Hi Tim, As far as I can tell you should be able to use the 3.3V from the LM3480 to power the ADS1220 with no issues. What is not clear is the difference between GND and PGND. The documentation appears to use the symbols as GND for all instances. According to the schematic the LM3480 is referred to PGND. All the connectors with 3.3V show GND. I think it is the same net, but you may want to check into it further. Best regards, Bob B
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