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Q: I’m trying to communicate with ADXXXX but the output doesn’t respond to the commands?
A: Take an oscilloscope shot of your digital lines and check the following items:
Read : some DACs have the SDO pins disabled by default. The AD5754 is one of the of these devices which has the capability to disable the SDO pin.
The customer needs 0.7xVLOGIC for a HIGH to have a valid communication with the AD5671, so when 5V is connected VLOGIC pin, the logic “HIGH” should be 3.5V at a minimum to have a reliable communication interface. Possible workaround for this is to use a level translator to increase the “HIGH” voltage or decrease the supply to the VLOGIC pin to match the microcontroller interface.