ADAS3022BCPZ datasheet(20/40 Pages) AD

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ADAS3022

Data Sheet

Rev. A | Page 20 of 40

TERMINOLOGY

Operating Input Voltage Range

Operating input voltage range is the maximum input voltage

range, including the common-mode voltage, allowed on the

input channels IN[7:0] and COM.

Differential Input Voltage Range

Differential input voltage range is the maximum differential

full-scale input range. The value changes according to the

programmable gain setting.

Channel Off Leakage

Channel off leakage is the leakage current with the channel off.

Channel On Leakage

Channel on leakage is the leakage current with the channel on.

Charge Injection

Charge injection is a measure of the glitch impulse that is

transferred through the analog input pin into the source when

the sample is taken and/or the multiplexer is switched.

Common-Mode Rejection Ratio (CMRR)

CMRR is the ratio of the amplitude of a signal referred to input in

the converted result to the amplitude of the modulation common

to a pair of inputs and is expressed in decibels. CMRR is a measure

of the ability of the ADAS3022 to reject signals, such as power

line noise, that are common to the inputs. This specification is

for a 2 kHz sine wave of 20.48 V p-p applied to both channels of

an input pair.

Transient Response

Transient response is a measure of the time required for the

ADAS3022 to properly acquire the input after a full-scale step

function is applied to the system.

Least Significant Bit (LSB)

LSB is the smallest increment that can be represented by a

converter. For a fully differential input ADC with N bits of

resolution, the LSB expressed in volts is

REF

LSB

(V) =

Integral Nonlinearity (INL) Error

INL refers to the deviation of each individual code from a line

drawn from negative full scale to 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 53).

Differential Nonlinearity (DNL) Error

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.

Offset Error

Offset error is the deviation of the actual MSB transition from

the ideal MSB transition point. The ideal MSB transition occurs

at an input level ½ LSB above analog ground.

Gain Error

The last transition (from 111 … 10 to 111 … 11) for an analog

voltage should occur 1½ LSB below the nominal full scale. The

gain error is the deviation expressed in LSB (or as a percentage

of the full-scale range) of the actual level of the last transition

from the ideal level after the offset error is removed. Closely

related to this parameter is the full-scale error (also expressed in

LSB or as a percentage of the full-scale range), which includes

the effects of the offset error.

Total Unadjusted Error (TUE)

TUE is the deviation of each code from an ideal transfer function

and is a combination of all error contributors, including non-

linearity, offset error, and gain error. TUE for the ADAS3022 is

expressed as the maximum deviation in LSB or as a percentage

of the full-scale range.

Aperture Delay

Aperture delay is a measure of the acquisition performance. It is

the time between the rising edge of the CNV input and the point

at which the input signal is held for a conversion.

Dynamic Range

Dynamic range is the ratio of the rms value of the full-scale signal

to the total rms noise measured with the inputs shorted together.

The value for the dynamic range is expressed in decibels.

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 below the Nyquist

frequency, including harmonics but excluding dc. The value for

SINAD is expressed in decibels.

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