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ADS42JB69: Sample Rate and ENOB / SNR Relationship

Charles Roberts
Prodigy 30 points
Part Number: ADS42JB69

I have a design that uses the ADS42JB69 ADC, it is sampled at 100 MSPS. We are evaluating the ENOB with a Fin of 10Mhz and 25Mhz. This is at the 2.5Vp input setting. We are calculating an ENOB higher than what is in the data sheet.

Is there SNR / ENOB data for the device at 100MSPS? Should we expect an improvement in those figures of merit based off the lower sample rate?

  • 0
    TI__Mastermind 30880 points

    Hi Charles,

    ENOB is related to SINAD (SNR + THD), not just SNR straight. 

    So the calculation should be SINAD = 6.02 * ENOB + 1.76 (dB), Solve for ENOB.

    If this still doesn't help, please share some of the numbers you are collecting and we can look into this for you.

    Regards,

    Rob