Other Parts Discussed in Thread: LM10, TLV9002, TINA-TI
I have built a very simple differential amplifier with the TLV9052. The inputs are 220K Ohm and the two feedback resistors are 470k ohm. The inputs connect to two metal probes that are 12mm apart from each other and not connected. They are in a magnetic field that a conductive fluid passed through. The fluid contacts the probes and a current conducts across between the two. The measured output voltage is in the 50 mv up to 200 mv range. We get some low frequency baseline wandering of this signal for reasons not quite understood at this point. But I digress.
We were fairly successful getting a good signal with the LM10 op amp from this arrangement. Now that I have the TLV9052IDR in hand and the circuit assembled, when I power it up( 1.8VDC - pin 8 at 1.8VDC, pin 4 at ground), the output is 1.8VDC. To make sure the IC isn't completely damaged, I have used the same chip and built a simple inverting amplifier with the same pins and it works fine).
I've tripled checked resistor values and connections with an ohm meter and they are all good.
What could be causing this issue?