I want to syncronize two AD9914. But when I look at the SYNC_CLK signal with my scope, this two clock signals look strange.
In the Datasheet it is not clear if sync_clk should be lvcmos33 standard??
The osci measures only 2.16V (Evalboard#1) or 1.58V (Evalboard#2).
The Duty Cycle is also different (30% vs. 36%).
If I enable Impedance 50Ohm in the osci, the signal levels are: 568mV (Evalboard#1) and 616mV (Evalboard#2).
Surprisingly, both duty cycle are now ~25%!!
Is this the expected behavior? In the Datasheet the Value for the Duty Cycle is 45-55%