AD822 datasheet(11/88 Pages) AD

11 / 88 page

ADuC841/ADuC842/ADuC843

Rev. 0 | Page 11 of 88

TERMINOLOGY

ADC SPECIFICATIONS

Integral Nonlinearity

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

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, i.e., +½ LSB.

Gain Error

The deviation of the last code transition from the ideal AIN

voltage (Full Scale – ½ 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 depends on 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) = (6.02N + 1.76) dB

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

Total Harmonic Distortion (THD)

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

DAC SPECIFICATIONS

Relative Accuracy

Relative accuracy or endpoint linearity 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 for the output to settle to a

specified level for a full-scale input change.

Digital-to-Analog Glitch Impulse

The amount of charge injected into the analog output when the

inputs change state. It is specified as the area of the glitch in nV-sec.

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