We all konw that LVPECL common mode voltage is 2V. But according to this picture,the common mode voltage is 1.3V .This come from TI's document,,i could not believe the voltage is 1.3V .Thanks anyone who can help me solve this problem.
This might just be a case of a typographical error. LVPECL is normally terminated to (VCC-2V) which would be the case based on the diagram. A 3.3V VCC will have a potential of 1.3V at the 83ohm resistor which is 2V lower than VCC. The common mode voltage should have been stated as 1.3V instead of 2V for a 3.3V VCC.
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