AD7380 datasheet(14/33 Pages) AD

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Data Sheet

AD7383-4/AD7384-4

TERMINOLOGY

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Rev. 0 | 14 of 33

Differential Nonlinearity (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.

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 Drift

The gain error change due to a temperature change of 1°C.

Gain Error Matching

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.

Zero Error

Zero error is the difference between the ideal midscale voltage, 0 V,

and the actual voltage producing the midscale output code, 0 LSB.

Zero Error Temperature Drift

Zero error temperature drift is the zero error change due to a

temperature change of 1°C.

Zero Error Match

Zero 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 decibels.

Spurious-Free Dynamic Range (SFDR)

SFDR is the difference, in decibels, 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 compo-

nents to the RMS value of a full-scale input signal and is expressed

in decibels.

Signal-to-Noise and Distortion (SINAD) Ratio

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 decibels.

Common-Mode Rejection Ratio (CMRR)

CMRR is the ratio of the power in the ADC output at the frequen-

cy, f, to the power of a 200 mV p-p sine wave applied to the

common-mode voltage of AINx+ and AINx− of f. CMRR is expressed

in decibels.

CMRR=10logPADC_IN/PADC_OUT

where:

PADC_IN is the common-mode power at the f applied to the AINx+

and AINx− inputs.

PADC_OUT is the power at the 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 Jitter

Aperture jitter is the variation in aperture delay.

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