>There's other solutions to this problem too. Look at isolation
>amplifiers from TI(try ISO120) or Analog(try ad202 or ad210).

I better solution is the Agilent HCPL-7800 which is designed for isolating
motor current sense resistors in exactly the way described by the OP. get
the application notes as well.

These are great linear opto-isolators, but can handle only small input
voltages.

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