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AD10678 Fiches technique(PDF) 12 Page  Analog Devices 

AD10678 Fiches technique(HTML) 12 Page  Analog Devices 
12 / 20 page AD10678 Rev. C  Page 12 of 20 TERMINOLOGY 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 sampletosample variation in aperture delay. Differential Nonlinearity (DNL) The deviation of any code from an ideal 1 LSB step. Encode Pulse Width/Duty Cycle Pulse width high is the minimum amount of time that the encode pulse should be left in Logic 1 state to achieve rated performance; pulse width low is the minimum time that the encode pulse should be left in low state. At a given clock rate, these specifications define an acceptable encode duty cycle. Integral Nonlinearity (INL) 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. Harmonic Distortion The ratio of the rms signal amplitude to the rms value of the worst harmonic component. Maximum Conversion Rate The encode rate at which parametric testing is performed. Minimum Conversion Rate The encode rate at which the SNR of the lowest analog signal frequency drops by no more than 3 dB below the guaranteed limit. 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 (PSRR) The ratio of a change in output offset voltage to a change in power supply voltage. SignaltoNoise 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. Can be reported in dBc (that is, degrades as signal level is lowered) or in dBFS (always related back to converter full scale). SignaltoNoise 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. Can be reported in dBc (that is, degrades as signal level is lowered) or in dBFS (always related back to converter full scale). SpuriousFree 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 an harmonic. Can be reported in dBc (such as, degrades as signal level is lowered) or in dBFS (always related back to converter full scale). TwoTone Intermodulation Distortion Rejection (IMD) Ratio of the rms value of either input tone to the rms value of the worst thirdorder intermodulation product; reported in dBc. Voltage StandingWave Ratio (VSWR) The ratio of the amplitude of the elective field at a voltage maximum to that at an adjacent voltage minimum. 
