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ISO7720: ISO7720

Yongjae Park
Prodigy 10 points
Part Number: ISO7720

HI, TI Q&A Community, 

Could you let me know the electrical model of barrier capacitance and resistance of digital isolator such as ISO772x?

Thanks in advance, 

YJ

  • 0
    Prodigy 10 points

    Plus, does it depends on channel count?

  • 0 in reply to Yongjae Park
    TI__Genius 17815 points

    Hello,

    Thank you for your question and welcome to E2E.

    The barrier capacitance of the ISO7720 is ~0.5pF. The barrier capacitance (CIO) and isolation resistance (RIO) is shown below (section 6.6 in datasheet):

     

    The barrier capacitance depends on various factors and can be different between other digital isolator devices. The isolation resistance remains the same across the different digital isolator devices.

    Regards,
    Aaditya Vittal

  • 0 in reply to Aaditya V.
    Prodigy 10 points

    I really appreciate your kind reply, Aaditya.

    I just want to confirm that the barrier capacitance (~0.5pF) and Isolation resistance are in parallel between two isolated ground nodes?

    Warm regards, 

    Yongjae

  • +1 in reply to Yongjae Park
    TI__Genius 17815 points

    Hello,

    Thank you for your reply. 

    Yes, the barrier capacitance and isolation resistance are measured in a two-pin configuration.

    Two-pin configurations is where all pins on side 1 are joined to make one pin and all pins on side 2 are joined to make a second pin. Then the barrier capacitance and isolation resistance are measured in parallel to those two pins.

    Regards,
    Aaditya Vittal