Why are there negative value of CMRR in datasheet?

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chicken_feet

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Hi all,

I am using the AD7934-6 analog and digital converter ADC from Analog devices. From my little knowledge of CMRR, I am very surprised to see negative value appearing in its datasheet at Figure 13.

Are there anything that I do not know of? Cause I thought CMRR is almost always in positive? What is DMRR? There are very little information on this term on the net, care to point out some?

Thanks and have a nice day.

Best rgds,
chicken_feet
 

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