SNR¶
Noise waveform - with no signal attached to the input
Document explaining the theory of the calculation
SNR calculation:
SNR = 20 * log10( (16384/2/sqrt(2)) / (std(noise_samples) )
where:
16384/2/sqrt(2) - RMS of the sinewave covering all the dynamic range of the ADC
std(noise_samples) - standard deviation of the noise, which is the RMS value of the noise
20 * log10() - for dB calculation
| Input voltage range | Standard deviation [bits] | SNR [dB] | Estimated ENOB (THD omitted) |
|---|---|---|---|
| 100 mV pp | 2.374 | 67.7 | 11 |
| 1 V pp | 1.651 | 70.86 | 11.5 |
| 10 V pp | 1.421 | 72.17 | 11.7 |