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AD1672 Datasheet(PDF) 6 Page - Analog Devices |
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AD1672 Datasheet(HTML) 6 Page - Analog Devices |
6 / 20 page AD1672 REV. 0 –6– DEFINITIONS OF SPECIFICATIONS INTEGRAL NONLINEARITY ERROR (INL) Integral nonlinearity error 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 1/2 LSB before the first code transition (all zeros to only the LSB on). “Positive full scale” is defined as a level 1 1/2 LSB beyond the last code transition (to all ones). The deviation is measured from the middle of each particular code to the true straight line. DIFFERENTIAL LINEARITY ERROR (DNL, NO MISSING CODES) An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. Thus every code must have a finite width. Guaranteed no missing codes to 12-bit resolution indicates that all 4096 codes must be present over all operating ranges. UNIPOLAR OFFSET ERROR In the unipolar mode, the first transition should occur at a level 1/2 LSB above analog common. Unipolar offset is defines as the deviation of the actual from that point. BIPOLAR ZERO ERROR In the bipolar mode, the major carry transition should occur for an analog value 1/2 LSB below analog common. Zero error is defined as the deviation of the actual transition from that point. GAIN ERROR The first transition should occur for an analog value 1/2 LSB above nominal negative full scale. The last transition should occur for an analog value 1 1/2 LSB below the nominal full scale. Gain error is the deviation of the actual difference between first and last code transitions and the ideal difference between first and last code transitions. POWER SUPPLY REJECTION One of the effects of power supply error on the performance of the device will be a small change in gain. The specifications show the maximum change in the converter’s full scale as the supplies are varied from minimum to maximum values. APERTURE JITTER Aperture jitter is the variation in aperture delay for successive samples and is manifested as noise on the input to the A/D. CODE TRANSITION NOISE The effects of noise are to introduce an uncertainty in the pre- cise determination of the analog input values at which the out- put code transitions take place, and, in effect, to increase or reduce the quantization band. Code transition noise describes the quantization band variation resulting from noise in terms of rms LSBs. APERTURE DELAY Aperture delay is a measure of the Sample-and-Hold (SHA) performance and is measured from the rising edge of the clock input to when the input signal is held for conversion. OVERVOLTAGE RECOVERY TIME Overvoltage recovery time is defined as that amount of time required for the ADC to achieve a specified accuracy after an overvoltage (50% greater than full-scale range), measured from the time the overvoltage signal reenters the converter’s range. DYNAMIC SPECIFICATIONS SIGNAL-TO-NOISE AND DISTORTION (S/N+D) RATIO S/N+D is the ratio of the rms value of the measured input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for S/N+D is expressed in decibels. TOTAL HARMONIC DISTORTION (THD) THD is the ratio of the rms sum of the first six harmonic com- ponents to the rms value of the measured input signal and is expressed as a percentage or in decibels. INTERMODULATION DISTORTION (IMD) With inputs consisting of sine waves at two frequencies, fa and fb, any device with nonlinearities will create distortion products, of order (m + n), at sum and difference frequencies of mfa ± nfb, where m, n = 0, 1, 2, 3. . . . Intermodulation terms are those for which m or n is not equal to zero. For example, the second order terms are (fa + fb) and (fa – fb) and the third order terms are (2 fa + fb), (2 fa – fb), (fa + 2fb) and (2 fb – fa). The IMD products are expressed as the decibel ratio of the rms sum of the measured input signals to the rms sum of the distor- tion terms. The two signals are of equal amplitude and the peak value of their sums is –0.5 dB from full-scale. The IMD prod- ucts are normalized to a 0 dB input signal. FULL-POWER BANDWIDTH The full-power bandwidth is that input frequency at which the amplitude of the reconstructed fundamental is reduced by 3 dB for a full-scale input. SPURIOUS FREE DYNAMIC RANGE The difference, in dB, between the rms amplitude of the input signal and the peak spurious signal. |
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