Hello. I'm testing a R2R 7bit dac. The problem I have is when I write all the output HIGH the max voltage after the dac is 4,5v. The code is only this: void setup(){ for(int i = 0; i < 7; i++){ pinMode(i, OUTPUT); } } void loop(){ for(int output = 0; output < 7; output++){ …

can't reach 5v with R2R DAC

TomGeorge April 12, 2014, 11:51pm 6

Hi, with 200K resistors is the output impedance of the R-2R to high and the DMM loading is causing a problem.
I'd say use 10k and 20k and see what happens.

Tom.....

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can't reach 5v with R2R DAC

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