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How can I make a High Speed ADC with F28M35H52C1

Mandy Foster
Prodigy 230 points
Other Parts Discussed in Thread: CONTROLSUITE

My project is to sample a analog signal with 5MHz for an ultrasound application.

I need to transfer the data to Matlab so that I can analyse and study the signal.

I have the kit Concerto F28M35H52C1 with controlCARD. I am struggling to use the ADC example code from ControlSUITE to digitalize the 5Mhz signal. 

Any tutorials, explanations, suggestions are appreciated.

Thank you.

Mandy

  • 0
    TI__Expert 7885 points

    Mandy,

    If you are trying to sample a 5MHz signal, the F28M35 will not be able to do this.  The max sampling rate with this chip is around 5MHz.

    To accurately sample a 5MHz signal, you will need to sample at a rate of at least twice the signal frequency (>10MHz) per Nyquist-Shannon sampling theorem.

    For this I would recommend the F28335 which can sample at 12.5 MS/s.

    Regards,

    Adam

  • 0 in reply to Adam Dunhoft
    Prodigy 230 points

    How can I achieve the ADC maximum sampling rate using F28M35x and Code Composer Studio? 

    It is the ping-pong ADC the only way to achieve maximum ADC sampling rate?

    How can I make the ping-pong ADC working? I use the code in the ADC SOC example from ControlSUITE. But it get stuck in one of the while loops waiting for one ADC's to trigger the other. How can I fix that? 

    Can you send me a usage example?

    Thank you

    Mandy

  • 0 in reply to Mandy Foster
    TI__Expert 7885 points

    Hi Mandy,

    Sorry for the delayed response, but I saw that you were working with Trey in a different thread about this issue.  Were you able to get everything resolved or do you still need assistance with this?

    Regards,

    Adam