I am looking to use your AD698 for a project to convert an LVDT signal. I am struggling with the workings of this chip and have noticed some peculiar details with pin 2 and 3.
firstly, the wave shape I expect is severely distorted. Instead of a sine wave, I'm getting something that resembles a switching spike in my wave. Secondly, as my move the plunger in my LVDT, the excitation signal is changing in amplitude. I don't know if the latter is normal operation for this chip or not.
I'm using this chip in single supply mode configuration. My excitation signal does not change if I have a Vin of 18V to 32V.
My output of the chip is also not what I expect, but that's likely from the excitation being odd, or that I have the chip hooked up incorrectly.
Any help you could offer in this matter would be appreciated.
Thanks for your time.