I have a design that incorporates two ISO721MMDREP devices to transfer static logic signals across an isolation barrier.
The same isolation barrier is bridged by an isolated 300Watt DC/DC converter that is operating at 100kHz. This converter is inducing some amount (<50mVAC) of common mode noise across the isolation barrier at the fundamental switching frequency of 100kHz.
Even when the input signals to the ISO721MMDREP are shorted, we see very short noise transients (less than 1uS) at 100kHz at the output of the isolator.
The issue originally appeared at cold temperature soak (-40C), but now appears at room temperature also.
Is the ISO21MMDREP susceptible to common mode noise at 100kHz across the isolation barrier?
