전자부품 데이터시트 검색엔진 |
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LM285BXZ-1.2 데이터시트(PDF) 6 Page - National Semiconductor (TI) |
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LM285BXZ-1.2 데이터시트(HTML) 6 Page - National Semiconductor (TI) |
6 / 10 page Typical Applications (Continued) METER THERMOMETERS 0˚C−100˚C Thermometer DS005518-28 Calibration 1. Short LM385-1.2, adjust R3 for IOUT= temp at 1 µA/˚K 2. Remove short, adjust R2 for correct reading in centigrade †IQ at 1.3V≅500 µA IQ at 1.6V≅2.4 mA Lower Power Thermometer DS005518-29 *2N3638 or 2N2907 select for inverse HFE ≅ 5 †Select for operation at 1.3V ‡IQ ≅ 600 µA to 900 µA 0˚F−50˚F Thermometer DS005518-30 Calibration 1. Short LM385-1.2, adjust R3 for IOUT= temp at 1.8 µA/˚K 2. Remove short, adjust R2 for correct reading in ˚F Micropower Thermocouple Cold Junction Compensator DS005518-31 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 52.3 523 1.24k 15.60 14.32 T 42.8 432 1k 12.77 11.78 K 40.8 412 953 Ω 12.17 11.17 S 6.4 63.4 150 Ω 1.908 1.766 Typical supply current 50 µA www.national.com 6 |
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