AD7380 datasheet(13/31 Pages) AD

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Data Sheet

AD7381-4

Rev. 0 | Page 13 of 31

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 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 (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 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

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.

CMRR is expressed in decibels.

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 each ADC channel.

Aperture Jitter

Aperture jitter is the variation in aperture delay.

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