I am using AD7682 as an ADC and using its external voltage reference mode.
The external voltage reference is buffered by AD4841-2 dual OpAmp.
I power the AD4841 with +- 5.040V power supply. The voltage reference is +5.006V.
However, after buffered by AD4841, the +5.006V reference only becomes +4.386V.
It seems that AD4841 is not rail-to-rail,
Could anyone help on this?