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ADUC843BS62-3 Datasheet(PDF) 11 Page - Analog Devices |
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ADUC843BS62-3 Datasheet(HTML) 11 Page - Analog Devices |
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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