Hyejun, I'm not sure I understand the need for the isolation between the loop and the DAC161S997 but I think it should be ok. In the transmitter, I generally see the device operating at the same voltage as the loop, without the need of an isolated DC DC converter. In your schematic, this is the ME124S-24E, and I would not think this is necessary. I'm not sure if there would be issues measuring the loop current because of the DC DC conversion. Other than that, I think that +VOUT of the ME124S-24E would be the LOOP+ node that sources the loop current going to node A of SD4. Then -VOUT of the ME124S-24E would be the LOOP- node going to node C of SD5. Joseph Wu
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