LM199

LM199/LM399 LM199A/LM399A Precision Reference Features nn 6.95V Shunt Reference nn Guaranteed 0.5ppm/°C Temperature Coefficient nn Guaranteed 1Ω Maximum Dynamic Impedance nn Guaranteed 20µVRMS Maximum Noise nn Guaranteed Initial Tolerance of 2% nn Wide Operating Current Range nn Available in 4-Lead TO-46 Metal Can Applications nn Precision Voltage Reference for Multimeters nn Calibration Equipment Voltage Standards nn Laboratory Measurement Equipment nn Industrial Monitor/Control Instruments nn High Accuracy Data Converters 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. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 10V Buffered Reference 15V 7.5k 5% 9k 0.1% +3 1 LM399H 6.95V –4 2 2– 7 6 LT®1001 1...