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Differential Signal Isolation
IL600-Series Isolators are ideal for isolating differential signals because you have access to the input coils and do not need input power to drive the signal across the barrier:

In this illustrative circuit, when the voltage at node Y is greater than the voltage at node Z there is a logic high at the OUT+ node and a low on the OUT- node. Outputs are reversed when the voltage at node Z is higher than the voltage at node Y. Current-limiting resistors can be selected to ensure input coil currents are at least 5 mA and no more than 10 mA.

 Application Bulletin: Differential Line Receivers Using IL600-Series Isolators (.pdf)

IL611 Isolator product details

IL600-Series data sheet (.pdf)

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