PRECISION，LINEARIZED_PLATINUM_RTD_SIGNAL_CONDITIONER

Published:2009/7/6 21:34:00 Author:May | From:SeekIC

The circuit provides complete, linearized signal conditioning for a platinum RTD.This LTC1043 based circuit is considerably simpler than instrumentation or multi-amplifier based designs, and will operate form a single 5 V supply. A1 serves as a voltage-controlled ground referred current source by differentially sensing the voltage across the 998 phm feedback resistor. The LTC1043 section which does this presents a single-ended signal to A1's negative input, closing a loop. The 2 k 0.1 μF combination sets amplifier roll-off well below the LTC1043's switching frequency and the configuration is stable. Because A1's loop forces a fixed voltage across the 887 ohm resistor, the current through Rp is constant. A1's operating point is primarily fixed by the 2.5 V LT1009 voltage reference.



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