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ADE7758. Neutral and gnd conections

Hi, I'm designing an energy metter with the ADE7758 and I've got some questions about the neutral and the gnd conections of the power supply. I've done a first schematic and I'm not sure if the conections are ok. I'm using a switched power supply. Anyone could help me or give me some advice?

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  • Thanks for answering FormerMember.

    In a second revision of the desing I've done the decoupling to the Ref pin, added the separate caps to AVDD and DVDD and I've tied together the GND of the power supply and the neutral with the RC filter. I've also used the ADuM262N instead of the optos because they are too slow for the SPI conections. But I've not made any changes on the burden resistors, it could be a problem?

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  • Thanks for answering FormerMember.

    In a second revision of the desing I've done the decoupling to the Ref pin, added the separate caps to AVDD and DVDD and I've tied together the GND of the power supply and the neutral with the RC filter. I've also used the ADuM262N instead of the optos because they are too slow for the SPI conections. But I've not made any changes on the burden resistors, it could be a problem?

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