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LM335 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. LM335
Description  PRECISION TEMPERATURE SENSORS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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APPLICATION HINTS
There is an easy method of calibrating the device for
higher accuracies (see typical applications).
The single point calibration works because the out-
put of the LM135, LM235, LM335 is proportional to
the absolute temperature with the extrapolated out-
put of sensor going to 0V at 0
oK ( –273.15oC). Errors
in outputvoltage versus temperature are only slope.
Thus a calibration of the slope at one temperature
corrects errors at all temperatures.
The output of the circuit (calibrated or not) can be
given by the equation : VOT
= VOTO x
T
To
where T is the unknown temperature and TO is the
reference temperature (in
oK).
Nominally the output is calibrated at 10mV/
oK.
Precautions should be taken to ensure good sens-
ing accuracy. As in the case of all temperaturessen-
sors, self heating can decrease accuracy. The
LM135, LM235, LM335 should operate with a low
current, but sufficient to drive the sensor and its cali-
bration circuit to their maximum operating tempera-
ture.
If the sensor is used in surroundings where the ther-
mal resistane is constant,the errors due to self heat-
ing can be externally calibrated. This is possible if
the circuit is biased with a temperature stable cur-
rent. Heating will then be proportional to zener volt-
age and therefore temperature. In this way the error
due to self heating is proportional to the absolute
temperature as scale factor errors.
LM135
LM235
LM335
V
R1
Output
10mV/
°K
TYPICAL APPLICATIONS
BASIC TEMPERATURE SENSOR
Vi
+5 to +40V
LM134, LM234
LM334
68
LM135
LM235
LM335
Output
10mV/
°K
WIDE OPERATING SUPPLY
LM135
LM235
LM335
V
R1
Output
10mV/
°K
10k
Ω*
* Calibrate for 2.982V at +25
oC
CALIBRATED SENSOR
LM135
LM235
LM335
6k
Output
30mV/
°K
+15V
AVERAGE TEMPERATURE SENSING
LM135-LM235-LM335,A
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