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Externally powered AD5421

Question asked by Youri.K on Dec 9, 2012
Latest reply on Dec 10, 2012 by tjohnson


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.