Hi Peter!,
Thanks for your reply.
We are not using the ADC at 5GSps yet, but in 4 channel mode at 1.25 Gsps each.
By SYNCHRONIZED I mean that if I send the same sinusoidal signal to the 4 channels at the same time I would expect that the resulting samples for each channel overlap (or maintain a minimum delay smaller than 1 sample period). A pulse in the SYNC input on the ADC chip should do it.
As you see in the figure 3 attached, this is not the case, the samples maintain a relative latency of some samples (not just a delay smaller than a sample period); this latency is not deterministic, every time I program the FMC125 we got different values, sometimes 2, 3 or even the 4 sampled channels coincide and sometimes not. I have used both, the SYNC from CPLD as in your C reference design and a external pulse. Have you observed this before?
In the same figure you can also see the samples in TEST mode "ramp" after a SYNC pulse, only 2 of them are aligned. (The TEST mode "flash" is not relevant as e2v told me that they have an issue with it)
The question is then, does the calibration package guarantee that, in this scenario (4 channel mode @1.25Gsps each), the samples of each channel will be aligned i.e. synchronized?
If so, do you (or we) have to send this SYNC pulse as explained in e2v App. Note 1083B (fig. 4.)?
Thanks, I am already in contact with the sales team.
Daniel