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Isolating digital noise from micro controller based clocking

 
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MacroMachines



Joined: 12 Dec 2014
Posts: 70
Location: Detroit,MI

PostPosted: Mon Feb 13, 2017 10:39 pm    Post subject: Isolating digital noise from micro controller based clocking Reply with quote

We have a design making use of a micro controller for the FV-1 clock input, and have encountered some digital noise artifacts. I am wondering if there are any good resources as to the best method for addressing this. I have been reading a bit on digital / analog ground splitting which seems relevant, and mainly was curious if there was potentially something more specific showing an FV-1 based design schematic / pcb that makes use of a micro controller or other non-chrystal clocking techniques.
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Digital Larry



Joined: 12 Nov 2012
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PostPosted: Tue Feb 14, 2017 11:50 am    Post subject: Reply with quote

Look at the Fixed Program module here: http://www.spinsemi.com/mixer_application.html

Though I have no experience with it to know whether it effectively suppresses uController noise.
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frank



Joined: 19 Oct 2005
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PostPosted: Tue Feb 14, 2017 1:38 pm    Post subject: Reply with quote

Good ground is very important. You can get away with a single ground plane but you must watch for ground loop and path issues. Any trace should have solid ground below it, do not run a trace over a break in the ground plane. Keep traces short and straight as possible, if you have traces on 2 layers of a board make sure they cross each other and not follow right over each other.
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MacroMachines



Joined: 12 Dec 2014
Posts: 70
Location: Detroit,MI

PostPosted: Sun Feb 19, 2017 9:08 am    Post subject: Reply with quote

frank wrote:
Good ground is very important. You can get away with a single ground plane but you must watch for ground loop and path issues. Any trace should have solid ground below it, do not run a trace over a break in the ground plane. Keep traces short and straight as possible, if you have traces on 2 layers of a board make sure they cross each other and not follow right over each other.


EDIT: realized you meant parallel vs perpendicular, assuming so the signals aren't near each other for long traces along the opposite sides of the board. Is this like an induction/Magnetic interference thing? I truthfully could use some substantial pcb design insight.

Are there good books or tutorials etc you might recomend?

Original:
I'M not sure if I understrand. W머 ㅗㅕㅏ몀ㅑㅣㅣㅣㅣㅣㅏㅏㅒㅖㅐㅛㅐㅆㄳㄲㅆㄲㄷㄱㅆㄲㄷㅈㄷㄱㄷㄱㅂㅈㅛㅛㅐㅖㅣㅣㅣㅣㅣㅣㅏㅓㅗㅓㅏㅓㅑㅓㅏㅓㅏㅗㅒㅗ쏫ㄷㅆㄱㄷㄱㄷㅅㄷㅆㅂ뱨뱨뱨ㅃ도도도도도ㅇㄹㅇㄹㅇㄹㅇㄹㅇㄹㅇㄹㅇㄹㅇㄹㅇㄹㅇㄹㅇㄹㅇㅀㅎㅎ여ㅏㅓㅏㅣㅣㅎ
What do you mean by "make sure they cross and not follow right over each other"?To me those sound like the same thing, signals on separate traces that are near each other? MDoes it help substantially to have maybe a 4 layer board with ground plane in the middle?
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frank



Joined: 19 Oct 2005
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PostPosted: Sun Feb 19, 2017 10:11 am    Post subject: Reply with quote

Read these two:

www.ti.com/lit/an/szza009/szza009.pdf
www.ti.com/lit/an/scaa082/scaa082.pdf
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