How much does the output change in V and in % of full scale movement of the sensor.
How much does the temperature of the AD698 change as it warms up.
I'm also having same problem in my circuitry. Have you solved it? It would be good if you can share solution.
I am using AD698 for my project. In that project, I am using micro-epsilon full bridge LVDT with excitation frequency of 5KHz and the effective voltage as 2.52V, I am using the same circuitry as it shown in datasheet of AD698.
But the problem is, as I start my system, the voltage at the output of AD698 starts decreasing without any movement of LVDT as IC gets heated. If I place a finger over AD698, the output voltage again starts increasing and if I remove my finger it starts decreasing again. After some time like 5 to 10 min it gates stable.
I want a stable output as soon as system starts which only change as my LVDT moves.
I don't know what to do, to detect the cause of problem or how to solve this issue.
Thank you in advance,