DAC/ADC terminology refresher: The difference in analog output (or input) between two adjacent digital codes is called the analog step size. What term formally describes this quantity in data converters?

Introduction / Context:
When working with data converters, precise terminology matters. The analog spacing between adjacent digital codes sets how finely a DAC can increment its output (or an ADC its discernible input). This spacing is a cornerstone concept in converter selection and error budgeting.

Given Data / Assumptions:

• We consider an ideal N-bit converter with full-scale range VFS.
• Adjacent code difference is identical across the range in the ideal case.
• We seek the formal term for this smallest code step.

Concept / Approach:
Resolution describes the smallest analog change corresponding to a 1-LSB digital change. In volts, step size = VFS / (2^N). In current-output DACs, the step is in amperes. Quantization is the process of mapping a continuum to discrete steps; monotonicity means output never reverses as code increases; accuracy and linearity describe closeness to ideal behavior, not the step size itself.

Step-by-Step Solution:
Identify adjacent codes k and k+1.Analog difference for an ideal DAC = 1 LSB.1 LSB = VFS / (2^N) (for voltage-output converters).Therefore, the term is “resolution.”

Verification / Alternative check:
Check a converter datasheet: “Resolution: N bits; LSB size = VFS / 2^N.” This explicitly equates resolution with step size.

Why Other Options Are Wrong:
Quantization (option A) is the act/process, not the step magnitude.

Accuracy (option B) is overall closeness to truth.

Monotonicity (option D) is directional correctness across codes.

Linearity (option E) concerns deviation from the ideal straight line, not step size.

Common Pitfalls:
Confusing “effective number of bits” (ENOB) with nominal resolution; ENOB reflects noise and distortion and can be lower than N.

Final Answer:
resolution