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AD9432BSTZ-801 Arkusz danych(PDF) 11 Page - Analog Devices |
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AD9432BSTZ-801 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 16 page AD9432 Rev. F | Page 11 of 16 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 a differential crossing of ENCODE and ENCODE and the instant at which the analog input is sampled. Aperture Uncertainty (Jitter) The sample-to-sample variation in aperture delay. Differential Nonlinearity (DNL) The deviation of any code from an ideal 1 LSB step. Effective Number of Bits (ENOB) The effective number of bits (ENOB) is calculated from the measured SNR based on the following equation: 02 . 6 log 20 dB 76 . 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − + − = Amplitude Input Amplitude Scale Full SNR ENOB MEASURED Encode Pulse Width/Duty Cycle Pulse width high is the minimum amount of time that the encode pulse should be left in the Logic 1 state to achieve the rated per- formance. Pulse width low is the minimum amount of time that the encode pulse should be left in the Logic 0 state. At a given clock rate, these specifications define an acceptable encode duty cycle. Harmonic Distortion The ratio of the rms signal amplitude fundamental frequency to the rms signal amplitude of a single harmonic component (second, third, and so on); reported in dBc. 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. Maximum Conversion Rate The maximum 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 a differential crossing of ENCODE and ENCODE and the time when all output data bits are within valid logic levels. Power Supply Rejection Ratio (PSRR) The ratio of a change in input offset voltage to a change in power supply voltage. Signal-to-Noise and Distortion (SINAD) Ratio 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. 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 com- ponents, excluding the first five harmonics and dc. 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 compo- nent may or may not be a harmonic. May be reported in dBc (degrades as signal level is lowered) or in dBFS (always related back to converter full scale). Two-Tone Intermodulation Distortion Rejection The ratio of the rms value of either input tone (f1, f2) to the rms value of the worst third-order intermodulation product; reported in dBc. Products are located at 2f1 − f2 and 2f2 − f1. Two-Tone SFDR The ratio of the rms value of either input tone (f1, f2) to the rms value of the peak spurious component. The peak spurious com- ponent may or may not be an IMD product. May be reported in dBc (degrades as signal level is lowered) or in dBFS (always related back to converter full scale). Worst Other Spur The ratio of the rms signal amplitude to the rms value of the worst spurious component (excluding the second-order and third-order harmonic); reported in dBc. |
Podobny numer części - AD9432BSTZ-801 |
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Podobny opis - AD9432BSTZ-801 |
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