Common mode voltage range in true differential SAR ADCs

I know that true differential SAR ADCs usually have narrow common mode input  range around VREF. However, someADCs e. g. AD7641, AD7643, AD7644 do not specify the common mode range. Does this mean they don't have this limitation?

And in fact are there any SAR ADCs that don't have this limitation or I can save the effort to study them (and go straight for sigma-delta ADCs)?