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AD10677BWS Folha de dados(PDF) 11 Page - Analog Devices |
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AD10677BWS Folha de dados(HTML) 11 Page - Analog Devices |
11 / 10 page AD10677 Rev. B | Page 11 of 20 FUNDAMENTAL LEVEL (dBFS) –80 –70 –60 –50 –40 –30 –20 –10 0 0 10 20 30 40 50 60 70 80 90 100 SFDR 30MHz SNR 30MHz SFDR 10MHz SNR 10MHz SFDR 2.5MHz SNR 2.5MHz Figure 13. SFDR and SNR vs. Analog Input Level ANALOG INPUT FREQUENCY (MHz) 76 78 80 82 84 86 88 90 92 94 96 SNR SFDR 0 1015 20 2530 35 5 Figure 14. SFDR and SNR vs. Analog Input Frequency DEFINITION OF SPECIFICATIONS Analog 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 on the rising edge of the ENCODE command and the instant at which the analog input is sampled. Aperture Uncertainty (Jitter) The sample-to-sample variation in aperture delay. Differential Nonlinearity The deviation of any code from an ideal 1 LSB step. Integral Nonlinearity The deviation of the transfer function from a reference line measured in fractions of 1 LSB using a best straight line determined by a least square curve fit. Encode Pulse Width/Duty Cycle Pulse width high is the minimum amount of time the ENCODE pulse should be left in a Logic 1 state to achieve rated performance; pulse width low is the minimum time the ENCODE pulse should be left in a low state. At a given clock rate, these specifications define an acceptable encode duty cycle. Harmonic Distortion The ratio of the rms signal amplitude to the rms value of the worst harmonic component. Minimum Conversion Rate The encode rate when the SNR of the lowest analog signal frequency drops by3 dB or less below the guaranteed limit. Maximum Conversion Rate The encode rate at which parametric testing is performed. Output Propagation Delay The delay between the 50% point of the rising edge of the ENCODE command and the time when all output data bits are within valid logic levels. Power Supply Rejection Ratio The ratio of a change in output offset voltage to a change in power supply voltage. Signal-to-Noise-and-Distortion (SINAD) The ratio of the rms signal amplitude (set at 1 dB below full scale) to the rms value of the sum of all other spectral components, including the first five harmonics and dc. May be reported in dBc (i.e., degrades as signal levels is lowered) or in dBFS (always related back to converter full scale). Signal-to-Noise Ratio (SNR) The ratio of the rms signal amplitude (set at 1 dB below full scale) to the rms value of the sum of all other spectral components, excluding the first five harmonics and dc. May be reported in dBc (i.e., degrades as the signal level is lowered) or in dBFS (always related back to converter full scale). Spurious-Free Dynamic Range (SFDR) The ratio of the rms signal amplitude to the rms value of the peak spurious spectral component. The peak spurious component may or may not be a harmonic. SFDR may be reported in dBc (i.e., degrades as signal level is lowered) or in dBFS (always related back to converter full scale). Two-Tone Intermodulation Distortion Rejection (IMD) The ratio of the rms value of an input tone to the rms value of the worst third-order intermodulation product; reported in dBc. Voltage Standing-Wave Ratio (VSWR) The ratio of the amplitude of the elective field at a voltage maximum to that at an adjacent voltage minimum. |
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