AD9280-EB datasheet(18/25 Pages) AD

18 / 25 page

AD9280

–17–

Figures 35–38 combine the dual-tone SFDR as well as single

tone SFDR and SNR performance at IF frequencies of 45 MHz,

70 MHz, 85 MHz and 135 MHz. Note, the SFDR vs. ampli-

tude data is referenced to dBFS while the single tone SNR data

INPUT POWER LEVEL – dBFS

–0.5

–40

–5

–10

–15

–20

–25

–30

–35

SNR

DUAL TONE SFDR

SINGLE TONE SFDR

CLK = 25.7MHz

SINGLE TONE = 45.5MHz

DUAL TONE F1 = 44.5MHz

F2 = 45.5MHz

Figure 35. SNR/SFDR for IF @ 45 MHz

INPUT POWER LEVEL – dBFS

–0.5

–40

–5

–10

–15

–20

–25

–30

–35

SNR

DUAL TONE SFDR

SINGLE TONE SFDR

CLK = 31.1MHz

SINGLE TONE = 70.5MHz

DUAL TONE F1 = 69.5MHz

F2 = 70.5MHz

Figure 36. SNR/SFDR for IF @ 70 MHz

is referenced to dBc. The AD9280 was operated in the differen-

tial mode (via transformer) with a 1 V span. The analog sup-

ply (AVDD) and the digital supply (DRVDD) were set to +5 V

and 3.3 V, respectively.

INPUT POWER LEVEL – dBFS

–0.5

–40

–5

–10

–15

–20

–25

–30

–35

SNR

DUAL TONE SFDR

SINGLE TONE SFDR

CLK = 30.9MHz

SINGLE TONE = 85.5MHz

DUAL TONE F1 = 84.5MHz

F2 = 85.5MHz

Figure 37. SNR/SFDR for IF @ 85 MHz

INPUT POWER LEVEL – dBFS

–0.5

–40

–5

–10

–15

–20

–25

–30

–35

SNR

SINGLE TONE SFDR

FS = 32MHz

SINGLE TONE = 135.5MHz

F1 = 134.5MHz

F2 = 135.5MHz

DUAL TONE SFDR

Figure 38. SNR/SFDR for IF @ 135 MHz

REV. E

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