Hello Peter,
Since last month I am doing alot of experiment on harware and
I am using Avnet's reference design, I have noted two points while verifying it on hardware,
(1) If I am providing external loop back i.e. from DAC to ADC, then at the output of DDC we should get a perfect sinusoid, But I am not able to get it, and I have checked output of DAC on oscilloscope that is a perfect sinusoid, Why it is so ? and I have followed all the steps correctly.
Now, If I am providing single channel feedback then at the output of DDC I am getting perfect sinusoid on both the channel,,,,,,,,Why.....?
(2) Now if I am giving 10 MHz external signal from signal generator to the ADC and I have bypassed it directly to the DAC ,So it should give same signal at the output But it is not happening, Why ?
(sampling rate of ADC is 61.44 MHz ) and f I am giving 30.72 MHz external signal from signal generator to the ADC then it is showing me appox. same signal,,,,,,,,,,I am not getting that Why ? it is happening.