin configuration is shown in Figure 1.

Table 1. Related Products
Model Output Voltage (V) Initial Accuracy Range (mV)
ADR1399 7.05 –300 to +250
LTZ1000 7.2 –200 to +300
LM399 6.95 –200 to +350
LT1236 5 and 10 –2.5 to +2.5


  • Precision voltage reference for multimeters
  • Calibration equipment voltage standards
  • Laboratory measurement equipment
  • Industrial monitor and control instrumentation
  • Ultrastable data convertors

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.

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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.