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OPA855: 0.001% settling time

Part Number: OPA855

Dear team,

In the datasheet of OPA855, I noticed that the 0.001% settling time is also indicated in the datasheet. However, in our application which use the OPA855 as TIA, we only focus on the 0.1% settling time instead of the  0.001% settling time. Is this  0.001% settling time mean somthing for the TIA application? If not, why you put this spec on the datasheet? 

I am curious about that. Looking forward to your anwser. Thanks!

Best regards

Wesley