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?