ONET1191P Vod?

John,

You are correct, with the VAR pin left open, the differential output voltage will be between 600mVpp and 900mVpp over voltage and temperature with the input voltage greater than 20mVpp differential.

Regards,

Alex.

Hi Alex,

  Thanks, to be clear then if Vod is the absolute value of the differential voltage between Dout+ & Dout- this results in a differential swing of +/-600mV min to +/-900mV max and a single ended swing of 600mVpp min to 900mVpp max (same as the absolute value of Differential Voltage: Vod) is this interpretation correct, or is the single ended swing 300mVpp min to 450mVpp max?  This is a common point of confusion with differential signaling and can mean a 2X difference in actual launched signal level versus what was expected.   This ambiguity in the absence of a simulation model and evaluation board make it very important that we eliminate this ambiguity to the extent possible.

Thanks again,

-John

Hi Alex,

  Thanks for your support on this issue.   I'm wondering if you could help me reconcile the eye diagrams in figures 14 & 16 of the ONET1191P data sheet with a single-ended swing of 300mVpp to 450mVpp?   Normally I'm used to seeing differential pair eye diagrams that show each leg of the pair (in this case Dout+ & Dout-) superimposed on each other.   But if that were the case for these eye diagrams each leg would be swinging (i.e. the single-ended swing) ~700mV.  What might explain this is if the eye-diagrams were created using a differential probe or by performing the subtraction of two scope channels, while unconventional it might explain things, do you know if this is the case?    Also, the ONET1191V is under design consideration so we've got the same question for the eye diagrams of that part shown in figures 14-16 of it's data sheet, so if you could address both the eye diagrams shown in the ONET1191P and ONET1191V data sheets that would be greatly appreciated.

Thanks for the support,

-John

Hi Alex,

   Thanks for making this clear.

-John