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AD9200KST Folha de dados(PDF) 7 Page - Analog Devices |
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AD9200KST Folha de dados(HTML) 7 Page - Analog Devices |
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7 / 25 page  AD9200 –6– REV. E DEFINITIONS OF SPECIFICATIONS Integral Nonlinearity (INL) Integral nonlinearity refers to the deviation of each individual code from a line drawn from “zero” through “full scale”. The point used as “zero” occurs 1/2 LSB before the first code transi- tion. “Full scale” is defined as a level 1 1/2 LSB beyond the last code transition. The deviation is measured from the center of each particular code to the true straight line. Differential Nonlinearity (DNL, No Missing Codes) An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. It is often specified in terms of the resolution for which no missing codes (NMC) are guaranteed. Typical Characterization Curves CODE OFFSET 1.0 0.5 –1.0 0 1024 128 256 384 512 640 768 896 0 –0.5 Figure 3. Typical DNL CODE OFFSET 1.0 0.5 –1.0 0 1024 128 256 384 512 640 768 896 0 –0.5 Figure 4. Typical INL Offset Error The first transition should occur at a level 1 LSB above “zero.” Offset is defined as the deviation of the actual first code transi- tion from that point. Gain Error The first code transition should occur for an analog value 1 LSB above nominal negative full scale. The last transition should occur for an analog value 1 LSB below the nominal positive full scale. Gain error is the deviation of the actual difference be- tween first and last code transitions and the ideal difference between the first and last code transitions. Pipeline Delay (Latency) The number of clock cycles between conversion initiation and the associated output data being made available. New output data is provided every rising edge. INPUT FREQUENCY – Hz 60 55 20 1.00E+05 1.00E+08 1.00E+06 1.00E+07 50 45 25 40 35 30 –0.5 AMPLITUDE –6.0 AMPLITUDE –20.0 AMPLITUDE Figure 5. SNR vs. Input Frequency 60 55 20 1.00E+05 1.00E+08 1.00E+06 1.00E+07 50 45 25 40 35 30 –0.5 AMPLITUDE –6.0 AMPLITUDE –20.0 AMPLITUDE INPUT FREQUENCY – Hz Figure 6. SINAD vs. Input Frequency (AVDD = +3 V, DRVDD = +3 V, FS = 20 MHz (50% Duty Cycle), MODE = AVDD, 2 V Input Span from 0.5 V to 2.5 V, External Reference, unless otherwise noted) |
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Descrição semelhante - AD9200KST |
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