digital thermometer with remote sensor
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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. The AD8541 is a low-cost, low-power, rail-to-rail operational amplifier. It has a high common-mode voltage range and extremely low bias currents. You can calibrate out its 1-mV typical offset, the resistor, and AD590 errors. The output swing of the amplifier is 25 mV to 4.965V with a single 5V power supply, limiting the output by about 0.5°C on either end.
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