ADG1419 digital input form

I use a ADG1419 with ±15 V DUAL SUPPLY. I connect first a mechanical switch for command (switch from +15V to 0V).

All is ok.

After that, I replace the mechanical switch by a digital output from a digital computer card (generate from 0 to 5V) : The ADG1419 switch doesn't switch !!!?

I don't understand why so :

- I tried with a function generator : frequency 1Hz, amplitude 0 to 5Vp triangle wave : The ADG1419 never switch

- I tried with a function generator : frequency 1Hz, amplitude 0 to 5Vp square wave : The ADG1419  switch normally each 1 sec

I think that the ADG1419 change is state when the logic input rise/drop upper/under a level.

With the test above it seems that the duration of the front on logic input have a incidence?

Do you have an explication ?...

scheme

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