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TSW1400EVM: Inconsistency in data capture

Satheesh Bojja
Prodigy 80 points

Part Number: TSW1400EVM
Other Parts Discussed in Thread: ADS5294

Hi,

I am using TSW1400EVM to sample data with ADS5294. 

I have automated the data capture using MATLAB and I am having inconsistency with the captured data (as shown in attached pics)

Regards

Satheesh

  • 0
    Prodigy 80 points

    Adding more plots with the same issue. 

  • 0 in reply to Satheesh Bojja
    TI__Genius 12025 points

    Hi,

    Very sorry, we cannot see anything from your plots.

    Could you please forward to us again?

    Thank you very much!

    Best regards,

    Chen

  • 0 in reply to Chen Kung
    TI__Genius 12025 points

    Hi,

    Here are more information you can take a look:

    for your support of using  Matlab, here are DLL files you can use:

    also please refer to: \Texas Instruments\High Speed Data Converter Pro\HSDCPro Automation DLL

    Automation DLL Matlab Example

    ================

    An easier to use "Automation DLL" has been created which can be used to communicate with the HSDC Pro boards(TSW1400, TSW1405 and TSW1406) using the High Speed Data Converter Pro GUI.

    Some of the benefits of using the Automation DLL are,

    1. Supports both ADC and DAC devices. Supports both new and old ADC Firmwares.
    2. Ability to obtain Post Processing results as well as the raw time domain data for ADC.
    3. Ease of use. Using this Automation DLL, almost all the user operations on the GUI can be remotely done using the Automation DLL from another application.
    4. Advantage of using the same DLL functions without any modifications for all boards(TSW1400,TSW1405,TSW1406).

    Please find the Automation DLL(32bit and 64bit) with LabVIEW, C and Matlab examples at,
    \Texas Instruments\High Speed Data Converter Pro\HSDCPro Automation DLL

    ===============

  • 0 in reply to Chen Kung
    Prodigy 80 points

    Hi Chen,

    I am using the correct DLL file with LabView. 

    Everything seems to be working fine. However, every 1 out of 15 or 20 data captures are inconsistent. 

    Regards

    Satheesh

  • 0 in reply to Satheesh Bojja
    TI__Genius 12025 points

    Thanks!

    Yes, we will forward your question to TSW group.

    Thank you again!

    Have a nice day!

    Best regards,

    Chen

  • 0 in reply to Chen Kung
    TI__Mastermind 18095 points

    Satheesh:

    We could not see any of the original screen captures.  Can you provide some additional details.  Do you think the issue is the ADC or the TSW1400 or the capture program? 

    When you say 1 out of ~15 captures is inconsistent, do you mean that you get bogus information or weird FFT?  I wonder if the memory capture depth of the TSW1400 is getting over-run and then ever so often it over-fills and gives a bad capture.  Try reducing the capture depth by Data Capture Options > Capture Options > 16384.  Then change the analysis window (samples) to the same value in the pull down selection.

    --RJH

  • 0 in reply to RJ Hopper
    Prodigy 80 points

    Hi Hopper,

    I am attaching a word document with the screenshots of the captured data. 

    The same document can be found in http://web.eng.fiu.edu/sbojjave/TI/

    I do not know if the issue is with ADC or TSW1400. 

    When we execute the MATLAB script, ADC and TSW work perfectly well detecting only the desired fundamental component at 10 MHz, with uniform noise floor. Intermittently, as can be seen from the screenshots, along with the fundamental component, other spurs and noise rise up at random spots. This behavior is completely random and exists even when we change the test signal IF BW to 5 or 15 MHz. 

    Regards

    SatheeshTSW1400EVM_DataCapture.docx

  • 0 in reply to Satheesh Bojja
    TI__Guru* 91947 points

    Satheesh,

    Make sure the 5V source to the TSW1400EVM can provide at least 4A of current. If this is the case, I suggest sending this post to the data converter medical forum as they support this ADC EVM (our group does not).

    Regards,

    Jim

      

  • 0 in reply to jim s
    Prodigy 80 points

    Thank you.

    Let me try to increase the current.

    If the issue still persists, I will post this in the suggested forum. 

  • 0 in reply to jim s
    Prodigy 80 points

    Hi Jim,

    Increasing the current fixed the issue. Thank you.

    Regards

    Satheesh