General > General Technical Chat
"Grounding" according to Analog Devices
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Infraviolet:
If you're still having a cookie popup problem, try NoScript or another script blocker, page loads fine for me using those, no pop-ups in the way anywhere.
SiliconWizard:

--- Quote from: Bud on February 17, 2023, 04:22:49 am ---10 years ago when I was speaking to an AD Lab engineer he said they use solid ground plane for characterization of their ICs and design of evaluation boards.

--- End quote ---

Not surprised. Anyone sane does that. You don't cut your planes with slits or worse (in most cases), separate ground planes and connect them in a single point.
That's a case of: do what I do, not what I say.
EPAIII:
They do it because the people who write code are tyrants. Their way or the highway! Period. Ever try to get one to do a simple project? No way Jose! Gotta have all the latest bells and whistles when all you want it to do is ring a doorbell.

Been there! They won! Overnight project took 1.5 years.




--- Quote from: BrianHG on February 17, 2023, 03:30:43 am ---
--- Quote from: SiliconWizard on February 17, 2023, 02:19:03 am ---https://www.analog.com/en/analog-dialogue/articles/staying-well-grounded.html

--- End quote ---
Cant get past the stupid cookie consent.  Why do they do this....

--- End quote ---
wraper:
Ground splitting is a sure way how to fail EMI tests and have random operation failures. In some cases causing IC latch-up, personally seen that in a commercial device that brand new cost like $100k. Replacing ADC or even swapping the whole board did not fix the issue of ADC latching up and heating like hell like 1-3 times in a year (sat on both analog and digital GND connected in other place on PCB). The only fix that worked was connecting grounds under this IC. It more or less worked in the past when digital part was slow. But now with very fast digital signals making slits in GND is intentionally making good antennas. I'm not saying is should never be done, however it only makes things worse in 99% of cases. Digital/analog ground splitting is not the worst though. The most popular thing seems to be splitting GND at USB shield. Many app notes suggest that too. The funny thing is that some suggest adding a cap in series, others a ferrite bead, making them do exactly opposite thing  :palm:. And some even add a cap in parallel with inductor making a nice LC circuit. Just look on this abomination from Arduino UNO. A nice way how to divert ESD from USB shield into data lines through devices which are supposed to protect from it.
JohanH:
"How to Achieve Proper Grounding" - Rick Hartley

Definitely recommended to watch this training. This is an expert with 50 years of experience of signal integrity and EMI and he assists companies in these matters.


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