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AD9040A Arkusz danych(PDF) 5 Page - Analog Devices |
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AD9040A Arkusz danych(HTML) 5 Page - Analog Devices |
5 / 12 page AD9040A 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 Gain The percentage of amplitude change of a small high frequency sine wave (3.58 MHz) superimposed on a low frequency signal (15.734 kHz). Differential Nonlinearity The deviation of any code from an ideal 1 LSB step. Differential Phase The phase change of a small high frequency sine wave (3.58 MHz) superimposed on a low frequency signal (15.734 kHz). Harmonic Distortion The rms value of the fundamental divided by the rms value of the harmonic. 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 falling edge of the ENCODE command and the 1 V/4 V points of output data. Overvoltage Recovery Time The amount of time required for the converter to recover to 10-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 com- ponents, 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 com- ponents, excluding the first eight harmonics and dc, with an analog input signal 1 dB below full scale. Transient Response The time required for the converter to achieve 10-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. VCC VSS AIN 2k 1k 1mA 1mA 1k ANALOG INPUT VCC VREF GND 6.8k RL 2.5k VSS BPREF REFERENCE CIRCUIT VCC VOUT RL GND BANDGAP OUTPUT VCC GND D0-9 CMOS OUTPUT 1k 1k Figure 2. Equivalent Circuits |
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