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LM385-1.2 датащи(PDF) 7 Page - National Semiconductor (TI) |
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LM385-1.2 датащи(HTML) 7 Page - National Semiconductor (TI) |
7 / 11 page Typical Applications (Continued) METER THERMOMETERS 0˚C−100˚C Thermometer 00551828 Calibration 1. Short LM385-1.2, adjust R3 for IOUT= temp at 1µA/˚K 2. Remove short, adjust R2 for correct reading in centigrade †IQ at 1.3V.500µA IQ at 1.6V.2.4mA Lower Power Thermometer 00551829 *2N3638 or 2N2907 select for inverse HFE . 5 †Select for operation at 1.3V ‡IQ . 600µA to 900µA 0˚F−50˚F Thermometer 00551830 Calibration 1. Short LM385-1.2, adjust R3 for IOUT= temp at 1.8µA/˚K 2. Remove short, adjust R2 for correct reading in ˚F Micropower Thermocouple Cold Junction Compensator 00551831 Adjustment Procedure 1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient. 2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2. Thermocouple Seebeck R1 R2 Voltage Voltage Type Coefficient ( Ω)(Ω) Across R1 Across R2 (µV/˚C) @ 25˚C (mV) (mV) J 52.3 5231.24k 15.60 14.32 T 42.8 432 1k 12.77 11.78 K 40.8 412953 Ω 12.17 11.17 S 6.4 63.4150 Ω 1.908 1.766 Typical supply current 50µA www.national.com 7 |
Аналогичный номер детали - LM385-1.2 |
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Аналогичное описание - LM385-1.2 |
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