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ADC32RF52: SFDR frequency range

Kei Kuwahara
Expert 7600 points
Part Number: ADC32RF52

Hello team,

On the datasheet, it says – SFDR worst spur: 90 dBFS.

What is the frequency range for 90dBFS of SFDR?

I dont see any measured graph showing 90dBFS of SFDR. (It is only 58dBc)

Best Regards,
Kei Kuwahara

  • +1
    TI__Mastermind 23720 points

    Hi Kei,

    With proper frequency planning and decimation modes to push harmonics and other high level spurs out of band, SFDR of 90dBFs can be achieved. Typically, SFDR metric in the top of datasheet will refer to non-HD2-5 spurs.

    Thanks, Chase

  • 0 in reply to Chase W
    TI__Expert 7600 points

    Hi Chase-san,

    So, would it mean that ADC32RF52 can achieve 90dBFS of SFDR when fin = 900MHz at full analog input frequency range (2300MHz), if decimation or frequency planning is properly done?

    My customer wants to know this because some ADC says it has very good SFDR, but it limits in very narrow frequency range.

    Best Regards,
    Kei Kuwahara

  • +1 in reply to Kei Kuwahara
    TI__Mastermind 23720 points

    Hi Kei-san,

    Yes, if decimation and frequency planning is properly done then this should be achieved across the full device range. I can take a sweep measurement across input frequency if that would help the customer see any potential low spots. Can you provide me with customer's interested sampling rate and decimation factor? If in the next few hours, I could setup and run this measurement today. Due to US holidays I will be responding intermittently the remainder of this week.

    Regards, Chase

  • 0 in reply to Chase W
    TI__Expert 7600 points

    Hi Chase-san,

    Thank you for the quick answer!

    I will ask the customer if they want a measured result.

    However this is not urgent, so measurement after your holiday would be okay.

    Happy Holidays!!!

    Best Regards,
    Kei Kuwahara

  • 0 in reply to Kei Kuwahara
    TI__Mastermind 23720 points

    Thanks Kei-san, I will await your and the customer's response before taking any measurements.

    Regards, Chase

  • 0 in reply to Chase W
    TI__Expert 7600 points

    Hi Chase-san,

    Customer doesn't need actual measurement.

    They are impressed with the performance of this device!

    Best Regards,
    Kei Kuwahara