Can I use AD9558 or AD9558 with gapped clock for asynchronous demapping SDH from OTN?
Can I verify if you are referring to AD9958 which is a DDS part? Or is your question about AD9558? If it is, maybe someone in the Clock and Timing Community can help you.
The link for this community is here: http://ez.analog.com/community/clock_and_timing.
Hope this helps.