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AD9244BST-40 Folha de dados(PDF) 8 Page - Analog Devices |
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AD9244BST-40 Folha de dados(HTML) 8 Page - Analog Devices |
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8 / 36 page  REV. A –8– AD9244 TERMINOLOGY Analog Bandwidth (Full Power Bandwidth) The analog input frequency at which the spectral power of the fundamental frequency (as determined by the FFT analysis) is reduced by 3 dB. Aperture Delay The delay between the 50% point of the rising edge of the clock and the instant at which the analog input is sampled. Aperture Uncertainty (Jitter) The sample-to-sample variation in aperture delay. Differential Analog Input Voltage Range The peak-to-peak differential voltage must be applied to the converter to generate a full-scale response. Peak differential voltage is computed by observing the voltage on a single pin and subtracting the voltage from the other pin, which is 180 degrees out of phase. Peak-to-peak differential is computed by rotating the input phase 180 ° and taking the peak measurement again. Then the difference is found between the two peak measurements. Differential Nonlinearity (DNL, No Missing Codes) An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. Guaranteed no missing codes to 14-bit resolution indicates that all 16384 codes must be present over all operating ranges. Dual Tone SFDR * The ratio of the rms value of either input tone to the rms value of the peak spurious component. The peak spurious component may or may not be an IMD product. Effective Number of Bits (ENOB) The effective number of bits for a device for sine wave inputs at a given input frequency can be calculated directly from its mea- sured SINAD using the following formula: N SINAD = () – ./ . 176 602 Gain Error The first code transition should occur at an analog value 1/2 LSB above negative full scale. The last code transition should occur at 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. Common-Mode Rejection Ratio (CMRR) Common-mode (CM) signals appearing on VIN+ and VIN– are ideally rejected by the differential front end of the ADC. With a full-scale CM signal driving both VIN+ and VIN–, CMRR is the ratio of the amplitude of the full-scale input CM signal to the amplitude of signal that is not rejected, expressed in dBFS. IF Sampling Due to the effects of aliasing, an ADC is not necessarily limited to Nyquist sampling. Higher sampled frequencies will be aliased down into the first Nyquist zone (DC–fCLOCK/2) on the output of the ADC. Care must be taken that the bandwidth of the sampled signal does not overlap Nyquist zones and alias onto itself. Nyquist sampling performance is limited by the band- width of the input SHA and clock jitter (noise caused by jitter increases as the input frequency increases). Integral Nonlinearity (INL) INL 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. Positive full scale is defined as a level 1 1/2 LSB beyond the last code transition. The deviation is measured from the middle of each particular code to the true straight line. Minimum Conversion Rate The clock rate at which the SNR of the lowest analog signal frequency drops by no more than 3 dB below the guaranteed limit. Maximum Conversion Rate The clock rate at which parametric testing is performed. Nyquist Sampling When the frequency components of the analog input are below the Nyquist frequency (fCLOCK/2), this is often referred to as Nyquist sampling. Out-of-Range Recovery Time The time it takes for the ADC to reacquire the analog input after a transition from 10% above positive full scale to 10% above negative full scale, or from 10% below negative full scale to 10% below positive full scale. Power Supply Rejection Ratio The change in full scale from the value with the supply at its minimum limit to the value with the supply at its maximum limit. Signal-to-Noise-and-Distortion (SINAD) * The ratio of the rms signal amplitude to the rms value of the sum of all other spectral components below the Nyquist fre- quency, including harmonics but excluding dc. Signal-to-Noise Ratio (SNR) * The ratio of the rms signal amplitude to the rms value of the sum of all other spectral components below the Nyquist fre- quency, excluding the first six harmonics and dc. Spurious-Free Dynamic Range (SFDR) * The difference in dB between the rms amplitude of the input signal and the peak spurious signal. Temperature Drift The temperature drift for offset error and gain error specifies the maximum change from the initial (25 °C) value to the value at TMIN or TMAX. Total Harmonic Distortion (THD) * The ratio of the rms sum of the first six harmonic components to the rms value of the measured input signal. Offset Error The major carry transition should occur for an analog value 1/2 LSB below VIN+ = VIN–. Offset error is defined as the deviation of the actual transition from that point. *AC specifications may be reported in dBc (degrades as signal levels are lowered) or in dBFS (always related back to converter full scale). |
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Descrição semelhante - AD9244BST-40 |
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