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AD9910 Evaluation Board no SYNC_CLK with external control

Question asked by dnn on May 31, 2017
Latest reply on Jun 1, 2017 by dnn

Hello,

 

I'm trying to program the AD9910 evaluation board through the SPI interface. However, when the jumpers are configured to allow external control of the DDS, the SYNC_CLK signal disappears after a fraction of a second when the board is powered up. If I configure the jumpers for control of the DDS by the evaluation board micro-controller the SYNC_CLK signal is as expected.

 

I haven't found anything in the manual that may explain this behavior. What may be wrong?

 

Thanks. Best,

Dan

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