AD4058BCPZ-R2 datasheet(17/66 Pages) AD

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Data Sheet

AD4052/AD4058

TERMINOLOGY

analog.com

Rev. B | 17 of 66

Integral Nonlinearity (INL) Error

INL is the deviation of each individual code from a line drawn from

the negative full scale through the positive full scale. The point

used as the negative full scale occurs ½ LSB before the first code

transition. The positive full scale is defined as a level 1½ LSB

beyond the last code transition. The deviation is measured from

each code center to the true straight line.

Differential Nonlinearity (DNL) Error

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.

Zero Error (ZE)

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

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

Gain Error (GE)

The first transition (from 100 ... 00 to 100 ... 01) occurs at a level

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

(from 011 … 10 to 011 … 11) 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.

Total Unadjusted Error (TUE)

TUE is the worst-case measured deviation from the ideal ADC

transfer function over the full input range, specified in ppm of

full-scale. TUE includes the combined effects of zero error, gain

error, and INL error for any given device.

Dynamic Range (DR)

Dynamic range is the RMS voltage of a full-scale sine wave to the

total RMS voltage of the noise measured. The value for dynamic

range is expressed in decibels. Dynamic range is measured with a

signal at −60 dBFS so that it includes all noise sources and DNL

artifacts.

Spurious-Free Dynamic Range (SFDR)

SFDR is the difference, in decibels (dB), between the RMS ampli-

tude of a full-scale input signal and the peak spurious signal.

Signal-to-Noise Ratio (SNR)

SNR is the ratio of the RMS voltage of a full-scale sine wave 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.

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 voltage of a full-scale sine wave 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.

Effective Number of Bits (ENOB)

ENOB is a measurement of the resolution with a sine wave input.

ENOB is related to SINAD as follows:

ENOB = (SINAD dB − 1.76)/6.02.

ENOB is expressed in bits.

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 −1 dBFS sine wave applied to the input

common-mode voltage of frequency, f.

CMRRdB =10×logPADC_IN/PADC_OUT

where:

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

the inputs.

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

Aperture Delay

Aperture delay is the time between the rising edge of the CNV input

and when the input signal is held for a conversion.

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