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The VIH for the DAC8568 is 0.625×AVDD, which is 3.125V in your system. So I think you are correct that this could be a VIH issue. Can you reduce the AVDD voltage and test to confirm?
What are the other requirements for the device? Are you requiring a p2p replacement?
We don't have very many devices that have logic levels that are independent of the VDD supply, but maybe we can find one that fits. Otherwise you will need to adjust the logic level or lower VDD like Paul suggested.
