Hi, What are the results if you use continuous SYSREF instead of single shot SYSREF? If all 4 DACs work with continuous SYSREF then you can adjust the timing between SYSREF and device clock at the failing DACs to ensure reliable capture of SYSREF. Also note that SYSREF should be DC coupled to LMK if using one shot SYSREF and the common mode must be ~500mV. Thanks, Eben.
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