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AD7687BRMZ bảng dữ liệu(PDF) 11 Page - Analog Devices

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AD7687
Data Sheet
Rev. E | Page 10 of 26
TERMINOLOGY
Integral Nonlinearity Error (INL)
INL 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. Measure the deviation from the
middle of each code to the true straight line (see Figure 25).
Differential Nonlinearity Error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. The 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
Zero error is 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 (−4.999924 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 = (SINADdB − 1.76)/6.02
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
Dynamic range 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.
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
Aperture delay is the measure of the acquisition performance. It
is the time between the rising edge of the CNV input and when
the input signal is held for a conversion.
Transient Response
Transient response is the time required for the ADC to acquire its
input accurately after a full-scale step function is applied.


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Analog Devices
AD7687BRMZ AD-AD7687BRMZ Datasheet
469Kb / 28P
   16-Bit, 1.5 LSB INL, 250 kSPS PulSAR??Differential ADC in MSOP/QFN
REV. B
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Mô tả tương tự - AD7687BRMZ

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Analog Devices
AD7687BRMZ AD-AD7687BRMZ Datasheet
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