AVR-Chat

Hi,
 
	I have an application where a simple and cheap zener regulator with
emitter follower would be my best ( cheap) option for powering a Atmega168
with the AD converter using the internal 1.1 volts reference. As the input
voltage range is way to big, from about 5 volts up to 40 volts, the
regulation will not be too good because the zener current will vary too
much.
 
	I did not find any references if I will get into trouble varying the
supply at the AVR in the range of 3 to 5 volts. Does anyone have references
or opnions about this ? Would the AD suffer from those variations in supply
voltage even using the internal bandgap as a reference ? I just need 8 bit's
out of the AD...
 
	I would appreciate any insight. I always try to make the power
supply as stable as possible and letting it out to the microcontroller with
such a big variation feels really weird to me... But I looked around all I
could and did not find anywhere saying that I could not do it with a micro
that is specified for this full range !
 
	Thanks in advance...
 
Best regards,
Alexandre Guimaraes