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using AD9515 for making coincident IO_UPDATE signals

Question asked by Sahar on Apr 20, 2015
Latest reply on Apr 22, 2015 by Sahar

Hi everyone,


I want to synchronize two AD9915 DDS according to AN-1254 document. In this document AD9515 is used for distributing IO_UPDATE to DDS ICs. It is indicated in the document, IO_UPDATE signals should be coincident for two DDS ICs at the last step of synchronizing but one CMOS output of AD9515 is inverting and the other is noninverting when the output is configured in CMOS mode. How can I use AD9515 for making coincident IO_UPDATE signals?