I am currently making some calculations and also simulations on a PT100 circuit, the circuit itself and calculations are not an issue, but I am trying to look at the best rail to rail opamp. An image of the circuit is below:
Currently the university were I am studying has TLV272 and I intend to build a prototype for calibration and testing, with tweaked values pending what 1% resistors we have.
What I am interested in is the benefits of using an OPA188 opamp as opposed to the TLV272, I don't have a Pspice model for the OPA188 so cannot check. I know the OPA188 is stated as low noise, I don't believe parameters which are speed related are an issue here as it's a low speed signal conditioning circuit. Input current yes so Iq per channel, not sure the significance of IIB as the value seems counter intuitive to me and not sure I fully understand the implications of a large or small value here?
Any further advise would be welcome, I am also thinking of adding a small pre-amp stage to boost the range of the output, then add this circuit afterwards as have 2 Opamps per package.