The AD8591 datasheet shows that the amplifier's output is high-impedance when in SHUTDOWN, but is it also high-impedance when unpowered?
Take a look at the schematic and also read MT-088 on our website. If the part is not powered,
then we can't say what the parasitic diodes and unpowered MOSFETs will do. Quite different
than a transistor with well defined conditions on each terminal.
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