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AD590JCHIPS Datasheet(PDF) 10 Page - Analog Devices |
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AD590JCHIPS Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD590 Data Sheet Rev. G | Page 10 of 16 GENERAL APPLICATIONS Figure 17 shows a typical use of the AD590 in a remote temperature sensing application. The AD590 is used as a thermometer circuit that measures temperature from −55°C to +150°C, with an output voltage of 1 mV/°K. Because the AD590 measures absolute temperature (its nominal output is 1 mA/K), the output must be offset by 273.2 mA to read out in degrees Celsius. Figure 17. Variable Scale Display Connecting several AD590 units in series, as shown in Figure 18, allows the minimum of all the sensed temperatures to be indicated. In contrast, using the sensors in parallel yields the average of the sensed temperatures. Figure 18. Series and Parallel Connection The circuit in Figure 19 demonstrates one method by which differential temperature measurements can be made. R1 and R2 can be used to trim the output of the op amp to indicate a desired temperature difference. For example, the inherent offset between the two devices can be trimmed in. If V+ and V− are radically different, then the difference in internal dissipation causes a differential internal temperature rise. This effect can be used to measure the ambient thermal resistance seen by the sensors in applications such as fluid-level detectors or anemometry. Figure 19. Differential Measurements Figure 20 is an example of a cold junction compensation circuit for a Type J thermocouple using the AD590 to monitor the reference junction temperature. This circuit replaces an ice-bath as the thermocouple reference for ambient temperatures between 15°C and 35°C. The circuit is calibrated by adjusting RT for a proper meter reading with the measuring junction at a known reference temperature and the circuit near 25°C. Using components with the TCs as specified in Figure 20, compensation accuracy is within ±0.5°C for circuit temperatures between 15°C and 35°C. Other thermocouple types can be accommodated with different resistor values. Note that the TCs of the voltage reference and the resistors are the primary contributors to error. Figure 20. Cold Junction Compensation Circuit for Type J Thermocouple AD590 IT IT IT + – 7V 1k 0.1% LOW TCR RESISTOR 1mV/k AD590 + – AD590 + – AD590 + – + VT MIN 10k Ω (0.1%) – + – AD590 + – + – + VT AVG 333.3 Ω (0.1%) – 5V 15V AD590L #2 + – AD590L #1 + – R4 10k Ω R3 10k Ω R1 5M Ω R2 50k Ω V+ (T1 – T2) × (10mV/°C) V– OP177 – + + – REFERENCE JUNCTION IRON + – 7.5V AD590 AD580 CONSTANTAN MEASURING JUNCTION RESISTORS ARE 1%, 50ppm/°C METER + – – + CU 52.3 Ω 8.66k Ω VOUT RT 1k Ω |
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