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SNR and SFDR data for ADC12DJ5200-SP

Phillip Feldman
Prodigy 10 points

I’m hoping to get whatever SNR and SFDR data is available for this chip.  We currently have no data above 8 GHz.  We are only interested in loading levels close to Pclip.  We need SFDR for a spur search within a wide BW (many GHz) of the input tone.  It would also be helpful to have information re. how the spurs fall off with frequency separation from the input tone.

  • 0
    TI__Mastermind 45670 points

    Hi Phillip,

    Just so we are clear, you are requesting SNR/SFDR performance above 8GHz? If so what range are you asking from/to and we can measure this for you?

    Also, please define what is meant by "pclip". Near fullscale of the ADC's input level?

    Regards,

    Rob

  • 0 in reply to Rob Reeder
    TI__Prodigy 210 points

    Hello Rob,

    Phillip Feldman is having issues responding on E2E. I have added his new request below.

    I did some further thinking and realized that we don't need any data beyond what we already have.  But, I do have a question about the following SFDR numbers that presumably came from TI:

    400 MHz: 65 dBFS

    1 GHz: 64 dBFS

    2.4 GHz: 65 dBFS

    4.2 GHz: 59 dBFS

    6 GHz: 54 dBFS

    8 GHz: 50 dBFS

    A sampling rate of 10.4 Gsps corresponds to a Nyquist frequency of 5.2 GHz.  So, what do the SFDR numbers mean at frequencies above Nyquist?

  • 0 in reply to Joe Luck
    TI__Mastermind 20541 points

    Hi Joe,

    When the analog input frequency is in 2nd or higher Nyquist zone. The analog signal will alias to first Nyquist zone. For example 6GHz signal will alias down to 6GHz - 5.2GHz =  800MHz. 

    You can watch this video to further understand how the analog signal alias down depending on the Nyquist zone. 

    Bandwidth vs. Frequency - Subsampling Concepts - YouTube

    Regards,

    Neeraj