1. Products
  2. Analog Functions
  3. Voltage References
  4. Shunt Voltage References
  5. ADR1399


Features and Benefits

  • 7.05 V ultrastable shunt reference
  • Low temperature coefficient: 0.2 ppm/℃
  • Available in 4-pin TO-46 and 8-terminal LCC
  • Typical reference noise for 10 Hz < f < 1 kHz: 1.84 μV rms
  • Initial accuracy range: –300 mV to +250 mV
  • Low dynamic impedance: 0.04 Ω in TO-46, 0.011 Ω in LCC
  • External thermal insulator provided for TO-46
  • Upgrade path for legacy LM399, now also in surface-mount technology (SMT)

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 a 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 configurations is shown in Figure 1. The 8-terminal LCC version offers force and sense pins for lower dynamic impedance and for Kelvin sensing.

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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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
ADR1399KEZ Material Declaration Reliability Data 8-Lead LCC (5mm x 5mm)
ADR1399KHZ Material Declaration Reliability Data 4-Lead TO-46
Wafer Fabrication Data

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