I want to build a 16 bit R2R DAC using two 74HC595 chip. I need the DAC to replace the potentiometer of a lab PSU.
While researching, in the forums and basically everywhere they suggested that R2R DACs shouldn't be above 8-10 bits because they lose precision in higher bits and I have to use 0.001% resistors. but because I'm not going to use it for some audio stuff, even +5-10% of error is fine. as long as I'm getting steps below 1mV.
- Is it practical to build a 16 bit R2R DAC for this purpose?