AD9680 datasheet(19/99 Pages) AD

19 / 99 page

Data Sheet

AD9680

Rev. C | Page 17 of 97

INPUT FREQUENCY (MHz)

SNR 8.5×

SFDR 8.5×

1252.3

1356.3

1460.3

1564.3

1668.3

177.23

1876.3

1980.3

Figure 18. SNR/SFDR vs. fIN; 1.3 GHz < fIN < 2GHz;

Buffer Control 1 (0x018) = 8.5×

–120

–100

–80

–60

–40

–20

FREQUENCY (MHz)

AIN1 AND AIN2 = –7dBFS

SFDR = 82dBFS

IMD2 = 84dBFS

IMD3 = 82dBFS

BUFFER CURRENT = 3.5×

78.125

156.250 234.375 312.500 390.625 468.750 546.875 625.000

Figure 19. Two-Tone FFT; fIN1 = 184 MHz, fIN2 = 187 MHz

–120

–100

–80

–60

–40

–20

FREQUENCY (MHz)

AIN1 AND AIN2 = –7dBFS

SFDR = 78dBFS

IMD2 = 78dBFS

IMD3 = 78dBFS

BUFFER CURRENT = 5.5×

78.125

156.250 234.375 312.500 390.625 468.750 546.875 625.000

Figure 20. Two-Tone FFT; fIN1 = 449 MHz, fIN2 = 452 MHz

–84

–90

–78 –72 –66 –60 –54 –48 –42 –36 –30 –24 –18 –12 –6

INPUT AMPLITUDE (dBFS)

–120

–20

–40

–60

–80

–100

IMD3 (dBc)

IMD3 (dBFS)

SFDR (dBFS)

SFDR (dBc)

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

fIN1 = 184 MHz and fIN2 = 187 MHz

–84

–90

–78 –72 –66 –60 –54 –48 –42 –36 –30 –24 –18 –12 –6

INPUT AMPLITUDE (dBFS)

–140

–120

–20

–40

–60

–80

–100

IMD3 (dBc)

IMD3 (dBFS)

SFDR (dBFS)

SFDR (dBc)

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

fIN1 = 449 MHz and fIN2 = 452 MHz

–84

–90

–78 –72 –66 –60 –54 –48 –42 –36 –30 –24 –18 –12 –6

INPUT AMPLITUDE (dBFS)

–40

–20

100

120

SNR (dBFS)

SNR (dBc)

SFDR (dBc)

SFDR (dBFS)

Figure 23. SNR/SFDR vs. Analog Input Level, fIN = 170.3 MHz

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