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I'm trying to amplify the voltage from an RTD (resistance temp device) using one amplifier on INA2126 using a single 5VDC supply. The circuit is attached. The 0.1VDC voltage for pin1 Is obtained from a precision voltage divider. However, on the output I only get a 0.2 mV signal whereas my input differential voltage is around 20mV and Rg was selected for greater than x100 gain. Could you tell me where I'm going wrong?
Appreciate your help.
IN2126 will not work on single supply. Use INA333.
Tim Green, SMTSPrecision Amplifiers Applications Manager
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The input common-mode of your signal is near ground, which is outside of the linear operating region of the device. Please see the graph of input common-mode range vs. output voltage on page 4 of the data sheet (lower right corner).
So, you have a few options here. First, you could put your RTD in a Wheatstone Bridge configuration. Please see slide 8 of the attached presentation.
Secondly, you may be interested in evaluating the INA326, which has rail-to-rail input and output swing.
Finally, we have integrated solutions for temperature sensing. Here are some examples: ADS1118, ADS1220, and ADS1247.
Applications Manager, General Purpose Amplifiers
In reply to Pete%20Semig:
Thanks, this helps a lot.
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