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AD5421 supplies

Question asked by YanLeb on Sep 21, 2012
Latest reply on Sep 25, 2012 by YanLeb


I want to use the AD5421 for a loop powered 4-20mA application, but I don't want to use the internal regulators to supply the digital section of the device, I just want to make sure that I can leave the DVDD and REGOUT pins open if I already have a 3.3V available on the design or if I need to add decoupling or some load even if not used. I want to use the loop voltage only to supply the 4-20mA generation section and want to connect the SPI interface directly to the microcontroller. Here is a schematic example of this solution. thank you