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I was reading about String DACs here https://www.allaboutcircuits.com/technical-articles/voltage-mode-r2r-dacs-operation-and-characteristics/

and I saw enter image description here

enter image description here

Is the highlighed wrong? I mean, if just SW4 was on, shouldn't the output analog voltage be 1/2 Vref, since there are 4 resistors above SW4 and 4 below

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You are correct. The author probably meant to write

For example, to produce an analog output equal to VREF/4, we only need to turn the switch sw2 on.

Note that with this circuit the output range is 0 to VREF × 7/8. You can't get VREF.

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  • \$\begingroup\$ Great! I was doubting myself for 15min. Thought there was no hope for me if I messed up a resistive divider haha. \$\endgroup\$ – AlfroJang80 Sep 24 at 20:17

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