DESCRIPTION
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.

FEATURES
■ 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

APPLICATIONS
■ Precision Voltage Reference for Multimeters
■ Calibration Equipment Voltage Standards
■ Laboratory Measurement Equipment
■ Industrial Monitor/Control Instruments
■ High Accuracy Data Converters