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Troubleshooting AD9675 JESD204B link

Question asked by tonyle on May 31, 2016
Latest reply on Jun 10, 2016 by tonyle

The troubleshooting continues on our AD9675 design. We are unable to train/sync the JESD204B link. When we physically probe the SERDOUT± pins, we find they are static at 900 mV (common-mode voltage). We've checked that CLK± is running at 100 MHz and verified that PDWN and STBY are both low. We can read in and out of the SPI memory. One thing we've noticed is that SYNCINB± has a -300 mV differential (should be OK), but they are 1.0 V and 1.3 V (+/- respectively) thus not centered on the common-mode voltage of 0.9 V. Could this be an issue? And is there a troubleshooting checklist I can look at for this sort of problem?