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LM335 Folha de dados(PDF) 5 Page - National Semiconductor (TI) |
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LM335 Folha de dados(HTML) 5 Page - National Semiconductor (TI) |
5 / 14 page Typical Performance Characteristics (Continued) Application Hints CALIBRATING THE LM135 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 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 ex- trapolated output of sensor going to 0V 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 T is the unknown temperature and T o is a reference temperature, both expressed in degrees Kelvin. By calibrat- ing the output to read correctly at one temperature the output at all temperatures is correct. Nominally the output is cali- brated at 10 mV/˚K. To insure good sensing accuracy several precautions must be taken. Like any temperature sensing device, self heating can reduce accuracy. The LM135 should be operated at the lowest current suitable for the application. Sufficient current, of course, must be available to drive both the sensor and the calibration pot at the maximum operating temperature as well as any external loads. If the sensor is used in an ambient where the thermal resis- tance is constant, self heating errors can be calibrated out. This is possible if the device is run with a temperature stable current. Heating will then be proportional to zener voltage and therefore temperature. This makes the self heating error proportional to absolute temperature the same as scale factor errors. WATERPROOFING SENSORS Meltable inner core heat shrinkable tubing such as manufac- tured by Raychem can be used to make low-cost waterproof sensors. The LM335 is inserted into the tubing about 1⁄2" from the end and the tubing heated above the melting point of the core. The unfilled 1⁄2" end melts and provides a seal over the device. Typical Applications Thermal Response in Stirred Oil Bath DS005698-36 Forward Characteristics DS005698-37 Basic Temperature Sensor DS005698-2 Calibrated Sensor DS005698-9 *Calibrate for 2.982V at 25˚C Wide Operating Supply DS005698-10 www.national.com 5 |
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