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[ADuM7234(CN0196)] VDDA voltage drop caused by DC voltage input

Question asked by tmineno Employee on Oct 2, 2014
Latest reply on Oct 2, 2014 by MMA

Hi All,


When I tested ADuM7234 by using CN0196 board, I faced a problem below.

When  the input voltages(PWM1 and PWM0 pins) are DC(duty cycle 100% or 0%), I think output (PWM_Q1 to Q4) should be DC but PWM_Q1 and VDDA2 dropped to low level periodically (see attached file).

I'd like to know the reason why this behavior is occurred on CN0196.

Could anyone tell me above things?