Jiteer between two ADS7945

Expert 3195 points

Kamal Najmi

Replies: 2

Views: 305

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

• ADS7945

Expert 3195 points

Kamal Najmi

• Dec 16, 2013 10:18 AM
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2 Replies

• Expert 3195 points

  

  Kamal Najmi

  

  • Feb 17, 2014 10:10 AM

  HI,

  Any body can answer the following question?

  Regards

  Kamal

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• Expert 5705 points

  

  Harsha Munikoti

  

  • Feb 19, 2014 10:03 PM

  In reply to Kamal Najmi:

  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

  ---

  Harsha Munikoti

  Product Applications, TI Current & Magnetic Sensing Products

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