I have a design using the ADE7753, and having a problem with the Voltage Inputs (V2P, V2P) and the attenuation network.
The attenuation network is the same as on the ADE7753EB. The V2N input is connected to AGND (through a 1K resistor), but not connected to NEUTRAL (i,e, in ADE7753EB figure 6 there is no connection between SK1.1 and NEUTRAL).
This connection is not present because the power supply for the metering chip is a non-isolated switcher, with a full-bridge rectified input. This results is system DGND (and thus AGND) being at a different potential to NEUTRAL.
Is there a simple way to reconfigure the attenuation network to give the appropriate input to the meter, yet overcome the inability to connect AGND to NEUTRAL?
Any help would be greatly appreciated.