I would like to use ADA4891.
So, I simulated using LTSpice, but the + side of the output voltage will saturate halfway.
This IC should be a product of Rail to Rail.
Is the contents of this model correct?
True, ADA4891 is Rail-to-Rail Out but not Rail-to-Rail In. If you would check on the specifications table, you will see that there is a 800mV headroom from positive supply (+Vs). In buffer configuration, it is the IVR that will dictate the range of operation for the amplifier.