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Original question:

ISOM8111: Minimum Primary Voltage?

ISOM8111: Ternary Output?

johny radio
Expert 1280 points

Part Number: ISOM8111
Other Parts Discussed in Thread: ISOM8110

Is there any way a single ISOM811x can output ternary states? For example:

-1, 0, +1

or

0, 1, high-impedance

  • 0
    TI__Mastermind 34580 points

    Hi Johnny, 

    There is no option for ISOM811x to be used as "0, 1, High-Z" since it won't have a formal tri-state buffer. However, -1, 0, +1 may be possible using the ISOM8111 (or ISOM811(5-8) for bidirectional input). However, I think the answer will depend on what you need the output/control signal to be. I took a swing at simulating this using PSPICE for TI. 

    Below shows a simple operation where ISOM8110 will track the input signal and is decoupled using a series capacitor to get a +V or -V state. The input voltage will also match any intermediate state to match a 0-crossing. 

     

    Let me know if this is a good start or not. 

    Best,
    Andrew

  • 0 in reply to Andrew J
    Expert 1280 points

    Thanks for this! I just saw it.

  • 0 in reply to johny radio
    TI__Mastermind 34580 points

    Hello Johny, 

    Thanks for coming back. The ISOM8110 is designed to have a transistor output similar to a traditional BJT. This means that the part can be used in designs flexibly almost as a discrete. Please let me know if this was useful. 

    Best,
    Andrew