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AD6640ST Datasheet(PDF) 10 Page - Analog Devices |
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AD6640ST Datasheet(HTML) 10 Page - Analog Devices |
10 / 24 page AD6640 –10– REV. 0 dc 0 –80 –120 –40 –100 –20 –60 ENCODE = 65MSPS AIN = 19.5MHz @ –36dBFS NO DITHER 65 13.0 19.5 26.0 32.5 FREQUENCY – MHz Figure 19. 16K FFT without Dither ANALOG INPUT POWER LEVEL – dBFS 100 0 –80 0 –70 –60 –50 –40 –30 –20 –10 90 60 40 20 10 80 70 50 30 ENCODE = 65MSPS AIN = 19.5MHz NO DITHER SFDR = 80dB REFERENCE LINE Figure 20. SFDR without Dither 50 75 55 60 65 70 FREQUENCY – MHz 0 –80 –120 –40 –100 –20 –60 ENCODE = 50MSPS AIN = 65.5, 68.5MHz NO DITHER –60 –90 –120 –30 0 ANALOG IF FILTER MASK ALIASED SIGNALS Figure 21. IF-Sampling at 70 MHz without Dither 0 –80 –120 –40 –100 –20 –60 ENCODE = 65MSPS AIN = 19.5MHz @ –36dBFS DITHER = –32.5dBm dc 65 13.0 19.5 26.0 32.5 FREQUENCY – MHz Figure 22. 16K FFT with Dither ANALOG INPUT POWER LEVEL – dBFS 100 0 –80 0 –70 –60 –50 –40 –30 –20 –10 90 60 40 20 10 80 70 50 30 ENCODE = 65MSPS AIN = 19.5MHz DITHER = –32.5dBm SFDR = 80dB REFERENCE LINE Figure 23. SFDR with Dither 50 75 55 60 65 70 FREQUENCY – MHz 0 –80 –120 –40 –100 –20 –60 ENCODE = 50MSPS AIN = 65.5MHz, 68.5MHz DITHER = –32.5dBm –60 –90 –120 –30 0 ANALOG IF FILTER MASK ALIASED SIGNALS Figure 24. IF-Sampling at 70 MHz with Dither |
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