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ADC12DJ3200EVM: Capture Only Desired Channel

Anthony Rogers
Intellectual 340 points
Part Number: ADC12DJ3200EVM
Other Parts Discussed in Thread: TSW14J57EVM

Hello,

Is there a way to capture only a specific data channel? The reason I ask this is because I would like to capture a longer stream of data off of a single channel. Ideally, I'd like to use something like JMODE 15 or JMODE 16, and capture only the real parts of a single, complex stream. I'm aware that I can post-process the data to remove the channels I don't want, but if I can capture only a certain stream, then I'll have more continuous data.

Thanks,

Anthony

  • 0
    TI__Mastermind 20541 points

    Hi Anthony,

    Here the ini file which will only let to capture complex stream of CHA of the ADC in JMODE16.

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/73/ADC12DJxx00_5F00_JMODE16_2D00_cha.ini

    Please copy the file to following location on your PC. C:\Program Files (x86)\Texas Instruments\High Speed Data Converter Pro\14J57revE Details\ADC files

    Disconnect and then reconnect the TSW14J57EVM the ini file will show in drop down selection menu and you can use it capture. Please note JMODE16 is complex you will need both the real and imaginary stream of data to get the full info out of it.

    Regards,

    Neeraj 

  • 0 in reply to Neeraj Gill
    Intellectual 340 points

    Hi Neeraj,

    Thank you, that works great for channel A. That's a great way to get a longer recording out of the system.

    Looking at what you changed, it appears you loaded a different firmware, and also de-selected the lanes and devices you were decoding from, so I'll keep that in mind to make future custom .ini files.

    My approach to not require the imaginary portion of the complex waveform is to use the NCO to move the waveform to a little above baseband such that one stream will contain the needed data. That way, I could capture only the real stream and save even more storage so I can record longer. Looking through the data sheet, I suspect this may not be possible since the I and Q share the same JESD204B lane. Is this true, or is there a way to record only the I's and not the Q's for JMODE 16?

    Thanks,

    Anthony

  • 0 in reply to Anthony Rogers
    TI__Mastermind 20541 points

    Hi Anthony,

    You will have do that in post processing. There not a very straight forward method to get the samples just from the real channel. because both the real and imaginary samples are sent on the same channel. 

    Regards,

    Neeraj

  • 0 in reply to Neeraj Gill
    Intellectual 340 points

    Understood! Thanks Neeraj.