I have been using the SD16_A on the MSP430F47197 for a load cell application. I have been using a front end like the one found in the attached image. However, I have noticed that the signal takes quite a few samples to settle and shows a slow, RC-like response while settling. I am using the SD16_A with OSR=1024 and continuous grouped samples throwing away the first four conversions. Is there a limit on the values of the RC anti-alias low pass filter directly in front of the converter? I am using 1kohm and 0.1uF for the RC filter. Is this a problem considering that the SD16_A is not buffered? I am also using an external reference fed from the load cell supply through a resistor divider. Is there any limit on the input resistance of the reference voltage? Is this also a switched capacitor input? Also, I am using the same op amp as in the schematic (ADA4528-1). Any suggestions as to what may be causing this settling/drift would be greatly appreciated.
Many thanks!