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AD9248BCP-65EBZ Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD9248BCP-65EBZ Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 48 page AD9248 Rev. B | Page 11 of 48 TERMINOLOGY Aperture Delay SHA performance measured from the rising edge of the clock input to when the input signal is held for conversion. Aperture Jitter The variation in aperture delay for successive samples, which is manifested as noise on the input to the ADC. Integral Nonlinearity (INL) 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 ½ LSB before the first code transition. Positive full scale is defined as a level 1½ LSB beyond the last code transition. The deviation is measured from the middle of each particular code to the true straight line. 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 16,384 codes must be present over all operating ranges. Offset Error The major carry transition should occur for an analog value ½ LSB below VIN+ = VIN−. Offset error is defined as the deviation of the actual transition from that point. Gain Error The first code transition should occur at an analog value ½ LSB above negative full scale. The last transition should occur at an analog value 1½ 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. Temperature Drift The temperature drift for zero error and gain error specifies the maximum change from the initial (25°C) value to the value at TMIN or TMAX. Power Supply Rejection The specification shows the maximum change in full scale from the value with the supply at the minimum limit to the value with the supply at its maximum limit. 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, expressed as a percentage or in decibels relative to the peak carrier signal (dBc). Signal-to-Noise and Distortion (SINAD) Ratio 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 SINAD is expressed dB. Effective Number of Bits (ENOB) Using the following formula ENOB = (SINAD − 1.76)/6.02 ENOB for a device for sine wave inputs at a given input frequency can be calculated directly from its measured SINAD. Signal-to-Noise Ratio (SNR) The ratio of the rms value of the measured input signal to the rms sum of all other spectral components below the Nyquist frequency, excluding the first six harmonics and dc. The value for SNR is expressed in dB. Spurious-Free Dynamic Range (SFDR) The difference in dB between the rms amplitude of the input signal and the peak spurious signal. 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. IF Sampling Due to the effects of aliasing, an ADC is not limited to Nyquist sampling. Higher sampled frequencies are aliased down into the first Nyquist zone (DC − fCLOCK/2) on the output of the ADC. The bandwidth of the sampled signal should not overlap Nyquist zones and alias onto itself. Nyquist sampling performance is limited by the bandwidth of the input SHA and clock jitter (jitter adds more noise at higher input frequencies). Two-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. Out-of-Range Recovery Time The time it takes for the ADC to reacquire the analog input after a transient 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. Crosstalk Coupling onto one channel being driven by a (−0.5 dBFS) signal when the adjacent interfering channel is driven by a full-scale signal. Measurement includes all spurs resulting from both direct coupling and mixing components. |
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