piclist 2003\05\09\195006a >
Thread: Decoupling Aref when using AVcc on ADC
www.piclist.com/techref/io/atod.htm?key=adc
picon face BY : John Samperi email (remove spam text)



At 08:17 AM 9/05/03 -0700, you wrote:
>Refering to the MEGA8 ADC reference voltage, two sources mention
>decoupling Aref pin with a capacitor when using AVcc as the voltage
reference.
>
>I am unable to find what capacitor value or how to install.
>
>So can I assume I use a .1uF mono tant. between AVcc and ground?

John

The AT90S8535 specs show a 100R in series with AVCC and a 10nF
from AVCC to ground. But as David mentioned you may have to adjust
these to your condition. I'm using the above values in one of my boards.

Regards

John Samperi

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