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LM335Z Fiches technique(PDF) 6 Page - STMicroelectronics |
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LM335Z Fiches technique(HTML) 6 Page - STMicroelectronics |
6 / 11 page 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 Ω 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 Ω Output 30mV/ °K +15V AVERAGE TEMPERATURE SENSING LM135-LM235-LM335,A 6/11 |
Numéro de pièce similaire - LM335Z |
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Description similaire - LM335Z |
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