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ADuM1401 input

Question asked by tonyhaywood on Dec 8, 2015
Latest reply on Dec 9, 2015 by tonyhaywood

We’ve been doing some tests on above, and get considerable oscillation on output when i/p risetime is 100us or so. Please see attached screenshot: yellow trace is i/p signal, 4.9v p-p, risetime of 100us (ignore Y axis scale for signal – x10 probe attached). Blue trace is o/p signal – as you can see, any amount of noise on i/p is giving rise to multiple o/p transients.

 

Is there any form of hysteresis on the input? The datasheet implies it’s Schmitt but it doesn’t act like it. Is there a pin for pin compatible device which does have Schmitt inputs?

 

ADuM1401_input.jpg

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