AD7691 Pulsar Differential ADC Common Mode Input Spec

AD7691 spec sheet says Common-Mode Range needs to be Vref/2 +-0.1V.

I have a system who's inputs to the ADC is In-=0.1V In+=1.4V(up to 1.8V), and I don't see any issues due to this.

Can someone help me understand when this specification is important.

My guess is that it has to due with the input voltage range and max input voltage.  Is this spec just to ensure a full range (+-Vref) signal stays within the absolute input voltage range?

Thanks in advance,

Shane

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