Digital Potentiometer for Communications & Telecom

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• Using a digital potentiometer in place of S1 and S2 allows digital control of the gain of this circuit to be swept from -1 to +1. A feature of the DS1267 is that it powers up with the wiper in the center of the pot, resulting in equal levels being present at the inverting and noninverting inputs. This causes no output from the op amp, creating an effective power-on mute function