pelek Posted May 5, 2020 Report Posted May 5, 2020 Hello. I'm testing AOUT module, and I don't have the same voltages on all 8 channels. I'm using for 10k Rx resitor, precision ones with 0.1% tolerance (and I picked by hand the same values from a lot). But even with the same resistors, one chanell gives me 1.0v-2.1v-4.2v-8.4v, one 1.1v-2.3v-4.6v-8.8v, one 1.0v-1.98v-3.8v-7.8v etc. Any suggestions ? I should test many TL074's until I find the right ones ? Thank you.
latigid on Posted May 5, 2020 Report Posted May 5, 2020 I suppose you mean an AOUT with MAX525? What app are you testing with? The SEQ has a calibration part too. But first, have you adjusted the trim pots to give a good scaling factor? The DAC with external reference outputs a voltage between 0-2.048V with graduations of 1/4096. The gain equation is also on the page.
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