Problems with an ADC

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DRO

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Hello,
I am currently using a FLASHY D ADC card from KNJN.
I need to test the card, and to make it work with an FPGA.
But there are some problems when I acquire the signal.
The period of the input signal is not the same as the output one.
I don't Know the input circuit of the ADC but I suspect that it is one
of these https://www.ti.com/lit/ds/symlink/adc08100.pdf PAGE 16,17,18.
Given that the ADC is one of T.I. there might be no problems with the ADC itself.
I don't know. So if someone could help me with this. If anyone has an idea
of where can be the problems.

Thyank you very much.
 

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