AD7762 datasheet(9/28 Pages) AD

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AD7762

Rev. 0 | Page 9 of 28

TERMINOLOGY

Differential Nonlinearity (DNL)

The difference between the measured and the ideal 1-LSB

change between any two adjacent codes in the ADC.

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.

Zero Error

The zero error is the difference between the ideal midscale

input voltage (0 V) and the actual voltage producing the

midscale output code.

Total Harmonic Distortion (THD)

The ratio of the rms sum of harmonics to the fundamental. For

the AD7762, it is defined as

Zero Error Drift

The change in the actual zero error value due to a temperature

change of 1°C. It is expressed as a percentage of the zero error at

room temperature.

()

THD

log

where:

Gain Error

The first transition (from 100…000 to 100…001) should occur

for an analog voltage 1/2 LSB above the nominal negative full

scale. The last transition (from 011…110 to 011…111) should

occur for an analog voltage 1 1/2 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.

is the rms amplitude of the fundamental.

V2, V3, V4, V5

,.and V6 are the rms amplitudes of the second to

the sixth harmonics.

Nonharmonic Spurious-Free Dynamic Range (SFDR)

The ratio of the rms signal amplitude to the rms value of the

peak spurious spectral component, excluding harmonics.

Dynamic Range

Dynamic range is the ratio of the rms value of the full scale to

the rms noise measured with the inputs shorted together. The

value for dynamic range is expressed in decibels.

Gain Error Drift

The change in the actual gain error value due to a temperature

change of 1°C. It is expressed as a percentage of the gain error at

room temperature.

Integral Nonlinearity (INL)

The maximum deviation from a straight line passing through

the endpoints of the ADC transfer function.

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