The clock inputs (CLK+,CLK-) for differential mode states that the Differential Clock Input Voltage is 0.4 to 2.0Vp-p (when the supply VAVDD = 1.8V). Is this the absolute value (VID) of the voltage potential between CLK+ and CLK- or is it the full amplitude swing of the differential signal (i.e. 2xVID) ?
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Answer:
The Specification for a Differential clock is 2Vpp MAX. What this means is that the CLK+ signal will have a 1Vpp swing and CLK- will have a 1Vpp swing that is 180 degrees out of phase. As shown here…
The labels are wrong, but the waveforms are correct. Vpp is the SUM of difference between the two states (high and low) of the two signals. In this mode, a 2Vpp signal will swing from 0.7V to 1.7V on each CLK pin (+/-), which is well within the ABS MAX rating for these pins.
It is recommended to AC couple this signal.