ADM2867EBRNZ requires FB on ISO_Ground?

Question

Hi. The ADM2867EBRNZ and series of new isolated rs485 xcvrs is of interest to us. In the review of the ref schematic, there is a recommendation for a FB in series with the ISO_GROUND pin. Is this required? The EVAL BOARD for this component does not contain the same FB on GND2. Just wish to design with the best solution. Thanks.

NQuinn · Accepted Answer

Hi Juthi, 
 Just confirming this, the ferrite beads are purely for EMI suppression, they are not needed for system functionality. 
 The best solution is to include the two recommended ferrite beads, one between GNDISO and GND2, and one between VISOOUT and VISOIN. 
 Regards, 
 Neil)

Mon2 · Answer

I think I have found the justification for this component...we will add it into our design.... 
 Although these ferrite beads are required to achieve compliance to EN 55032 Class B, they are not needed for system functionality. The ADM2861E/ADM2863E/ ADM2865E/ ADM2867E have been fully characterized with the recommended BLM15HD182SN1 ferrite beads.