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AD9201ARS Arkusz danych(PDF) 12 Page - Analog Devices |
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AD9201ARS Arkusz danych(HTML) 12 Page - Analog Devices |
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12 / 20 page ![]() AD9201 –12– REV. D COMMON-MODE LEVEL – V –30 –35 –80 –0.5 1.5 0 0.5 1.0 –50 –65 –70 –75 –40 –45 –60 –55 1V SPAN 2V SPAN a. Differential Input, 3 V Supplies COMMON-MODE LEVEL – V –30 –35 –80 –0.5 2.5 0 0.5 1.0 –50 –65 –70 –75 –40 –45 –60 –55 1.5 2.0 1V SPAN 2V SPAN b. Differential Input, 5 V Supplies COMMON-MODE LEVEL – V –10 –80 –0.5 0 0.5 1.0 –40 –60 –70 –20 –30 –50 1.5 1V SPAN 2V SPAN c. Single-Ended Input, 3 V Supplies COMMON-MODE LEVEL – V –10 –80 –0.5 2.5 0 0.5 1.0 –40 –60 –70 –20 –30 –50 1.5 2.0 1V SPAN 2V SPAN d. Single-Ended Input, 5 V Supplies Figure 29. THD vs. CML Input Span and Power Supply (Analog Input = 1 MHz) COMMON-MODE PERFORMANCE Attention to the common-mode point of the analog input volt- age can improve the performance of the AD9201. Figure 29 illustrates THD as a function of common-mode voltage (center point of the analog input span) and power supply. Inspection of the curves will yield the following conclusions: 1. An AD9201 running with AVDD = 5 V is the easiest to drive. 2. Differential inputs are the most insensitive to common-mode voltage. 3. An AD9201 powered by AVDD = 3 V and a single ended input, should have a 1 V span with a common-mode voltage of 0.75 V. |
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