Rainbow-electronics LM335A User Manual

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LM135/LM235/LM335, LM135A/LM235A/LM335A
Precision Temperature Sensors
General Description
The LM135 series are precision, easily-calibrated, integrated
circuit temperature sensors. Operating as a 2-terminal zener,
the LM135 has a breakdown voltage directly proportional to
absolute temperature at +10 mV/˚K. With less than 1 dy-
namic impedance the device operates over a current range
of 400 µA to 5 mA with virtually no change in performance.
When calibrated at 25˚C the LM135 has typically less than
1˚C error over a 100˚C temperature range. Unlike other
sensors the LM135 has a linear output.
Applications for the LM135 include almost any type of tem-
perature sensing over a −55˚C to +150˚C temperature
range. The low impedance and linear output make interfac-
ing to readout or control circuitry especially easy.
The LM135 operates over a −55˚C to +150˚C temperature
range while the LM235 operates over a −40˚C to +125˚C
temperature range. The LM335 operates from −40˚C to
+100˚C. The LM135/LM235/LM335 are available packaged
in hermetic TO-46 transistor packages while the LM335 is
also available in plastic TO-92 packages.
Features
n Directly calibrated in ˚Kelvin
n 1˚C initial accuracy available
n Operates from 400 µA to 5 mA
n Less than 1 dynamic impedance
n Easily calibrated
n Wide operating temperature range
n 200˚C overrange
n Low cost
Schematic Diagram
DS005698-1
November 2000
LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors
© 2000 National Semiconductor Corporation DS005698 www.national.com
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Summary of Contents

Page 1 - Precision Temperature Sensors

LM135/LM235/LM335, LM135A/LM235A/LM335APrecision Temperature SensorsGeneral DescriptionThe LM135 series are precision, easily-calibrated, integratedci

Page 2 - Connection Diagrams

Typical Applications (Continued)Centigrade Calibrated Thermocouple ThermometerDS005698-12Terminate thermocouple reference junction in close proximity

Page 3 - Temperature Accuracy (Note 1)

Typical Applications (Continued)Differential Temperature SensorDS005698-14Variable Offset ThermometerDS005698-15†Adjust for zero with sensor at 0˚C an

Page 4

Typical Applications (Continued)Definition of TermsOperating Output Voltage: The voltage appearing acrossthe positive and negative terminals of the de

Page 5 - Application Hints

Physical Dimensions inches (millimeters) unless otherwise notedMetal Can Package (H)Order Number LM135H, LM235H, LM335H, LM135AH, LM235AH or LM335AHNS

Page 6 - DS005698-20

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)LIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITIC

Page 7

Connection DiagramsTO-92Plastic PackageDS005698-8Bottom ViewOrder Number LM335Zor LM335AZSee NS PackageNumber Z03ASO-8Surface Mount PackageDS005698-25

Page 8 - DS005698-6

Absolute Maximum Ratings (Note 4)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distribut

Page 9

Electrical Characteristics (Note 1) (Continued)Note 1: Accuracy measurements are made in a well-stirred oil bath. For other conditions, self heating m

Page 10 - (Continued)

Typical Performance Characteristics (Continued)Application HintsCALIBRATING THE LM135Included on the LM135 chip is an easy method of calibratingthe de

Page 11 - Thermometer

Typical Applications (Continued)Minimum Temperature SensingDS005698-4Average Temperature SensingDS005698-18Remote Temperature SensingDS005698-19Wire l

Page 12 - Definition of Terms

Typical Applications (Continued)Simple Temperature ControllerDS005698-5Simple Temperature ControlDS005698-21Ground Referred Fahrenheit ThermometerDS00

Page 13

Typical Applications (Continued)Fahrenheit ThermometerDS005698-24*To calibrate adjust R2 for 2.554V across LM336.Adjust R1 for correct output.THERMOCO

Page 14 - NS Package Z03A

Typical Applications (Continued)Single Power Supply Cold Junction CompensationDS005698-11*Select R3 and R4 for thermocouple typeTHERMO- R3 R4 SEEBECKC

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