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Geng2019
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Registered: ‎09-14-2021

ZCU111 RF Data Converter Evaluation Tool have great frequency shift

Hi, guys. I have a ZCU111 board and want to have a precise frequency output generated by its DACs.

However, when I tried to use the Converter Evaluation Tool. Even the single-tone mode has a great spectrum shift as shown in the following picture. When I set the frequency to be 20MHz, the generated sin-wave is 17.94 MHz. There's some slight difference when I change the clock and the sample settings but the problem can not be solved. What's the problem and how can I have a precise frequency output?

Thank you for your help.

 1.png

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