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LM335 Datasheet(PDF) 8 Page - Texas Instruments

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Part No. LM335
Description  LMx35, LMx35A Precision Temperature Sensors
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM135, LM135A, LM235, LM235A, LM335, LM335A
SNIS160E – MAY 1999 – REVISED FEBRUARY 2015
www.ti.com
7 Detailed Description
7.1 Overview
Applications for the LM135 include almost any type of temperature sensing over a
−55°C to 150°C temperature
range. The low impedance and linear output make interfacing 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.
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-
Ω dynamic 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.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Temperature Calibration Using ADJ Pin
Included on the LM135 chip is an easy method of calibrating the device for higher accuracies. A pot connected
across the LM135 with the arm tied to the adjustment terminal (as shown in Figure 12) allows a 1-point
calibration of the sensor that corrects for inaccuracy over the full temperature range.
This single point calibration works because the output of the LM135 is proportional to absolute temperature with
the extrapolated output of sensor going to 0-V output at 0 K (
−273.15°C). Errors in output voltage versus
temperature are only slope (or scale factor) errors so a slope calibration at one temperature corrects at all
temperatures.
The output of the device (calibrated or uncalibrated) can be expressed as:
where
8
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Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM135 LM135A LM235 LM235A LM335 LM335A




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