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ADS5400-SP: Datasheet Clarification Abs Max differentials

Part Number: ADS5400-SP

Team, 

I need a favor.  Referring to ABSOLUTE MAXIMUM RATINGS on page 2 of the attached file.

The absolute maximum rating across (differential voltage) AINP & AINN for both AC and DC have a range, instead of a single number.  

For example, for AC: 1.25V to 3.75V, if the device will not be damaged with ±3.75V across input stage,what does ±1.25V. refer to aka  What is the lower number for in these specs? Same for DC case.

 Thank you for your help.