(Sorry for the typo in the title, it's an R/2R ladder).
I'd like to build an 8 bit R/2R ladder-based DAC (with output buffer) to use for outputting low-fi audio from a microcontroller. What factors influence which exact resistor values I should use? I know I need two resistor values, one having double the resistance of the other, but how high/low do I aim? At the very least I assume they need to have enough resistance so I don't source too much current from my uC, but that still leaves quite a range.
I'm guessing this is related to input/output impedance of my DAC, but my understanding of those concepts is, shall we say, incomplete.
Thanks for any help anyone can provide!
I'd like to build an 8 bit R/2R ladder-based DAC (with output buffer) to use for outputting low-fi audio from a microcontroller. What factors influence which exact resistor values I should use? I know I need two resistor values, one having double the resistance of the other, but how high/low do I aim? At the very least I assume they need to have enough resistance so I don't source too much current from my uC, but that still leaves quite a range.
I'm guessing this is related to input/output impedance of my DAC, but my understanding of those concepts is, shall we say, incomplete.
Thanks for any help anyone can provide!