> On Dec 3, 2015, at 3:03 PM, Chelsea Orefice <coref...@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? You can calculate this from the info provided in the datasheet on page 24 and 25. The error occurs because of the sample and hold which uses a 9pF capacitor. Use T=RC to calculate the time constant. R is the impedance of you input circuit. Given the sampling time, you can calculate the measurement error.
> 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: > No image visible. You have to provide a link to an image. Regards, John > > 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+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > 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. For more options, visit https://groups.google.com/d/optout.
