PIC Vref

Thread Starter

R!f@@

Joined Apr 2, 2009
9,682
I am planning to use separate Vref with ADC.
My question, is should I bypass the Vref+ or not. The Vref will be taken separate from another circuit with jumper wires less than a feet together with ADC which I want to check.
 

ErnieM

Joined Apr 24, 2011
8,007
Yes, absolutely add bypass, both at the ref source and at the PIC.

A bit of series impedance isn't a bad idea either, say 100 ohms to give the cap something to break against.

And your oscilloscope will be your friend here for design validation.
 

Thread Starter

R!f@@

Joined Apr 2, 2009
9,682
OK...a 100nf as the Vref+ to bypass it.
I am not sure why a 100R series with the Vref+
Can you explain why.
 
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