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AD9690

Data Sheet

Rev. B | Page 16 of 78

100

ANALOG INPUT FREQUENCY (MHz)

978.5

1065.0

1142.4

1220.0

1297.3

1374.8

1452.2

SFDR

SNR

Figure 18. SNR/SFDR vs. fIN; 1 GHz < fIN < 1.5 GHz;

Buffer Control 1 (0x018) = 6.0×

100

ANALOG INPUT FREQUENCY (MHz)

1513.3

1607.4

1701.6

1795.6

1889.7

SFDR

SNR

Figure 19. SNR/SFDR vs. fIN; 1.5 GHz < fIN < 2 GHz;

Buffer Control 1 (0x018) = 7.5×

FREQUENCY (MHz)

–120

–100

–80

–60

–40

–20

500

400

300

200

100

AIN1 AND AIN2 = –7dBFS

SFDR = 87dBFS

IMD2 = 93dBFS

IMD3 = 87dBFS

BUFFER CONTROL 1 = 3.0×

Figure 20. Two-Tone FFT; fIN1 = 184 MHz, fIN2 = 187 MHz

FREQUENCY (MHz)

–120

–100

–80

–60

–40

–20

500

400

300

200

100

AIN1 AND AIN2 = –7dBFS

SFDR = 88dBFS

IMD2 = 93dBFS

IMD3 = 88dBFS

BUFFER CONTROL 1 = 4.5×

Figure 21. Two-Tone FFT; fIN1 = 338 MHz, fIN2 = 341 MHz

–84

–90

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

INPUT AMPLITUDE (dBFS)

–140

–120

–100

–80

–60

–40

–20

SFDR (dBc)

SFDR (dBFS)

IMD3 (dBc)

IMD3 (dBFS)

Figure 22. 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

–100

–80

–60

–40

–20

SFDR (dBc)

SFDR (dBFS)

IMD3 (dBc)

IMD3 (dBFS)

Figure 23. Two-Tone IMD3/SFDR vs. Input Amplitude (AIN) with

fIN1 = 338 MHz and fIN2 = 341 MHz

AD9690 Datasheet(PDF) 17 Page - Analog Devices

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