ADUC7023BCBZ62I-R7 datasheet(20/98 Pages) AD

20 / 98 page

ADuC7023

Data Sheet

Rev. H | Page 20 of 98

TERMINOLOGY

ADC SPECIFICATIONS

Integral Nonlinearity (INL)

The maximum deviation of any code from a straight line

passing through the endpoints of the ADC transfer function.

The endpoints of the transfer function are zero scale, a point

½ LSB below the first code transition, and full scale, a point

½ LSB above the last code transition.

Differential Nonlinearity (DNL)

The difference between the measured and the ideal 1 LSB

change between any two adjacent codes in the ADC.

Offset Error

The deviation of the first code transition (0000 . . . 000) to

(0000 . . . 001) from the ideal, that is, +½ LSB.

Gain Error

The deviation of the last code transition from the ideal AIN

voltage (full scale − 1.5 LSB) after the offset error has been

adjusted out.

Signal to (Noise + Distortion) Ratio

The measured ratio of signal to (noise + distortion) at the

output of the ADC. The signal is the rms amplitude of the

fundamental. Noise is the rms sum of all nonfundamental

signals up to half the sampling frequency (fS/2), excluding dc.

The ratio is dependent upon the number of quantization levels

in the digitization process; the more levels, the smaller the

quantization noise.

The theoretical signal to (noise + distortion) ratio for an ideal

N-bit converter with a sine wave input is given by

Signal to (Noise + Distortion) = (6.02 N + 1.76) dB

Thus, for a 12-bit converter, this is 74 dB.

Total Harmonic Distortion

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

DAC SPECIFICATIONS

Relative Accuracy

Otherwise known as endpoint linearity, relative accuracy is a

measure of the maximum deviation from a straight line passing

through the endpoints of the DAC transfer function. It is

measured after adjusting for zero error and full-scale error.

Voltage Output Settling Time

The amount of time it takes the output to settle to within a

1 LSB level for a full-scale input change.

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