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AD7982 Datasheet(PDF) 8 Page - Analog Devices

Part No. AD7982
Description  18-bit, 1 MSPS PulSAR ADC in MSOP/QFN
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7982 Datasheet(HTML) 8 Page - Analog Devices

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AD7982
Preliminary Technical Data
Rev PrC | Page 8 of 23
TERMINOLOGY
Integral Nonlinearity Error (INL)
It 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 (Figure 12).
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
The difference between the ideal midscale voltage, that is, 0 V,
from the actual voltage producing the midscale output code,
that is, 0 LSB.
Gain Error
The first transition (from 100 . . . 00 to 100 . . . 01) should occur
at a level ½ LSB above nominal negative full scale (−4.999981 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 (+4.999943 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)
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 S/(N+D) by the following formula
ENOB = (S/[N + D]dB − 1.76)/6.02
and is expressed in bits.
Noise-free-code-resolution
It is the number of bits beyond which it is impossible to
distinctly resolve individual codes. It is calculated as :
Noise-Free Code resolution = log2(2N/peak-to-peak noise)
and is expressed in bits.
Effective resolution
It is calculated as :
Effective resolution = log2(2N/rms input noise)
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.
Dynamic Range
It is the ratio of the rms value of the full scale to the total rms
noise measured with the inputs shorted together. The value for
dynamic range is expressed in dB. It is measured with a signal at
-60dBFs to include all noise sources and DNL artifacts.
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 (S/[N+D])
S/(N+D) 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 S/(N+D) is expressed in dB.
Aperture Delay
The measure of the acquisition performance and is the time
between the rising edge of the CNV input and when the input
signal is held for a conversion.
Transient Response
The time required for the ADC to accurately acquire its input
after a full-scale step function was applied.


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