Catalog
Oven-Compensated, Buried Zener, 7.05 V Voltage Reference
Key Features
• 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)
Description
AI
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 IREFof 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 ProductsModelOutput Voltage (V)Initial Accuracy Range (mV)ADR13997.05–300 to +250LTZ10007.2–200 to +300LM3996.95–200 to +350LT12365 and 10–2.5 to +2.5APPLICATIONSPrecision voltage reference for multimetersCalibration equipment voltage standardsLaboratory measurement equipmentIndustrial monitor and control instrumentationUltrastable data convertors