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LM399

National Semiconductor
Part Number LM399
Manufacturer National Semiconductor
Description Precision Reference
Published Mar 22, 2005
Detailed Description LM199/LM299/LM399 Precision Reference April 2005 LM199/LM299/LM399 Precision Reference General Description The LM199 s...
Datasheet PDF File LM399 PDF File

LM399
LM399

Overview
LM199/LM299/LM399 Precision Reference April 2005 LM199/LM299/LM399 Precision Reference General Description The LM199 series are precision, temperature-stabilized monolithic zeners offering temperature coefficients a factor of ten better than high quality reference zeners.
Constructed on a single monolithic chip is a temperature stabilizer circuit and an active reference zener.
The active circuitry reduces the dynamic impedance of the zener to about 0.
5Ω and allows the zener to operate over 0.
5 mA to 10 mA current range with essentially no change in voltage or temperature coefficient.
Further, a new subsurface zener structure gives low noise and excellent long term stability compared to ordinary monolithic zeners.
The package is supplied with a thermal shield to minimize heater power and improve temperature regulation.
The LM199 series references are exceptionally easy to use and free of the problems that are often experienced with ordinary zeners.
There is virtually no hysteresis in reference voltage with temperature cycling.
Also, the LM199 is free of voltage shifts due to stress on the leads.
Finally, since the unit is temperature stabilized, warm up time is fast.
The LM199 can be used in almost any application in place of ordinary zeners with improved performance.
Some ideal applications are analog to digital converters, calibration standards, precision voltage or current sources or precision power supplies.
Further in many cases the LM199 can replace references in existing equipment with a minimum of wiring changes.
The LM199 series devices are packaged in a standard hermetic TO-46 package inside a thermal shield.
The LM199 is rated for operation from −55˚C to +125˚C while the LM299 is rated for operation from −25˚C to +85˚C and the LM399 is rated from 0˚C to +70˚C.
Features n Guaranteed 0.
0001%/˚C temperature coefficient n Low dynamic impedance — 0.
5Ω n Initial tolerance on breakdown voltage — 2% n Sharp breakdown at 400 µA n Wide operating current — 500 µA ...


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