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AFE5812EVM: Different GND

Part Number: AFE5812EVM

Hello TI people,

I have a question about the different ground in AFE5809/AFE5812 EVM. 

It has three ground GND(Power GND), AGND and DGND(USB). 

Now, From the schematic, I can see that Analog Ground is the Power ground. So would that be ok that if I connect AGND pins of an AFE5809/AFE5812 chip to normal ground and just keep two isolated ground on board, that will be GND and DGND. 

Thank you.

3 Replies

  • Hi Vatsal,

    That is a system decision. Separating grounds is usually done to prevent noise coupling across analog, digital, domains. Where on the AFE5809EVM do you see a Power ground?

    Sincerely,
    Olu
  • In reply to Olu Sodipe:

    Hi Olu,

    That is true, it is mainly to prevent noise between analog and digital part. 

    On AFE5809EVM AnalogGND = Power GND so there is only two GND that I can see. Is it on purpose that EVM doesn't have it Analog GND separated? Because if we look in to AFE5809 datasheet there are pins for Analog GND. 

    Thanks.

  • In reply to Naik:

    Hi Vatsal,

    We generally recommend separating analog and digital grounds for our AFE devices. The schematics probably just need updating.

    Sincerely,
    Olu

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