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Jiteer between two ADS7945

Kamal Najmi
Expert 3295 points
Other Parts Discussed in Thread: ADS7945

HI my customer would like to use two ADS7945 in parallel.

He would like to read both measurments at the same time and would like to know the jitter between both measurments.

could you please help?

regards

kamal

  • 0
    TI__Expert 3295 points

    HI,

    Any body can answer the following question?

    Regards

    Kamal

  • 0 in reply to Kamal Najmi
    TI__Expert 5705 points

    Hi Kamal,

    I apologize for the delay. Aperture jitter is not something that is characterized on this part. The datasheet only specifies a typical value of 10ps (RMS) based on simulation. If two ADCs are being used for simultaneous sampling then the RMS jitter between their measurements would just be ((10ps)^2 + (10ps)^2)^(1/2) ~= 14ps or +/-42ps worst case assuming a factor of 3 for a Gaussian distribution. Of course this is assuming the clock signals driving the sampling switches of the two ADCs are in-phase and precise (jitter << 10ps) so that their contribution is negligible.

    Best Regards,
    Harsha Munikoti