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ADM7151 self excited

Question asked by on Jul 22, 2015
Latest reply on Sep 13, 2015 by

I used ADM7151 for PLL+VCO power supply ,If the load 400mA current ,then the VCO output will uperimposed spur,if don't use ADM7151, the output is correct.,attachment are ADM7151 circuit diagrams and test phenomena ,so I want to know why ?