jcarruthers
Well-known member
the lm4040 doesn't exist in 3.3v, just 2.0, 2.5, 3.0, 4.096 and some larger values. mouser for example has the 3v version in the TO92 package, but i wouldn't worry too much if you can't find one/don't want to put in a large order with them. note that on the teensy there's a 470R resistor already connecting the AREF pin to 3v3, which would correspond to "Rs" in the lm4040 data sheet (or the 3k3 one in the Tides datasheet.)
The 3k3 one between the 3.3v input and the 2.5 output?
So I can just omit the 3k3?