Please suggest a technique to interface two 3 wire RTDs to AD7124-4.
Is this feasible by selectively switching IOUT1 and IOUT2 to different Analog inputs, while maintaining a common Reference resistor?
Yes, AD7124 uses a flexible multiplexer, thus you can output the excitation current at any analog input pins. However, it is recommended to disconnect your reference circuit to the other RTD while connected to the second RTD to ensure that it may not affect the measurements of each other. So either you put a link connection between the two RTDs going to the reference node or you provide a separate reference resistor for each RTD and configure it via software.
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