CS4373 Datasheet, PDF (9/20 Pages) Cirrus Logic – Low-power, High-performance Delta-Sigma Test DAC

CS4373
2. TERMINOLOGY
• Dynamic Range (Signal-to-Noise Ratio) - Ratio of the rms magnitude of the theoretical full
scale signal to the integrated rms noise from DC to 400 Hz. The following formula is used to
calculate this value:
( ^{SNR = 20log}
rms magnitude of full scale signal
rms magnitude of noise floor
• Total Harmonic Distortion - Ratio of the power of the fundamental frequency to the sum of the
powers of all harmonic frequencies from DC to 400 Hz. The following formula is used to cal-
culate this value:
( ^{THD = 10log}
sum of the powers of the harmonic frequencies
power of the fundamental frequency
• Full Scale Bandwidth - The bandwidth in which the converter can generate a full scale signal
while maintaining all performance specifications.
• Wideband Max Amplitude - The maximum amplitude of the output signal beyond the full scale
band-width.
• Differential Output Level - The peak-to-peak voltage between the analog output pins of the
converter.
• Absolute Accuracy - Variation in the measured output voltage from the theoretical output volt-
age at each of the attenuation ranges. The following formula is used to calculate this value:
( ^{absolute accuracy =}
measured attenuated voltage - theoretical attenuated voltage
theoretical attenuated voltage
•100%
• Relative Accuracy - Variation in the measured output voltage from the theoretical output volt-
age (relative to measured full scale signal with no attenuation) at each of the attenuation
ranges. The following formula is used to calculate this value:
( ^{relative accuracy =}
measured attenuated voltage - theoretical attenuated voltage
theoretical attenuated voltage (relative to the measured full scale voltage)
•100%
• Offset Error - Variation from the theoretical common mode voltage generated by the convert-
er. The following formula is used to calculate this value:
( ^{offset error =}
measured offset
theoretical full scale voltage
•100%
• Full Scale Drift - The variation of the measured full scale voltage across the specified temper-
ature range.
• Offset Drift - The variation in the measured offset voltage across the specified temperature
range.
DS577F1
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