AD4682 datasheet(13/30 Pages) AD

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Data Sheet

AD4682/AD4683

Rev. 0 | Page 13 of 30

TERMINOLOGY

Differential Nonlinearity (DNL)

In an ideal ADC, code transitions are 1 LSB apart. DNL is the

maximum deviation from this ideal value. DNL is often specified

in terms of resolution for which no missing codes are guaranteed.

Integral Nonlinearity (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.

Gain Error

The first transition (from 100 … 000 to 100 … 001) occurs at a

level ½ LSB above nominal negative full scale. The last transition

(from 011 … 110 to 011 … 111) occurs for an analog voltage

1½ LSB below the nominal full scale. 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.

Gain Error Temperature Drift

Gain error temperature drift is the gain error change due to a

temperature change of 1°C.

Gain Error Match

Gain error matching is the difference in negative full-scale error

between the input channels and the difference in positive full-scale

error between the input channels.

Offset Error

Offset error is the difference between the ideal midscale voltage,

0 V, and the actual voltage producing the midscale output code,

0 LSB.

Offset Temperature Drift

Offset temperature drift is the zero error change due to a

temperature change of 1°C.

Offset Error Match

Offset error match is the difference in zero error between the

input channels.

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.

Spurious-Free Dynamic Range (SFDR)

SFDR is the difference, in dB, between the rms amplitude of the

input signal and the peak spurious signal.

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-and-Distortion (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 for SINAD is expressed in dB.

Common-Mode Rejection Ratio (CMRR)

CMRR 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 common-mode voltage of AINx+ and AINx− of frequency, f.

The value for CMRR is expressed in dB.

CMRR = 10log(PADC_IN/PADC_OUT)

where:

PADC_IN is the common-mode power at the frequency, f, applied

to the AINx+ and AINx− inputs.

PADC_OUT is the power at the frequency, f, in the ADC output.

Aperture Delay

Aperture delay is the 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.

Aperture Delay Match

Aperture delay match is the difference of the aperture delay

between ADC A and ADC B.

Aperture Jitter

Aperture jitter is the variation in aperture delay.

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