Hi Chelsea, Here are some reference I have found helpful:
http://www.analog.com/library/analogdialogue/archives/39-05/op_amp_applications_handbook.html <http://www.analog.com/library/analogdialogue/archives/39-05/op_amp_applications_handbook.html> http://www.analog.com/library/analogDialogue/archives/39-06/data_conversion_handbook.html <http://www.analog.com/library/analogDialogue/archives/39-06/data_conversion_handbook.html> Regards, John > On Dec 3, 2015, at 5:57 PM, Chelsea Orefice <coref...@smith.edu> wrote: > > Hi John, > > Just wanted to say thank you for really helping me with this. It has been a > struggle for me and my team to get help from different resources at school as > well as our liaisons where we are getting our design requirements from. (This > is our senior engineering project.) > > I am having still a little difficulty in understanding how the circuitry I > shared with you may give me a single input instead of differential that the > ADC requires.I attached the actual design of the system, so if you could help > me understand how it won't work it'd be much appreciated. > > Also, may you tell me your background in relation to all of this? You are > very knowledgeable in this area, and when I relay some of this information to > my team I would like to share from whom I received this information from. > > > Sincerely, > Chelsea > > On Thu, Dec 3, 2015 at 7:01 PM, John Syne <john3...@gmail.com > <mailto:john3...@gmail.com>> wrote: > Hi Chelsea, > > I have cc beagleboard because someone else might learn from this discussion. > Looking at the link you provided, it won’t work because ADS1278 requires a > differential input. Look at page 39 for circuits that will work for you. > > Regards, > John > > > > >> On Dec 3, 2015, at 3:52 PM, Chelsea Orefice <coref...@smith.edu >> <mailto:coref...@smith.edu>> wrote: >> >> My apologies. Please let me know if this link works. (You will need to just >> copy and paste in search bar). If that doesn't work I will send it as an >> attachment. Will also look at the diagram as well. >> >> http://cnx.org/resou >> <http://cnx.org/resou>rces/72628d36f0c24bc80ff94e5c0bf6df2b27a86751/opamp4.png >> >> Thanks again, >> Chelsea >> >> On Thursday, December 3, 2015 at 6:46:49 PM UTC-5, john3909 wrote: >> Look at page 39 for a suitable input circuit. >> >> Regards, >> John >> >> >> >> >>> On Dec 3, 2015, at 3:03 PM, Chelsea Orefice <core...@smith.edu <>> wrote: >>> >>> Hi John, >>> >>> Thanks for getting back to me. I was actually looking at that same ADC >>> converter as you posted in your reply. Just looking for some clarification >>> on a few things. What type of error would a simple resistor divider >>> introduce into the system? I am currently using a cascaded inverting op amp >>> system. Not really sure if this will scale the input voltage to a level >>> that is compatible with my ADC. >>> >>> The circuit diagram looks like this: >>> >>> >>> Looking forward to your reply, >>> Chels >>> >>> On Thursday, December 3, 2015 at 5:07:41 PM UTC-5, Chelsea Orefice wrote: >>> Hi everyone, >>> >>> I am new to the world of using MCUs and am looking for some assistance on a >>> project that I am currently working on. To sum things up quickly, I am >>> building a data aggregation unit that can convert analog voltage readings >>> to digital values that is to be stored on a USB or SD card. The DAU will >>> collect 3 types of signals, a buffer signal, clipped signal, and a signal >>> passed through a LPF. In the end, the data should be stored as either a >>> MatLab file or .xml file. However, I am facing a few road blocks relating >>> to my design. >>> >>> 1.) I need to use a 24 bit ADC for high resolution purposes based on design >>> requirements that were just given to me as I will be collecting data from >>> .1mV to 50V and it has to have a high sample speed rate. Has anyone >>> connected an external ADC to the BBB? If so, what was the brand of your >>> external ADC? How did you connect the ADC to the BBB? (It'd be greatly >>> appreciated to be able to see a design). >>> >>> 2.) If you have had a similar project to this, was wondering how you went >>> about it. Any advice would be greatly appreciated. >>> >>> >>> As I said before, all of this is very new to me. So thank you for taking >>> the time to help me out. >>> >>> Chelsea >>> >>> >>> >>> -- >>> 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...@googlegroups.com <>. >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >> > > > <buffer system.PNG> -- 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. For more options, visit https://groups.google.com/d/optout.
