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ADUM640x - Input ripple

Question asked by Bastler on Jan 27, 2015
Latest reply on Jan 28, 2015 by Bastler


Hello,

I need a high Isolation and switched from the ADUM5401 to the ADUM6401. Now I  have many disturbances at the Inputs (IA-IC), the ADUM5401 was "quiet".

I attached a Picture taken with our scope, where you see the 3 Inputs and the VDD1 from the ADUM6401.

The Inputs of the ADUM are driven by logic gates, so they don't have a high impedance and I don't know how to reduce the ripple.

 

Can you help me ?

 

Kind regards

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