Astrid
Full Member level 3
Hello, I need add to my design DAC and Voltage Ref. unfortunately, the price limit says it has no money and and therefore I have to use low cost components.
As Vref any as TL431.
Unfortunately, slightly larger temperature drift and noise than I imagined.
Temperature drift is problem, bud partly it to me hopefully compensate by software.
Question is how reduce noise?
My idea
C5,C6 and R4 is filter and because for the price I can not use an amplifier and on R4 is voltage loss 11mA have feedback over R4
the question is what to do with the stability and noise TL431?
![TL431.png TL431.png](https://www.edaboard.com/data/attachments/58/58778-edb1d64704a5daef30542d7d51a1705b.jpg)
As Vref any as TL431.
Unfortunately, slightly larger temperature drift and noise than I imagined.
Temperature drift is problem, bud partly it to me hopefully compensate by software.
Question is how reduce noise?
My idea
C5,C6 and R4 is filter and because for the price I can not use an amplifier and on R4 is voltage loss 11mA have feedback over R4
the question is what to do with the stability and noise TL431?
![TL431.png TL431.png](https://www.edaboard.com/data/attachments/58/58778-edb1d64704a5daef30542d7d51a1705b.jpg)