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AD9022SQ Arkusz danych(PDF) 5 Page - Analog Devices |
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AD9022SQ Arkusz danych(HTML) 5 Page - Analog Devices |
5 / 12 page AD9022 REV. B –5– DEFINITIONS OF SPECIFICATIONS Analog Bandwidth The analog input frequency at which the spectral power of the fundamental frequency (as determined by FFT analysis) is reduced by 3 dB. Aperture Delay The delay between 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. Harmonic Distortion The rms value of the fundamental divided by 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” de- termined by a least square curve fit. Minimum Conversion Rate The encode rate at which the SNR of the lowest analog signal frequency tested drops by no more than 3 dB below the guaran- teed 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 EN- CODE command and the time when all output data bits are within valid logic levels. Overvoltage Recovery Time The amount of time required for the converter to recover to 12-bit accuracy after an analog input signal 150% of full scale is reduced to the full-scale range of the converter. Power Supply Rejection Ratio (PSRR) The ratio of a change in input offset voltage to a change in power supply voltage. Signal-to-Noise Ratio (SNR) The ratio of the rms signal amplitude to the rms value of “noise,” which is defined as the sum of all other spectral compo- nents, including harmonics but excluding dc, with an analog input signal 1 dB below full scale. Signal-to-Noise Ratio (Without Harmonics) The ratio of the rms signal amplitude to the rms value of “noise,” which is defined as the sum of all other spectral compo- nents, excluding the first five harmonics and dc, with an analog input signal 1 dB below full scale. Transient Response The time required for the converter to achieve 12-bit accuracy when a step function is applied to the analog input. Two-Tone Intermodulation Distortion (IMD) Rejection The ratio of the power of either of two input signals to the power of the strongest third-order IMD signal. ANALOG INPUT –VS +VS +VS 180 120 10pF Encode Input 11k 12k –VS DIGITAL OUTPUT +VS Analog Input Output Stage –VS 100 900 +VS ENCODE Compensation 20pF 50 COMPENSATION –VS –VS Figure 1. Equivalent Circuits |
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