Enter your ADC's SINAD or SNR value into the ADC ENOB Calculator, select your calculation type, and find the Effective Number of Bits your converter actually delivers — along with the equivalent ideal ADC resolution and input signal level.
Effective Number of Bits
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Equivalent Ideal ADC Resolution
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Input Signal Level
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ENOB is a measure of the dynamic performance of an ADC or DAC. It represents the number of bits in an ideal converter that would achieve the same signal-to-noise performance as the actual device under test.
SNR (Signal-to-Noise Ratio) measures only the noise floor, while SINAD (Signal-to-Noise and Distortion) includes both noise and harmonic distortion. SINAD provides a more comprehensive measure of converter performance.
ENOB is typically measured by applying a pure sinusoidal input signal to the converter and analyzing the output spectrum. The ratio of signal power to noise and distortion power is used to calculate the effective resolution.
ENOB provides a real-world performance metric that accounts for all imperfections in the converter. It helps engineers understand the actual usable resolution versus the nominal bit specification.
Various factors reduce ENOB including thermal noise, quantization noise, clock jitter, nonlinearities, and harmonic distortion. These imperfections limit the effective resolution below the theoretical maximum.
The required ENOB depends on your application's dynamic range requirements. Audio applications might need 16-20 bits ENOB, while industrial measurements might only require 10-12 bits ENOB.