AD8310 DC-coupled input slope

Hi everyone,

I want to use AD8310 for measuring very low amplitude DC voltage in high dynamic range. I connected AD8310 to differential output of ADL5391. With potentiometer connected to OFLT pin of AD8310 I trimmed input ofset for gaining maximum dynimic range. Everything works fine but I cant understand why slope for DC coupling is 480 mv/decade whereas for AC coupling 240 mv/decade, it's narrows dynamic range twice. Is it possible to make slope 240 mv/decade for DC coupled connection?

                   DC coupled                                                                 AC coupled

Sorry for my poor English and thank you for your help.

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