I'm using the MCP3421 to read voltages from thermocouples on battery power.
I would like to get this working over USB but I think the low common-mode range of the ADC could be problem so I am thinking about isolating the ADC from the USB micro.
It seems like the ISO1540 i2c isolator could isolate data so I would need an isolated way to power the ADC.
What are my options to supply an isolated few milliamps for the ADC and what impact would these have on the common-mode range?
Ideally I would like the solution to be as small and low cost as possible!