ADuM3482  ground separation

Hi, I I'm looking for a suggestion how to separate isolated grounds...

My design requires 4 isolated lines, two IN, two OUT and GND connected to the DB-9 connector. Side 1 (FPGA) has a 1.8V level and the other side 2 (ext interface) is required 3.3V or optionally 5.0V level.

I found ADuM3482 to meet my design goals, however it appears that I need to have a separate isolated power source to supply side 2. That means addition of DC-DC transformer driver, transformer, diodes and LDO just to provide isolated  supply to side 2.

As I mentioned above, only Data and GND are required, it is not required to provide voltage to the DB-9 connector.

First of all, I would like to ask if what I described above regarding ADuM3482 ground connectivity is correct and if it is possible to separate Side1 GND and Side 2 GND just using a choke and supply side 2 with local 3.3V or 5.0V which are referenced to digital ground?

I'll appreciate any suggestions.

Thanks.

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    •  Analog Employees 
    on Aug 2, 2018 2:27 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:27 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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