ADC Resolution Calculator
Calculate the voltage resolution, step size, and digital output code of an analog-to-digital converter.
V
V
Must be 0 to V_ref
Digital Output Code
512
Step Size (1 LSB)3.223 mV
Reconstructed Voltage1.6500 V
Quantization Error0.000 mV
Total Levels1,024
Digital Output Code vs ADC Resolution (bits)
ADC Resolution and Digital Conversion
An ADC maps a continuous voltage range to discrete digital codes. The resolution determines the smallest detectable voltage change.
Formulas
Step Size = V_ref / 2^N
Digital Code = floor(V_input / Step Size)
Quantization Error = V_input - Code x Step Size
The maximum quantization error is +/- 0.5 LSB.
Example Calculation
10-bit ADC with 3.3 V reference, input 1.65 V.
- 01Step size: 3.3 / 1024 = 3.223 mV
- 02Digital code: floor(1.65 / 0.003223) = 512
- 03Reconstructed: 512 x 0.003223 = 1.6504 V
- 04Error: |1.65 - 1.6504| = 0.4 mV
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