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Multiplexer digital input voltage limits

Discussion in 'General Electronics Discussion' started by Jimbo bob, Apr 15, 2015.

  1. Jimbo bob

    Jimbo bob

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    Oct 8, 2014
    Hi everyone:),

    I was going through the data sheet for ADG706_707 multiplexer. I am planning to power it with +2.5V and -2.5V. When I go to the absolute ratings section on page 5 it says:
    and then there is a footnote for it:
    I was planning to feed the digital inputs of the multiplexer (i.e. A0, A1, A2 and A3) with Arduino Mega's digital I/O which I think output 5V as a high voltage. Considering that on page 4, Vinh is 1.7V minimum and Vinl is 0.7 maximum, I am a bit confused whether I can still use Arduino's digital I/O or not with the MUX.

    Many thanks in advanced:)
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    1,861
    Nov 17, 2011
    A simple way to match the arduino's 5V outputs to the ADG706's digital inputs is a 1/2 divider. Use a resistive divider from the arduino's output to GND built from e.g. 2*1kΩ resistors. this will reduce the arduino's output swing from 0V...5V to 0V...2.5V, a perfect match for the multiplexer.
     
    Jimbo bob likes this.
  3. Jimbo bob

    Jimbo bob

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    Oct 8, 2014
    Thank you Harald:). It makes sense and it seems that is the best way of going about solving this problem.
     
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