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  1. #1
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    About window comparator LTC1042

    I was simulating the window comparator LTC1042 for one of my application in which if my input voltage goes above 1.5V and below 0.5V its the fault condition. and if the input voltage is between the above voltage levels its the working condition

    But there are certain doubts that i have.

    1. for input values less that 0.5V the output isn't responding. for voltage higher 1.5V i am getting high value at the output.

    2. Does this IC behave perfectly for DC application? Because while simulating i faced an error telling about requirement of time domain simulation.

    3. If not, which IC is best suited for my application?

    Please help me to know where i am going wrong..

    Please find below snapshot for more understanding

    Thanks in advance for your help.Click image for larger version. 

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  2. #2
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    Re: About window comparator LTC1042

    I don't think you've read the data sheet.

    There are TWO outputs you need to look at: WITHIN WINDOW and ABOVE WINDOW. You've set your center for 0.88 and width/2 to .77. That means when Vin is greater than 1.65V the ABOVE WINDOW output is high and WITHIN WINDOW low. When Vin is below 0.11V the WITHIN WINDOW and ABOVE WINDOW outputs are both low. Between 0.11V and 1.65V WITHIN WINDOW is high, ABOVE WINDOW is low.



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  3. #3
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    Re: About window comparator LTC1042

    Hi barry,
    Actually i noticed it after i posted the question. Yes you are correct!!!
    Can you help me for any other window comparator IC that would suit my application?

    Thanks



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  4. #4
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    Re: About window comparator LTC1042

    Hi,

    A dual comparator with open collector output will do the job.

    Klaus
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  5. #5
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    Re: About window comparator LTC1042

    The common LM339/393 is often used for that purpose.
    Here's an example circuit.
    Zapper
    Curmudgeon Elektroniker


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