> On Feb 22, 2017, at 10:14 PM, Heinz Hummel <heinz.humme...@gmail.com> wrote: > > Hello, > > at > https://books.google.de/books?id=Udu6BQAAQBAJ&pg=PA344&lpg=PA344&dq=beaglebone+adc+op+amp&source=bl&ots=CZagSBqMui&sig=cLXCgstuc51TzoBRzMzB81RcJyU&hl=de&sa=X&ved=0ahUKEwjZ6-LovKTSAhXJXBQKHfktBio4ChDoAQhJMAk#v=onepage&q=beaglebone%20adc%20op%20amp&f=false > a wiring scheme for the analog inputs is described which protects the > BBB/BBG from overvoltage. > > Amazingly they connect AGND and GND with each other. Is this really a good > idea? Well, at some point they are always connected. What you want is for them to connect only at one point and that point should be closest to the power source. Think of a star connection, with the center of the star as the reference ground point. What you don’t what is digital signals flowing through the analog ground and that occurs when you connect AGND to DGND at more than one point.
Regards, John > > Thanks! > > > > -- > For more options, visit http://beagleboard.org/discuss > <http://beagleboard.org/discuss> > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/6be28d4e-04a5-4de0-b47b-173d2a025764%40googlegroups.com > > <https://groups.google.com/d/msgid/beagleboard/6be28d4e-04a5-4de0-b47b-173d2a025764%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CC2B0B97-982D-48D4-97DD-398FDFB635F4%40gmail.com. For more options, visit https://groups.google.com/d/optout.
