The datasheet specifies an aperture delay of 0.1ns. For ADCs at 250Msps, this sounds too good to be true.
This is more than a subjective "too-good-to-be-true" perception on my side. Looking at other ADCs in the same category (Standard High-Speed ADCs), I see:
For similar speeds:
- AD9683, AD9250, AD9634, AD9642 (all up to 250Msps) — aperture time is 1ns
- AD9434 (370Msps, 500Msps) — aperture time is 0.85ns
Even some of the faster ones:
- AD9684, 500Msps — aperture delay close to 0.5ns
- AD9695, at 1.3Gsps — aperture delay is close to 0.2ns (at 625Msps, 0.16ns)
Even the AD9213, at 6Gsps or 10.25Gsps, specifies a 0.12ns aperture delay!!
Can you provide confirmation? What is the aperture delay and aperture jitter for the AD9626?