Cirrus Logic CS4373A - Manual (Page 30)

CS4373A
30 DS699F2
10. TERMINOLOGY
• Signal-to-Noise Ratio (Dynamic Range) - Ratio of the rms magnitude of the full-scale signal to the integrated
rms noise from DC to 430 Hz. The following formula is used to calculate SNR:
• Total Harmonic Distortion - Ratio of the power of the fundamental frequency to the sum of the powers of all
harmonic frequencies from DC to 430 Hz. The following formula is used to calculate THD:
• Full-scale Bandwidth - The bandwidth in which the converter can generate a full-scale signal while maintaining
performance specifications.
• Impulse Amplitude - The maximum amplitude of the output signal beyond the full-scale bandwidth.
• Differential Output Level - The voltage between the analog output pins of the device.
• Full-scale Accuracy - Variation in the measured output voltage from the theoretical full-scale output voltage at
1x attenuation. The following formula is used to calculate full-scale accuracy:
• Relative Accuracy - Variation in the measured output voltage from the theoretical attenuated output voltage at
each of the attenuation ranges. The following formula is used to calculate relative accuracy:
• Full Scale Drift - The variation of the measured full-scale voltage across the specified temperature range.
• Common Mode Drift - The variation in the measured common mode voltage across the specified temperature
range.
SNR = 20log
rms magnitude of full scale signal
rms magnitude of noise floor
(
(
THD = 10log
power of the fundamental frequency
sum of the powers of the harmonic frequencies (
(
full scale accuracy =
measured full scale voltage - theoretical full scale voltage
theoretical full scale voltage
(
(
•100%
| |
relative accuracy =
measured attenuated voltage - theoretical attenuated voltage
theoretical attenuated voltage (relative to the measured full scale voltage)
(
(
•100%
| |