ADS8382: Impedance b/w AGND and DGND

Ryuuichi machida

Part Number: ADS8382

Tool/software:

Hello,

Customer asked following information.

* Impedance b/w AGND and BDGND

Is it possible to disclose above information ?

Best Regards,

5 months ago

0 Samiha Sharif 5 months ago

TI__Genius 9026 points

Hi Machida-san,

Thanks for your question. What project/application is this regarding?

I do not have the impedance information readily available. You can refer to this FAQ regarding grounding recommendations: https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/755516/faq-pcb-layout-guidelines-and-grounding-recommendations-for-high-resolution-adcs

Best regards,

Samiha

0 Ryuuichi machida 5 months ago in reply to Samiha Sharif

Guru 12715 points

Hello Samiha-san,

Thank you for your reply.
Our application is kind of tester.

>I do not have the impedance information readily available. You can refer to this FAQ regarding grounding
The background of this question is below. So, our purpose is not to confirm guideline.

* Customer found there is/are ADS8382 on custom board which have different impedance from other their custom board between AGND and BDGND.
So, if you can disclose the spec, we would like to confirm this difference is within the spec and whether we have no problem.

Could you please also give your comment whether we can see difference of impedance b/w AGND and BDGND depending on device individually or lot of device ?

Best Regards,

+1 Samiha Sharif 4 months ago in reply to Ryuuichi machida

TI__Genius 9026 points

Hi Machida-san,

Thanks for sharing. Talking to the team, there is likely no intentional path between AGND and DGND, so it is difficult to measure. There may be some unintentional parasitic path through which AGND and DGND is connected inside the device, but there is no spec for this and as it could be unintentional, there may be variations between devices. We recommend customers connect the two GNDs on their PCB so they are referenced to the the same ground close to the device.

Best regards,

Samiha

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ADS8382: Impedance b/w AGND and DGND