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ADS1298 bypassing J1

Adam Freed
Prodigy 215 points

Other Parts Discussed in Thread: ADS1298, ADS1298ECGFE-PDK

I'm also using the ADS2198FE board in this manner (bypassing the J1 connector and sending signals directly to JP30-37 for EMG). I have been successful in generating square waves using the internal signals following the flow diagram on page 70 of the ADS1298 user document, but when I apply an external square wave from a signal generator, the output signal is very noisy. It also seems to have an offset for some reason, as it does not pass through zero (it is either a very large degree above zero or a large degree below zero, both for the positive and negative portions of the wave depending on the signal strength I input). How should I be interpreting the values of the output and is using the RLDOUT for the ground of my signal generator applicable here? Thanks, Adam

  • 0
    TI__Expert 3260 points

    **TI EDIT February 20th 2019; FOR GENERAL ADS129x ASSISTANCE, PLEASE SEE NEW BIOPOTENTIAL FAQ LOCATED HERE**

    Hello Adam, Can you capture the data using the "Save" tab? Also, try applying your signal directly to pins 2/4 of the input jumpers JP-30/37, like the one below:

  • 0 in reply to Michael W
    Prodigy 215 points

    Hi Michael,

    I am not using the software associated with the ADS1298FE, but I have included some data files for you to inspect.  The channel 1 output data (wvch1.txt) from the internally generated signals as described on p.70 of the manual and its associated plot is shown.  The data has not been converted from 2's complement.  I have also included a set of data from the external signal generator (sqwv.txt) and its associated plot. 

    The leads for the signal generator are soldered to the underside of the board at pins 2 and 4 of JP30 as you described.  My oscilloscope shows the signals to be stable and without noise at entry point on the board, although they are distorted when I probe the jumper pins on the upper side of the board.  I currently have the jumpers in place on the 3-4 pins of JP30-JP37, as well as on JP20, however, removing them does not seem to change the results.  I am also setting all registers to default values, except for CONFIG3, where I am setting it to use the internal reference.

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    Fullscreen 6505.sqwv.txt Download 
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    Please let me know if you require any more information.

    Regards,

    Adam

  • 0 in reply to Adam Freed
    TI__Guru**** 183371 points

    Hi Adam,

    By page 70 of the manual, are you referring to the data sheet for the ADS1298 revision 'F'?  The data from your 3113_wvch1 does seem to have a little more offset than what I am used to seeing but the magnitude seems reasonable.  What hardware are you using to capture this data?  How do you have the registers of the ADS1298 configured?

    Your input square wave has some strange DC levels/offsets.  When the entire txt file is plotted out, I see something like this:

     

    Can you possibly grab a ground referenced oscilliscope shot of the signal you are trying to apply to the ADS1298 inputs?

  • 0 in reply to Tom Hendrick
    Prodigy 215 points

    Hi,

    Sorry for taking so long to reply, but I didn't get any email notifications that you had made this last post.  Anyhow, I have taken a step back and acquired a new ADS1298FE setup. I removed the jumpers on JP30, then applied my signal (a square wave, input.bmp).  I have attached the save files from the ADS1298FE software. At this stage, I would like to see the proper output with the ADS1298FE and MMB0 for both my signal generator and then actual EMG before I go back to my original system design.

    To answer your questions, yes, I was referring to ADS1298 revision 'F'.  In my main system design, I am using a PIC24F mcu on am Explorer 16 board, saving the data to a SD memory card.  The registers were all set to default values, except I had internal reference powered on (config3).

    Not sure why you have half the data dropped down on your plot, I don't remember seeing that.

    Thanks,

    Adam

    6201.Device_0_Analysis.xls

    5488.Device_0_Codes.xls

    4152.Device_0_Volts.xls

  • 0 in reply to Adam Freed
    Prodigy 215 points

    FYI, the signal generator does not generate differential signals.  I have a signal and a ground from a coax output.

  • 0 in reply to Adam Freed
    TI__Guru**** 183371 points

    Hi Adam,

    I've been going over you recent and previous posts again and I really don't see where the problem might be.  Your scope shot (input.bmp) implies that you've got a +/-7V square wave at 500Hz applied to the input.  I'm going to assume there's something off about the 500.0us/ being the time scale and that perhaps you have the probe attenuation incorrectly set.  I've set up my board(s) the same way you have, here is my register setting tab:

     

    After plotting your Device_0_Volts.xls file, I figured you were inputting something on the order of a 1Hz square wave.  I see 2 cycles at 500SPS over 1000 samples, so here is your data plotted:

    I also put in a 1Hz square and sine wave, directly to pins 2 and 4 of JP37 (with no other jumpers loaded) from my signal generator (a Stanford Research DS345) and got the following results:

    So - where do we go from here to get to the bottom of this issue?  I think the easiest thing to do is to try and arrange a quick call to discuss exactly how you are applying your input signal as well as how you have the voltage rails configured on the ADS1298ECGFE-PDK board.  I'll have a quick chat with the administrators of this forum and get in touch with you directly.

     

    adam_Volts.xls
  • 0
    Prodigy 70 points

    Hey Adam,

    I was hoping you could help me out with the step by step process you took when using the ADS1298ECGFE-PDK for EMG use. I know it has been a while, but let me know if you can help me out.

    Thanks,

    Eleni