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AD6644AST-40 Folha de dados(PDF) 11 Page - Analog Devices |
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AD6644AST-40 Folha de dados(HTML) 11 Page - Analog Devices |
11 / 19 page AD6644 –11– REV. 0 FREQUENCY – MHz 0 –120 0 5 10 15 20 –130 25 30 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 ENCODE = 65MSPS AIN = 15.5MHz @ –29.5dBFS NO DITHER Figure 20. 1M FFT Without Dither –90 0 –80 –30 –10 90 50 10 0 40 70 –70 –50 –40 20 30 60 80 100 ENCODE = 65MSPS AIN = 15.5MHz NO DITHER –60 –20 ANALOG INPUT POWER LEVEL – dBFS SFDR = 90dB REFERENCE LINE Figure 21. SFDR Without Dither ENCODE = 65MSPS 30.5MHz ENCODE INPUT POWER – dBm –15.0 15.0 –10.0 0 5.0 80 70 65 85 95 –5.0 10.0 75 WORST SPUR 90 2.2MHz 2.2MHz 30.5MHz SNR Figure 22. SNR, Worst Spurious vs. Clamped Encode Power (See Figure 25) FREQUENCY – MHz 0 –120 0 5 101520 –130 25 30 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 ENCODE = 65MSPS AIN = 15.5MHz @ –29.5dBFS DITHER @ –19dBm Figure 23. 1M FFT with Dither –90 0 –80 –30 –10 90 50 10 0 40 70 –70 –50 –40 20 30 60 80 100 ENCODE = 65MSPS AIN = 15.5MHz DITHER = –19dBm –60 –20 ANALOG INPUT POWER LEVEL – dBFS SFDR = 90dB REFERENCE LINE SFDR = 100dB REFERENCE LINE Figure 24. SFDR with Dither |
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