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AD6679 데이터시트(PDF) 26 Page - Analog Devices |
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AD6679 데이터시트(HTML) 26 Page - Analog Devices |
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26 / 81 page ![]() AD6679 Data Sheet Rev. B | Page 26 of 81 –140 –120 –100 –80 –60 –40 –20 0 0 25 50 75 100 125 150 175 200 225 250 FREQUENCY (MHz) AIN = −1dBFS SNR = 61.7dBFS ENOB = 9.9 BITS SFDR = 70dBFS BUFFER CONTROL 1 = 8.0× Figure 21. Single-Tone FFT with fIN = 1205.3 MHz –140 –120 –100 –80 –60 –40 –20 0 0 25 50 75 100 125 150 175 200 225 250 FREQUENCY (MHz) AIN = −1dBFS SNR = 60.1dBFS ENOB = 9.7 BITS SFDR = 71dBFS BUFFER CONTROL 1 = 8.0× Figure 22. Single-Tone FFT with fIN = 1630.3 MHz –140 –120 –100 –80 –60 –40 –20 0 0 25 50 75 100 125 150 175 200 225 250 FREQUENCY (MHz) AIN = −1dBFS SNR = 59.0dBFS ENOB = 9.5 BITS SFDR = 69dBFS BUFFER CONTROL 1 = 8.0× Figure 23. Single-Tone FFT with fIN = 1950.3 MHz 65 70 75 80 85 90 95 200 250 300 350 SAMPLE RATE (MHz) 400 450 500 SFDR SNR Figure 24. SNR/SFDR vs. Sample Rate (fS); fIN = 170.3 MHz; 60 65 70 75 80 85 90 95 50 100 150 200 250 300 350 400 450 500 ANALOG INPUT FREQUENCY (MHz) SFDR, 2.0× SNRFS, 2.0× SFDR, 3.0× SNRFS, 3.0× SFDR, 4.0× SNRFS, 4.0× Figure 25. SNR/SFDR vs. Analog Input Frequency (fIN); fIN < 500 MHz; Buffer Control 1 Setting = 2.0×, 3.0×, and 4.0× –120 –100 –80 –60 –40 –20 0 0 50 100 150 200 250 FREQUENCY (MHz) AIN1 AND AIN2 = –7dBFS SFDR = 88dBFS IMD2 = 95dBFS IMD3 = 88dBFS BUFFER CONTROL 1 = 2.0× Figure 26. Two-Tone FFT; fIN1 = 184 MHz, fIN2 = 187 MHz |
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