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AD9910 XTAL input and SYNC_CLK

Question asked by nedds on Nov 22, 2012
Latest reply on Nov 27, 2012 by nedds

Question 1:

I am using 25MHz crystal as REF_CLK input. When I power on all voltage inputs of DDS except DVDD 3.3V , at REFCLK_OUT I am seeing 25MHz signal output. When I connect DVDD 3.3V pin then the signal goes off. Is this normal ?

 

Question 2:

After power on all the voltage inputs, I am doing a master reseting and then at SYNC_CLK pin I am seeing some signal which is changing 43 to 62 MHz but it should be 25/8 MHz, right ? Should I do something to start it properly with XTAL input ?

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