AD/DA conversion
For AD converters with the same input range, what happens when the resolution (number of bits) is increased?
- AThe voltage per LSB becomes larger, so small changes can no longer be distinguished
- BThe sampling frequency automatically increases
- CThe voltage per LSB becomes smaller, so finer voltage differences can be distinguished
Show answer and explanation
Answer: C. The voltage per LSB becomes smaller, so finer voltage differences can be distinguished
An N-bit converter divides the input range into 2ᴺ steps. Each additional bit doubles the number of steps and halves the voltage corresponding to 1 LSB, so finer voltage differences can be represented.
- A. More bits make 1 LSB smaller.
- B. Resolution and sampling frequency are separate specifications.
- C. Correct. 1 LSB becomes smaller, allowing finer distinctions.