QI want to use the ADUM4190 as AC line voltage monitor at 50/60Hz with voltage
on shunt up to 500Vac. Do you have more preciese phase shift data, than that
shown in Figures 30 and 31 in Datasheet?
AFor your application "line voltage monitoring at 50/60Hz", I think the phase
shift can be ignored. From measurement, it looks like the input/output delay of
Figure 29 is several microseconds, so I think it is hard to observe for an
input signal at 50/60Hz.
Figures 30 and 31 are used to sketch the bode plot and demonstrate why we need
an integrator connected for the close loop test.