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AD590JR Datasheet(PDF) 10 Page - Analog Devices |
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AD590JR Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD590 Rev. E | Page 10 of 16 GENERAL APPLICATIONS Figure 16 demonstrates the use of a low cost digital panel meter for the display of temperature on either the Kelvin, Celsius, or Fahrenheit scales. For Kelvin temperature, Pin 9, Pin 4, and Pin 2 are grounded; for Fahrenheit temperature, Pin 4 and Pin 2 are left open. 6 5 9 4 2 OFFSET CALIBRATION 5V GAIN SCALING OFFSET SCALING 3 8 AD2040 GND AD590 + – Figure 16. Variable Scale Display The above configuration yields a 3-digit display with 1°C or 1°F resolution, in addition to an absolute accuracy of ±2.0°C over the −55°C to +125°C temperature range, if a one-temperature calibration is performed on an AD590K, AD590L, or AD590M. Connecting several AD590 units in series, as shown in Figure 17, 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. AD590 + – AD590 + – AD590 + – + VT MIN 10kΩ (0.1%) – + – AD590 + – + – + VT AVG 333.3Ω (0.1%) – 5V 15V Figure 17. Series and Parallel Connection The circuit in Figure 18 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. AD590L #2 + – AD590L #1 + – R4 10kΩ R3 10kΩ R1 5MΩ R2 50kΩ V+ (T1 – T2) × (10mV/°C) V– AD707A – + Figure 18. Differential Measurements Figure 19 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 19, 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. + – REFERENCE JUNCTION IRON + – 7.5V AD590 AD580 CONSTANTAN MEASURING JUNCTION RESISTORS ARE 1%, 50ppm/°C METER + – – + CU 52.3Ω 8.66kΩ VOUT RT 1kΩ Figure 19. Cold Junction Compensation Circuit for Type J Thermocouple |
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