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AD7982 Datasheet(PDF) 8 Page - Analog Devices
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AD7982 Datasheet(HTML) 8 Page - Analog Devices
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Rev. A | Page 8 of 16
Integral Nonlinearity Error (INL)
Linearity error refers to the deviation of each individual code
from a line drawn from negative full scale through positive full
scale. The point used as negative full scale occurs ½ LSB before
the first code transition. Positive full scale is defined as a level
1½ LSB beyond the last code transition. The deviation is
measured from the middle of each code to the true straight line
(see Figure 21).
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. DNL is the
maximum deviation from this ideal value. It is often specified in
terms of resolution for which no missing codes are guaranteed.
Zero error is the difference between the ideal midscale voltage,
that is, 0 V, and the actual voltage producing the midscale
output code, that is, 0 LSB.
The first transition (from 100 . . . 00 to 100 . . . 01) should
occur at a level ½ LSB above the nominal negative full scale
(−4.999924 V for the ±5 V range). The last transition (from
011…10 to 011…11) should occur for an analog voltage
1½ LSB below the nominal full scale (4.999771 V for the ±5 V
range). The gain error is the deviation of the difference between
the actual level of the last transition and the actual level of the
first transition from the difference between the ideal levels.
Spurious-Free Dynamic Range (SFDR)
SFDR is the difference, in decibels (dB), between the rms
amplitude of the input signal and the peak spurious signal.
Effective Number of Bits (ENOB)
ENOB is a measurement of the resolution with a sine wave
input. It is related to SINAD by the following formula
ENOB = (SINAD
and is expressed in bits.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first five harmonic
components to the rms value of a full-scale input signal and is
expressed in dB.
Signal-to-Noise Ratio (SNR)
SNR is the ratio of the rms value of the actual input signal to the
rms sum of all other spectral components below the Nyquist
frequency, excluding harmonics and dc. The value for SNR is
expressed in dB.
Signal-to-(Noise + Distortion) Ratio (SINAD)
SINAD is the ratio of the rms value of the actual input signal to
the rms sum of all other spectral components below the Nyquist
frequency, including harmonics but excluding dc. The value for
SINAD is expressed in dB.
Aperture delay is a measure of the acquisition performance and
is the time between the falling edge of the CS input and when
the input signal is held for a conversion.
Transient response is the time required for the ADC to accurately
acquire its input after a full-scale step function is applied.
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