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AD9694 Datasheet(PDF) 18 Page - Analog Devices |
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AD9694 Datasheet(HTML) 18 Page - Analog Devices |
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18 / 101 page  AD9694 Data Sheet Rev. 0 | Page 18 of 101 –160 –140 –120 –100 –80 –60 –40 –20 0 FREQUENCY (MHz) AIN = –1dBFS SNRFS = 71.80dB SFDR = 98.27dBFS –31.25 –21.25 –11.25 –1.25 8.75 18.75 28.75 Figure 30. DDC Mode (4 DDCs; Decimate by 8; L = 1, M = 4, and F = 8) with fIN = 305 MHz –160 –140 –120 –100 –80 –60 –40 –20 0 FREQUENCY (MHz) AIN = –1dBFS SNRFS = 74.50dB SFDR = 100.68dBFS –15.625 –10.625 –5.625 –0.625 4.375 9.375 14.375 Figure 31. DDC Mode (4 DDCs, Decimate by 16, L = 1, M = 4, and F = 8) with fIN = 305 MHz 65.5 65.6 65.7 65.8 65.9 66.0 66.1 66.2 66.3 66.4 66.5 66.6 66.7 66.8 66.9 67.0 DIFFERENTIAL VOLTAGE (V) Figure 32. SNR vs. Differential Voltage (Clock Amplitude), fIN = 155.3 MHz –95 –94 –93 –92 –91 –90 –89 –88 –87 –86 –85 –84 –83 –82 –81 –80 –79 –78 –77 –76 –75 ANALOG INPUT FREQUENCY (MHz) BUFFER CURRENT = 160µA BUFFER CURRENT = 200µA BUFFER CURRENT = 240µA BUFFER CURRENT = 280µA Figure 33. SFDR vs. Analog Input Frequency with Different Buffer Current Settings (First and Second Nyquist Zones) –85 –84 –83 –82 –81 –80 –79 –78 –77 –76 –75 –74 –73 –72 –71 –70 –69 –68 –67 –66 –65 ANALOG INPUT FREQUENCY (MHz) BUFFER CURRENT = 200µA BUFFER CURRENT = 240µA BUFFER CURRENT = 280µA BUFFER CURRENT = 320µA Figure 34. SFDR vs. Analog Input Frequency with Different Buffer Current Settings (Third Nyquist Zone) –80 –78 –76 –74 –72 –70 –68 –66 –64 –62 –60 –58 –56 –54 –52 –50 –48 –46 –44 –42 –40 ANALOG INPUT FREQUENCY (MHz) BUFFER CURRENT = 320µA BUFFER CURRENT = 360µA BUFFER CURRENT = 400µA BUFFER CURRENT = 440µA Figure 35. SFDR vs. Analog Input Frequency with Different Buffer Current Settings (Fourth Nyquist Zone) |
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