In my scheme there is an internal power supply 3.3 V. I connected it hrough the decoupling diodes to the tied together terminals IODVDD and DVDD.
While debugging, I found that in the absence of loop powering digital part works, but the analog part is not functional. I also found, that there is no voltage on REFOUT1,2.
Is there a possibility to combined powering of AD5421 ? First of all, I'm interested in the measurement of die temperature and loop voltage , even in the absence of external loop powering.