AD6688 datasheet(18/138 Pages) AD

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AD6688

Data Sheet

Rev. 0 | Page 18 of 138

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–187.5 –150.0 –112.5 –75.0 –37.5

37.5

75.0

112.5 150.0 187.5

FREQUENCY (MHz)

AIN1 AND AIN2 = –15dBFS

SFDR = 96dBFS

IMD2 = 115dBFS

IMD3 = 96dBFS

Figure 17. Two-Tone FFT; fIN1 = 1841.5 MHz, fIN2 = 1846.5 MHz;

NCO Frequency = 1874.28 MHz; fS = 3 GHz

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37.5

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112.5 150.0 187.5

FREQUENCY (MHz)

AIN1 AND AIN2 = –15dBFS

SFDR = 94dBFS

IMD2 = 115dBFS

IMD3 = 94dBFS

Figure 18. Two-Tone FFT; fIN1 = 2137.5 MHz, fIN2 = 2142.5 MHz

NCO Frequency = 2176.92 MHz; fS = 3 GHz

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–90

–70

–50

–30

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–187.5 –150.0 –112.5 –75.0 –37.5

37.5

75.0

112.5 150.0 187.5

FREQUENCY (MHz)

AIN1 AND AIN2 = –15dBFS

NCO FREQUENCY = 1874.28MHz

SFDR = 80dBFS

Figure 19. Two-Tone FFT; fIN1 = 1800 MHz, fIN2 = 2100 MHz

NCO Frequency = 1874.28 MHz; fS = 2.94912 GHz

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–50

–30

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–187.5 –150.0 –112.5 –75.0 –37.5

37.5

75.0

112.5 150.0 187.5

FREQUENCY (MHz)

AIN1 AND AIN2 = –15dBFS

NCO FREQUENCY = 2176.9MHz

SFDR = 94dBFS

Figure 20. Two-Tone FFT; fIN1 = 1800 MHz, fIN2 = 2100 MHz

NCO Frequency = 2176.92 MHz; fS = 2.94912 GHz

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INPUT AMPLITUDE (dBFS)

IMD3 (dBFS)

IMD3 (dBc)

SFDR (dBFS)

SFDR (dBc)

Figure 21. Two-Tone SFDR/IMD3 vs. Input Amplitude with

fIN1 = 1841.5 MHz, fIN2 = 1846.5 MHz

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–95 –89 –83 –77 –71 –65 –59 –53 –47 –41 –35 –29 –23 –17

INPUT AMPLITUDE (dBFS)

IMD3 (dBFS)

IMD3 (dBc)

SFDR (dBFS)

SFDR (dBC)

–11 –7

Figure 22. Two-Tone SFDR/IMD3 vs. Input Amplitude with

fIN1 = 2137.5 MHz, fIN2 = 2142.5 MHz

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