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Data Sheet

ADAS3023

TERMINOLOGY

Operating Input Voltage Range

Operating input voltage range is the maximum input voltage

range, including common-mode, which can be applied to the

input channels, IN0 to IN7, and COM.

Differential Input Voltage Range

Differential input voltage range is the maximum differential

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

selected programmable gain setting.

Channel Off Leakage

Channel off leakage is the leakage current with the channel

turned off.

Channel On Leakage

Channel on leakage is the leakage current with the channel

turned on.

Common-Mode Rejection Ratio (CMRR)

CMRR is computed as the ratio of the signal magnitude of the

converted result, referred to input, in the converted result to the

amplitude of the common modulation signal applied to an input

pair, expressed in decibels. CMRR is a measure of the ability of

the ADAS3023 to reject signals, such as power line noise, that are

common to the inputs. This specification is tested and specified

for all input channels, IN0 to IN7, with respect to COM.

Transient Response

Transient response is a measure of the time required for the

ADAS3023 to properly acquire the input after a full-scale step

function is applied to the system.

Least Significant Bit (LSB)

The 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 Error (INL)

INL refers to 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 (see Figure 37).

Differential Nonlinearity Error (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.

Offset Error

Ideally, the MSB transition occurs at an input level that is ½ LSB

above analog ground. The offset error is the deviation of the

actual transition from that point.

Gain Error

Ideally, 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 in LSB (or percentage of full-scale

range) of the actual level of the last transition from the ideal

level after the offset error is removed. Closely related is the full-

scale error (also in LSB or percentage of full-scale range), which

includes the effects of the offset error.

Aperture Delay

Aperture delay is the 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 to

the total rms noise measured with a −60 dBFS input signal applied

to the inputs. The value for 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 + 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.

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

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.

Rev. 0 | Page 17 of 32

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