Hi I was designing a 3 phase inverter(750VA). So I want to sense bus voltage and phase currents using AMC1100. Here is my reference circuit given by datasheet (I have modified it with red & blue marks). Can I use same power supply for VDDR, VDDY and VDDB? Shall I use seperate power supply for VDDA? For AMC differential amplifier, is there GND need to tie VINN or will it work while left it floating? My intention is to make the circuit with minimum cost.
