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I am designing layout for delfino TMS320F2837xS ,and i am using the REF3030 LDO for ADC VREF,
i have both DGND and AGND, my question is about the REF3030 GND connections :
- should i connect ref3030 ground to the AGND ?
- which ground should i connect to the ref3030 input capacitor?
thank you very much for your help
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In reply to Gautam Iyer:
C2000 TI Wiki PagesTI Forum Sitemap
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In reply to Devin Cottier:
thank you very much for the detailed reply , i have attached a schematic part of a board (i have based my design on the LAUNCHXL-F28377S) that we have already designed and manufactured , but if the current layout needs improvement i will do a second revision.
i whould be happy if you can give some feedback , from your answer i understand that i needed to power the ref3030 also from VDDA and
not from the 3.3V as i did , and then the ref3030 input capacitor will be referenced to AGND ? am i right?
In reply to MARK PESACH:
first of all thank you very much for your great help!
one last question if i may:
i am thinking about adding another capacitor after the inductor that will be referenced to digital ground (see option 2) so if any noise will still pass, the returning path will be with the digital ground plane and not move through AGND.
is there any sense of doing it ?
I think you want option I. This will prevent noise from bypassing the inductor via the ground plane.
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