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LM334AD Datasheet(PDF) 7 Page - STMicroelectronics |
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LM334AD Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 16 page LM134-LM234-LM334 Application information 7/16 4.6 Sensing temperature The LM134, LM234, LM334 are excellent remote controlled temperature sensors because their operation as current sources preserves their accuracy even in the case of long connecting wires. The output current is directly proportional to the absolute temperature in Kelvin degrees according to the following equation. The calibration of the LM134, LM234, LM334 is simplified by the fact that most of the initial accuracy is due to gain limitation (slope error) and not an offset. Gain adjustment is a one point trim because the output of the device extrapolates to zero at 0°K. Figure 10. Device calibration This particularity of the LM134, LM234, LM334 is illustrated in the above diagram. Line abc represents the sensor current before adjustment and line a’b’c’ represents the desired output. A gain adjustment provided at T2 will move the output from b to b’ and will correct the slope at the same time so that the output at T1 and T3 will be correct. This gain adjustment can be carried out by means of Rset or the load resistor used in the circuit. After adjustment, the slope error should be less than 1%. A low temperature coefficient for Rset is necessary to keep this accuracy. A 33ppm/°C temperature drift of Rset will give an error of 1% on the slope because the resistance follows the same temperature variations as the LM134, LM234, LM334. Three wires are required to isolate Rset from the LM134, LM234, LM334. Since this solution is not recommended, metal-film resistors with a drift of less than 20ppm/°C are now available. Wirewound resistors can be used when very high stability is required. I set = 227µV/°K) (T () R set ----------------------------------------- |
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