LM399_15 Datasheet, PDF (1/8 Pages) Linear Technology – Precision Reference

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 volt-
age, 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 volt-
meters, 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
10V
3+
4
20k
0.1%
LM199 TA01a
Reverse Voltage Change
8
7
6
5
STABILIZED
(T_J ≈ 90°C)
4
T_J = 25°C
3
2
1
0
0
2
4
6
8
10
REVERSE CURRENT (mA)
LM199 TA01b
For more information www.linear.com/LM399
199399fc
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