Is it possible to use the ADuM4160 without the internal power regulation to avoid EMI? We have a power solution already, but would like to use this part for the USB data path.
The internal regulators are simple LDO's and do not contribute to EMI. EMI is generated by the encoded data pulses combined with mismatches in the coils. This allows some common mode high frequency current to couple across the barrier. to avoid EMI, keep the average data rate low, and use stitching capacitance across ht barrier. Using three terminal bypass caps helps as well.
Please refer to AN-1109 for details.
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