Terminology in DAC specifications: the number of binary input bits that a DAC accepts is referred to as its ________.

Introduction / Context:
Digital-to-analog converter datasheets contain several common terms: resolution, accuracy, linearity, and monotonicity. Distinguishing these concepts is foundational for selecting and applying DACs.

Given Data / Assumptions:

• The DAC accepts an N-bit digital input word.
• We are naming the parameter that counts those bits.
• Definitions follow standard instrumentation terminology.

Concept / Approach:
Resolution is the smallest step size the converter can produce, typically 1 LSB = full-scale range / 2^N, where N is the number of input bits. Accuracy describes how close the actual analog output is to the ideal value. Linearity (INL/DNL) measures deviation from an ideal straight transfer curve. Monotonicity means each code step never decreases output value.

Step-by-Step Solution:

Verification / Alternative check:
Datasheet tables list “Resolution: N bits” separately from accuracy specs, confirming the terminology.

Why Other Options Are Wrong:
accuracy: depends on gain/offset and linearity errors, not just bit count.

linearity: relates to code-to-output straightness.

monotonicity: property of always increasing with code; not a count of bits.

Common Pitfalls:
Equating bit count with accuracy; a high-resolution DAC can still be inaccurate if calibration is poor.

Final Answer:
resolution