As for your Analog Switch ADG451,
if we drive as following condition, then how will your VINH/VINL change?
when VL=+5V, then VINH=2.8Vmin, VINL=0.8Vmin
Does VINH and VINL increase?
VDD=+15V、VSS=-15V、VIN=0V / +15V, VL=+15V
As for ABS. MAX.ratiing, no problem.
increase consumption current? or not?
The application note AN-680 will be of use to you here. It shows the threshold levels with respect to VL.