I request more explanation on the common noise filtering capacitor on page 17 of the LT3960 datasheet https://www.analog.com/media/en/technical-documentation/data-sheets/lt3960.pdf.
How is the common mode noise is suppressed with the capacitor? The olive line at the bottom of the graph is labelled CANSDA_CM. What does CANSDA_CM represent? Is it 0.5*CANSDAH + 0.5* CANSDAL? What is the difference between the blue and green lines of figure 11 and 12 which make such a huge impact on the CANSDA_CM?
I was expecting common mode filtering would be done something along the lines of this at page 5-13: