CS4373 Просмотр технического описания (PDF) - Cirrus Logic

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CS4373

Low-power, High-performance ∆Σ Test DAC

Cirrus Logic 

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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