Hi,
I am currently using an INA321 Instrumentation amplifier with a Metallux CPS 1010 16Bar Pressure Sensor. However, I am struggling with a drift situation where the voltage I am receiving from the INA321 tends to drift. Once calibrated the sensor seems to drift by more than 5kPA in a sinusoidal fashion. The period of this drift is in the order of seconds. Is there someone at TI that I can email the schematics and discuss the design in order to determine the problem?
The issue seems gain dependent, however, the issue does not seem to be with the sensor (if I have no differential input voltage with the signal biased to within its common-mode voltage range I get the same drift. I did this with just a resistive divider). Also the drift doesn't seem to be occurring from the reference input, as bypassing the instrumentation amplifier and applying this directly to my ADC results in no drift behavior. Also, connecting the ADC with a simple pot as a voltage input results in a stable reading which leads me to believe the issue isn't firmware.
Sorry for being a little vague, I can be more specific via email, but I can't seem to find any contact details for support via email.
Regards,
Gavin
