Hello, I want to calculate power dissipation for a digital isolator I am using (MAX14434EAWE+). However, the supply current numbers in the datasheet don't seem consistent with each other so I'm not sure which ones to use.
Just for an example, Sheet 3 of the datasheet has a table with typical values. The table is unclear but I believe this should be showing current per active channel? Looking at IDDA at 12.5MHz, CL = 0pf, VDDA = 5V, it says 1.63 mA typical. Looking at IDDB at 12.5 MHz, CL = 0pF, VDDB = 5V, it says 2.97 mA typical.
However, when I look at the curves on Sheet 13, they give quite different values. IDDA for 12.5MHz, VDDA = 5V is around 0.65mA. IDDB for 12.5MHz, VDDB = 5V is around 1mA.
Then when I look at Sheet 21-22 it says to use Figure 8 and Figure 9 which also give completely different values.
Questions:
What is the relationship between the table on Sheet 3 and the curves on Sheet 13? Which should I use for calculating power dissipation in the part? Can you confirm that both of these are showing "current per channel"?
Thank you for any help.