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AD10242 Datasheet(PDF) 6 Page  Analog Devices 

AD10242 Datasheet(HTML) 6 Page  Analog Devices 
6 / 16 page AD10242 –6– REV. C Overvoltage Recovery Time The amount of time required for the converter to recover to 0.02% accuracy after an analog input signal of the specified percentage of full scale is reduced to midscale. Power Supply Rejection Ratio The ratio of a change in input 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 compo nents, including harmonics but excluding dc. SignaltoNoise Ratio (SNR, without Harmonics) 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 compo nents, excluding the first five harmonics and dc. SpuriousFree Dynamic Range (SFDR) The ratio of the rms signal amplitude to the rms value of the peak spurious spectral component. The peak spurious compo nent may or may not be a harmonic. SFDR may be reported in dBc (i.e., degrades as signal levels are lowered) or in dBFS (always related back to converter full scale). Transient Response The time required for the converter to achieve 0.02% accu racy when a onehalf fullscale step function is applied to the analog input. TwoTone Intermodulation Distortion Rejection The ratio of the rms value of either input tone to the rms value of the worst third order intermodulation product; reported in dBc. TwoTone 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. Twotone SFDR may be reported in dBc (i.e., degrades as signal levels are lowered) or in dBFS (always related back to converter full scale). 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 of 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 The deviation of any code from an ideal 1 LSB step. Encode Pulsewidth/Duty Cycle Pulsewidth high is the minimum amount of time that the ENCODE pulse should be left in Logic “1” state to achieve rated performance; pulsewidth 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. Harmonic Distortion The ratio of the rms signal amplitude to the rms value of the worst harmonic component. Integral Nonlinearity The deviation of the transfer function from a reference line measured in fractions of 1 LSB using a “best straight line” deter mined by a least square curve fit. 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. 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. 
