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AD-9850 DDS troubles

by Ravaner
Tags: ad9850, troubles
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Ravaner
#1
Jul26-14, 04:32 AM
P: 97
Hello. I've create a VFO board using AD9850 module (PCB including 125 MHz crystal ... ). It works. My working frequency is around 20 MHz. But ... I've noticed a small jitter, mainly in frequency. With my scope I've discovered a low frequency (between 300 and 1500 Hz according to the board in test) with same amplitude that HF signal, about 400 mV p-p which appears on same output. Has someone an idea about this default and how to suppress this modulation ?
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