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CLK to FCO Timing

Category: Datasheet/Specs
Product Number: AD9257

Hello,

Datasheet specifies a 1.5-3.1ns propagation delay between the input CLK and FCO. Table 4; Output parameter FCO Propagation delay (t_FCO)

In the oscilloscope capture below there are three traces defined as follows:

  • CH1 : DCO+ : Yellow
  • CH2 : CLK+  : Blue 
  • CH3 : FCO+ : Purple

As you can see the measured propagation delay is 12ns.

And ideas on the discrepancy?

Thanks,
Joseph