AD9690 datasheet(21/79 Pages) AD

21 / 79 page

AD9690

Data Sheet

Rev. B | Page 20 of 78

1010.3

1205.3

1410.3

1600.3

1810.3

1950.3

ANALOG INPUT FREQUENCY (MHz)

7.0× SNR

7.0× SFDR

8.0× SNR

8.0× SFDR

Figure 42. SNR/SFDR vs. fIN; 1 GHz < fIN < 2 GHz;

Buffer Control 1 (0x018) = 7.0× and 8.0×

–120

–100

–80

–60

–40

–20

100

150

200

250

FREQUENCY (MHz)

AIN1 AND AIN2 = –7dBFS

SFDR = 88dBFS

IMD2 = 94dBFS

IMD3 = 88dBFS

BUFFER CONTROL 1 = 2.0×

Figure 43. Two-Tone FFT; fIN1 = 184 MHz, fIN2 = 187 MHz

–120

–100

–80

–60

–40

–20

100

150

200

250

FREQUENCY (MHz)

AIN1 AND AIN2 = –7dBFS

SFDR = 88dBFS

IMD2 = 88dBFS

IMD3 = 89dBFS

BUFFER CONTROL 1 = 4.5×

Figure 44. Two-Tone FFT; fIN1 = 338 MHz, fIN2 = 341 MHz

–120

–100

–80

–60

–40

–20

–

90 –84 –78 –72 –66 –60 –54 –48 –42 –36 –30 –24 –18 –12

INPUT AMPLITUDE (dBFS)

SFDR (dBc)

SFDR (dBFS)

IMD3 (dBc)

IMD3 (dBFS)

Figure 45. Two-Tone SFDR/IMD3 vs. Input Amplitude (AIN) with

fIN1 = 184 MHz and fIN2 = 187 MHz

–120

–100

–80

–60

–40

–20

–90

–81

–72

–63

–54

–45

–36

–27

–18

–9

AMPLITUDE (dBFS)

SFDR (dBc)

SFDR (dBFS)

IMD3 (dBc)

IMD3 (dBFS)

Figure 46. Two-Tone IMD3/SFDR vs. Input Amplitude (AIN) with

fIN1 = 338 MHz and fIN2 = 341 MHz

–20

–10

100

110

–90

–80

–70

–60

–50

–40

–30

–20

–10

INPUT AMPLITUDE (dBFS)

SFDR (dBFS)

SNR (dBFS)

SFDR (dBc)

SNR (dBc)

Figure 47. SNR/SFDR vs. Analog Input Level, fIN = 170.3 MHz

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