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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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  • Hello Dave,

    Thanks for your reply. I'm wondering if ADI offers an isolation solution which combines 1.8V level on one side, 3.3V to 5.0V on the other and has isolated power source in a single IC package?

    I could find ADI's ICs with integrated isolated regulator, however logic levels from both sides are out my specs (1.8V). It appears I have two solutions:

    1) Use, for example ADUM5402 in conjunction with voltage translator

    2) Use ADuM3482 and the part you suggested (ADuM5010).

    Please let me me know if there is other solution from ADI.

    Thanks.

Reply
  • Hello Dave,

    Thanks for your reply. I'm wondering if ADI offers an isolation solution which combines 1.8V level on one side, 3.3V to 5.0V on the other and has isolated power source in a single IC package?

    I could find ADI's ICs with integrated isolated regulator, however logic levels from both sides are out my specs (1.8V). It appears I have two solutions:

    1) Use, for example ADUM5402 in conjunction with voltage translator

    2) Use ADuM3482 and the part you suggested (ADuM5010).

    Please let me me know if there is other solution from ADI.

    Thanks.

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