we are using AD5755 and not using CRC or the Fault pin for SPI data check .
We are sending Fixed data to DAC and after noise test we see that even writing to Data register with Fixed data we see that output doesn't change , but if we write some other value ,DAC seems to be responding could you please let me know , what all the possible things effecting the DAC working . As DAC seems to be responding on writing other data then fixed data and not to Fixed data .
Is there a buffer which checks whether to latch the update data to DAC circuitry.
With best regards