I am juan, I am using TC234 for designing. VDDM is supplied by 5V from TLF35584 directly, and VAREF is supplied by VDDM passing through a bead, now I removed this bead which means VDDM can not supply for VAREF,but I measured around 3.9 volts voltage at VAREF while VDDM was 5V. I fell confused, why is there a voltage at VAREF when there is no external supply for it? Could you please give me some advices or some instructions？
thank you in advance.
my schematic is as below：
there is a L401 between 5V_ADC power supply and VAREF pin originally，but I found there is still 3.9 volts at VAREF after removing L401.
Hi thanks for your schematics,
if you powered up your board with L401 connected and try to measure voltage level without it afterwards, your capacitors could be still charged, which could be the reason for your findings.