Part Number:CDC7005
Hi, i have been studying the CDC7005 way of operation and i am having difficulty understanding how the REF_IN (reference clock) is used. I get it that as soon as it is used the VCXO is outputing a frequency that is times the divider of the CDC7005. What about real-world usage? Let's say that CDC7005 + VCXO is used as an ADC clock. Does the REF_IN of the CDC7005 need to be driven by a near-ideal signal clock source that costs $10K ?
Can the REF_IN be driven by a noisy FPGA clock where clearly i can set it up to any frequency (within a valid range off course)?
Can the REF_IN be driven by a crystal oscillator which has a relatively limited noise & jitter?
Can you pls suggest other options driving the REF_IN?
My real project is to get a 124.8MHz, drive it through a narrow band-pass crystal filter and then pass it to the ADC.
Any help will be appreciated
Best regards
Manos