I am using DDS 9914. During switching on, DDS is working fine. When I am trying to switch off DDS clock while maintaining the power supply, once in a while spurs are getting generated in band. Is it some reset issue.
Try recalibrating the DAC after switching the DDS clock back on.
The problem was not with DAC calibration. Actually the switching on and off was independent of SYNC clock. So I changed the programe to write the DDS registers with respect to the sync clock itself by sequencing of soft power down.
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