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AD9281ARSZ Datasheet(PDF) 11 Page - Analog Devices |
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AD9281ARSZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 15 page AD9281 –11– QREFT QREFB IREFT 0.1 F10 F 0.1 F 0.1 F AD9281 REFSENSE AVSS 1V 0.1 F 10 F IREFB VREF 0.1 F 0.1 F 10k 10k ADC CORE INTERNAL CONTROL LOGIC 0.1 F 1.0 F Figure 26. Reference Buffer Equivalent Circuit and External Decoupling Recommendation For best results in both noise suppression and robustness against crosstalk, the 4-capacitor buffer decoupling arrangement shown in Figure 26 is recommended. This decoupling should –3 –0.5 –13 –23 –33 –43 –53 –63 –73 0 0.5 1 1.5 CML – V 2V 1V a. Differential Input, 3 V Supplies –35 –0.5 –40 –45 –50 –55 –60 –65 –70 0 0.5 1 1.5 CML – V 2 2.5 1V 2V b. Differential Input, 5 V Supplies Figure 27. THD vs. CML Input Span and Power Supply (Analog Input = 1 MHz) –15 –0.5 –25 –35 –45 –55 –65 0 0.5 1 1.5 CML – V 2V 1V c. Single-Ended Input, 3 V Supplies –15 –0.5 –25 –35 –45 –55 –65 0 0.5 1 1.5 CML – V 2V 1V 2 2.5 d. Single-Ended Input, 5 V Supplies feature chip capacitors located close to the converter IC. The capacitors are connected to either IREFT/IREFB or QREFT/ QREFB. A connection to both sides is not required. COMMON-MODE PERFORMANCE Attention to the common-mode point of the analog input volt- age can improve the performance of the AD9281. Figure 27 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 AD9281 running with AVDD = 5 V is the easiest to drive. 2. Differential inputs are the most insensitive to common-mode voltage. 3. An AD9281 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. REV. F |
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