[sdiy] using a dac as a digitally controlled amplifier

[Roman Sowa]

Digital pot gives you access to all 3 leads of the "pot", while MDAC has 
one end of the taped to GND shared with the rest of DAC circuit, and 
also typicaly a R-2R ladder while digipot seems to be always a resistor 
string.
Digi-pot has also rather tight tolerances on absolute resistance value 
of individual step resistors in case you'd want to use it as rheostat. I 
mean "tight" in a sense that you can tell it's 100k pot and not 
somewhere between 50k and 200k. In MDAC it's "don't care how much as 
long as they are all the same, 14.3k sounds like a good value"
Other than that it seems to be basicaly the same thing.

Roman

W dniu 2024-08-05 o 20:38, Mattias Rickardsson pisze:
> Is this MDAC "trick" more or less equivalent to using a "digital 
> potentiometer", or are those ICs significantly different?
> 
> /mr
>