We have recently found that there are errors in the factory-default coefficients of three FIR filter banks (A, C, D) in the ADIS16375. For those who are relying on the factory-default FIR filter responses, you can access the correct coefficient values at this link and write them to the appropriate registers through the SPI port. For those who are not using the FIR filter banks or are using your own FIR coefficient values, this issue will have no impact on you.
Silicon Anomaly is being drafted and will eventually serve as our official communication on this matter, but I didn't want to delay this notice.
I hope that this helps.