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AD590JH Datasheet(PDF) 8 Page - Intersil Corporation |
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AD590JH Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 10 page 12-10 The ultra-low bias current of the ICL7611 allows the use of large value gain resistors, keeping meter current error under 1/ 2%, and therefore saving the expense of an extra meter driving amplifier. See Figure 14. The 50k Ω pot trims offsets in the devices whether internal or external, so it can be used to set the size of the difference interval. this also makes it useful for liquid level detection (where there will be a measurable temperature difference). See Figure 15. The reference junction(s) should be in close thermal contact with the AD590 case. V+ must be at least 4V, while ICL8069 current should be set at 1mA - 2mA. Calibration does not require shorting or removal of the thermocouple: set R1 for V2 = 10.98mV. If very precise measurements are needed, adjust R2 to the exact Seebeck coefficient for the thermo- couple used (measured or from table) note V1, and set R1 to buck out this voltage (i.e., set V2 = V1). For other thermocou- ple types, adjust values to the appropriate Seebeck coefficient. See Figure 16. +15V 10k Ω 1k Ω + AD590 - 10mV/oC 20k Ω 44.2k Ω 0.1% ZERO SET 115k Ω 118k Ω FULL-SCALE ADJUST 100 Ω 10k Ω 2.7315V M +100 µA + - - ICL7611 FIGURE 14. CENTIGRADE THERMOMETER (0oC-100oC) FIGURE 15. DIFFERENTIAL THERMOMETER 10k Ω + NO. 1 - VOUT = (T2 - T1) x V+ 50k Ω 5M Ω 10k Ω + - + - (10mV/oC) 741 V - (8V MIN) NO. 2 V+ 1 µA/oK R2 40.2Ω SEEBECK COEFFICIENT = 40 µV/oK TYPE K VOUT + - ICL8069 1.235V 4.7 µF R1 4521Ω 40.2 Ω V+ + - TC = 40µV/ oK V1 = 10.98mV V2 = 10.98mV + - FIGURE 16. COLD JUNCTION COMPENSATION FOR TYPE K THERMOCOUPLE AD590 |
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