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LTC6804 isoSPI Layout Guidelines

Does the isoSPI Guideline number 2 found in the LTC6804 data sheet apply if I am using the LTC6804-1 in , specifically number 2, apply if I am connecting multiple LTC6804-1's on the same PCB as shown in Figure 44 of the data sheet?  What is the purpose of not extending the V- ground plane under the transformer?


  • Extending the V- ground plane under the transformer could allow noise from the transformer to couple into the ground plane.  Placing a slot helps prevents this.  It's the same reason we don't recommend extending the ground plane under the isoSPI connector and traces before the transformer.