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Circuit Diagram for Celsius-to-Digital Thermometer using AD590 Temperature Sensor
Saturday, 25. July 2009 by
wire
The following circuit diagram is designed by Elana Lian and Chau Tran from Analog Device. The circuit includes T1, a low-cost AD590 temperature sensor; IC1, an AD8541 rail-to-rail amplifier; four resistors; a trimming potentiometer; and an ADC. The AD590 is a 2-terminal integrated circuit temperature transducer that produces an output current proportional to absolute temperature. The AD590 provides an output current proportional to absolute temperature (1 µA/K). In this application, the circuit offsets and scales the output to provide a full-scale range of 0 to 5V with a scale factor of 50 mV/°C over the chosen temperature range of 0°C—the freezing point of water—to 100°C, the boiling point of water.
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