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optocoupler FPGA

Discussion in 'General Electronics Discussion' started by wron, Oct 20, 2009.

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  1. wron


    Oct 20, 2009
    I have a comparator output (square 0-5V) signal that i have to send to FPGA spartan3 Xc3s1500, 3.3V required. Which optocoupler would you recommend me? there exist a lot of them that it would work, but i don't know which one could be the most appropriated one.
    Thanks in advance!
  2. Resqueline


    Jul 31, 2009
    I guess the ideal choice depends on any other particular requirements you might have (frequency, currents etc.).
    Things to consider: Current Transfer Ratio, Saturation Voltage, Rise & Fall Times.
    CTR must be as high as possible if you want to save on the drive current for any reason.
    SV must be low enough to satisfy the 3.3V logic levels of the FPGA.
    R&FT speaks for itself.
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