AD9681 datasheet(16/40 Pages) AD

16 / 40 page

AD9681

Data Sheet

Rev. A | Page 16 of 40

120

–20

–100

INPUT AMPLITUDE (dBFS)

100

–90

–80

–70

–60

–50

–40

–30

–20

–10

SNR (dB)

SFDR (dBc)

SNRFS (dBFS)

SFDR (dBFS)

Figure 17. SNR/SFDR vs. Input Amplitude (AIN); fIN = 9.7 MHz;

fSAMPLE = 125 MSPS

–20

–40

–60

–80

–100

–120

–140

102030405060

FREQUENCY (MHz)

AIN = –7dBFS

fIN = 70MHz, 72.5MHz

IMD2 = –100dBc

IMD3 = –99.5dBc

SFDR = 97.5dBc

F2–F1

F1+F2

F1+2F2

2F1+F2

2F2–F1

2F1–F2

Figure 18. Two-Tone 32k FFT with fIN1 = 70.5 MHz and fIN2 = 72.5 MHz;

fSAMPLE = 125 MSPS

–20

–40

–60

–80

–100

–120

–90

–10

–20

–30

–40

–50

–60

–70

–80

INPUT AMPLITUDE (dBFS)

SFDR (dBc)

IMD3 (dBc)

SFDR (dBFS)

IMD3 (dBFS)

Figure 19. Two-Tone SFDR/IMD3 vs. Input Amplitude (AIN) with

fIN1 = 70.0 MHz and fIN2 = 72.5 MHz; fSAMPLE = 125 MSPS

100

150

200

250

300

350

400

450

500

INPUT FREQUENCY (MHz)

SNRFS (dBFS)

SFDR (dBc)

Figure 20. SNR/SFDR vs. fIN; fSAMPLE = 125 MSPS

100

–40

–15

TEMPERATURE (°C)

SNRFS (dBFS)

SFDR (dBc)

Figure 21. SNR/SFDR vs. Temperature; fIN = 9.7 MHz, fSAMPLE = 125 MSPS

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