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AD1671KP Datasheet(PDF) 6 Page - Analog Devices |
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AD1671KP Datasheet(HTML) 6 Page - Analog Devices |
6 / 16 page AD1671 REV. B –6– DEFINITIONS OF SPECIFICATIONS INTEGRAL NONLINEARITY (INL) Integral nonlinearity refers to the deviation of each individual code from a line drawn from “zero” through “full scale.” The point used as “zero” occurs 1/2 LSB (1.22 mV for a 10 V span) before the first code transition (all zeros to only the LSB on). “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 low side transition of each particular code to the true straight line. DIFFERENTIAL LINEARITY ERROR (NO MISSING CODES) An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from the ideal value. Thus every code has a finite width. Guaranteed no missing codes to 11- or 12-bit resolution indicates that all 2048 and 4096 codes, respec- tively, must be present over all operating ranges. No missing codes to 11 bits (in the case of a 12-bit resolution ADC) also means that no two consecutive codes are missing. UNIPOLAR OFFSET The first transition should occur at a level 1/2 LSB above analog common. Unipolar offset is defined as the deviation of the ac- tual from that point. This offset can be adjusted as discussed later. The unipolar offset temperature coefficient specifies the maximum change of the transition point over temperature, with or without external adjustments. BIPOLAR ZERO In the bipolar mode the major carry transition (0111 1111 1111 to 1000 0000 0000) should occur for an analog value 1/2 LSB be- low analog common. The bipolar offset error and temperature coefficient specify the initial deviation and maximum change in the error over temperature. GAIN ERROR The last transition (from 1111 1111 1110 to 1111 1111 1111) should occur for an analog value 1 1/2 LSB below the nominal full scale (4.9963 volts for 5.000 volts full scale). The gain error is the deviation of the actual level at the last transition from the ideal level. The gain error can be adjusted to zero as shown in Figures 4 through 7. TEMPERATURE COEFFICIENTS The temperature coefficients for unipolar offset, bipolar zero and gain error specify the maximum change from the initial (+25 °C) value to the value at T MIN or TMAX. 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 full-scale change from the initial value with the supplies at the various limits. DYNAMIC SPECIFICATIONS SIGNAL-TO-NOISE PLUS 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, including har- monics but excluding dc. The value for S/N+D is expressed in decibels. EFFECTIVE NUMBER OF BITS (ENOB) ENOB is calculated from the expression (S/N+D) = 6.02N + 1.76 dB, where N is equal to the effective number of bits. 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 ex- pressed 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 or- der terms are (2 fa + fb), (2 fa – fb), (fa + 2 fb) and (2fb – 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 sum is –0.5 dB from full scale. The IMD products are normalized to a 0 dB input signal. PEAK SPURIOUS OR PEAK HARMONIC COMPONENT The peak spurious or peak harmonic component is the largest spectral component, excluding the input signal and dc. This value is expressed in decibels relative to the rms value of a full- scale input signal. APERTURE DELAY Aperture delay is the difference between thc switch delay and the analog delay of the SHA. This delay represents the point in time, relative to the rising edge of ENCODE input, that the analog input is sampled. APERTURE JITTER Aperture jitter is the variation in aperture delay for successive samples. FULL POWER BANDWIDTH The input frequency at which the amplitude of the recon- structed fundamental is reduced by 3 dB for a full-scale input. |
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