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AD4000 Datasheet(PDF) 16 Page - Analog Devices

Part # AD4000
Description  Precision, Pseudo Differential, SAR ADCs
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD4000 Datasheet(HTML) 16 Page - Analog Devices

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Data Sheet
Rev. C | Page 16 of 36
Integral Nonlinearity Error (INL)
INL is 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 32).
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
Zero error is the difference between the ideal voltage that
results in the first code transition (½ LSB above analog ground)
and the actual voltage producing that code.
Gain Error
The first transition (from 100 ... 00 to 100 ... 01) occurs 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)
occurs 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)
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 as follows:
ENOB = (SINADdB − 1.76)/6.02
ENOB 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 decibels.
Dynamic Range
Dynamic range is the ratio of the rms value of the full scale to
the total rms noise measured. The value for dynamic range is
expressed in decibels. It is measured with a signal at −60 dBFS
so that it includes 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 decibels.
Signal-to-Noise-and-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 that are less than
the Nyquist frequency, including harmonics but excluding dc.
The value of SINAD is expressed in decibels.
Aperture Delay
Aperture delay is 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
Transient response is the time required for the ADC to acquire a
full-scale input step to ±0.5 LSB accuracy.
Power Supply Rejection Ratio (PSRR)
PSRR is the ratio of the power in the ADC output at the
frequency, f, to the power of a 200 mV p-p sine wave applied to
the ADC VDD supply of frequency, f.
PSRR (dB) = 10 log(PVDD_IN/PADC_OUT)
PVDD_IN is the power at the frequency, f, at the VDD pin.
PADC_OUT is the power at the frequency, f, in the ADC output.

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