What term describes the smallest change in output voltage due to a change in digital input?

The correct term for the smallest change in output voltage resulting from a change in digital input is resolution. Resolution refers to the capability of a system to distinguish between small differences in input, which, in this context, translates to how finely a digital signal can be represented in terms of its output voltage.

In digital systems, the resolution is influenced by the number of bits used in quantizing the input signal. For instance, a system with higher resolution can represent more discrete values, allowing for a more granular output. This is critical in applications where precise control and measurement are necessary.

The other terms do not accurately represent this concept. Accuracy refers to how close a measured value is to the true value rather than the ability to detect small changes. Settling time is the duration it takes for a system to stabilize after a change in input, while threshold refers to the minimum level of input required to produce a specific output, neither of which addresses the smallest detectable change in output voltage.