LM399

Precision Reference

* 6.95V Shunt Reference

* Guaranteed 0.5ppm/°C Temperature Coeffi cient

* Guaranteed 1Ω Maximum Dynamic Impedance

* Guaranteed 20µVRMS Maximum Noise

* Guaranteed Initial Tolerance of 2%

* Wide Operating Current Range

* Available in 4-Lead TO-46 Metal Can

The LM199/LM399 precision shunt reference features excellent temperature stability over a wide range of voltage, temperature and operating current conditions. A stabilizing heater is incorporated with the active Zener on a monolithic substrate which nearly eliminates changes in voltage with temperature. The subsurface Zener operates over a current range of 0.5mA to 10mA, and offers minimal noise and excellent long-term stability. Ideal applications for the LM199/LM399 include digital voltmeters, precision calibration equipment, current sources and a variety of other precision low cost references. A 10V buffered reference application is shown below. Applications

* Precision voltage reference for multimeters

* Calibration equipment voltage standards

* Laboratory measurement equipment

* Industrial monitor/control instruments

* High accuracy data converters