AD6688 datasheet(17/138 Pages) AD

17 / 138 page

Data Sheet

AD6688

Rev. 0 | Page 17 of 138

–135

–120

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–90

–75

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–45

–30

–15

–184.32 –138.24 –92.16

–46.08

46.08

92.16

138.24

184.32

FREQUENCY (MHz)

AIN = –2dBFS

NSD = –148.0dBFS/Hz

IN-BAND SNR = 63.4dBFS

IN-BAND SFDR = 89dBFS

BUFFER CURRENT = 500µA

Figure 11. Single-Tone FFT at fIN = 2690 MHz, NCO Frequency = 2655 MHz,

AIN = −2 dBFS; fS = 2.94912 GHz

–135

–120

–105

–90

–75

–60

–45

–30

–15

–184.32 –138.24 –92.16

–46.08

46.08

92.16

138.24

184.32

FREQUENCY (MHz)

AIN = –2dBFS

NSD = –148.0dBFS/Hz

IN-BAND SNR = 63.4dBFS

IN-BAND SFDR = 89dBFS

BUFFER CURRENT = 500µA

Figure 12. Single-Tone FFT at fIN = 2690 MHz, NCO Frequency = 2655 MHz,

AIN = −2 dBFS; fS = 2.94912 GHz

–152.0

–151.8

–151.6

–151.4

–151.2

–151

–150.8

–150.6

–150.4

–150.2

–150.0

155 455 755 1055 1355 1655 1955 2255 2555 2855 3155 3455 3755

INPUT FREQUENCY (MHz)

Figure 13. NSD vs. fIN; AIN = −9 dBFS

INPUT FREQUENCY (MHz)

–9dBFS

–2dBFS

155 455 755 1055 1355 1655 1955 2255 2555 2855 3205 3505 3805

Figure 14. SFDR vs. fIN; AIN = −2 dBFS and −9 dBFS

155 455 755 1055 1355 1655 1955 2255 2555 2855 3205 3505 3805

–80

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INPUT FREQUENCY (MHz)

–9dBFS

–2dBFS

Figure 15. Second Harmonic Distortion (HD2) vs. fIN;

AIN = −2 dBFS and −9 dBFS

–90

–80

–70

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–50

–40

–30

–20

–10

INPUT FREQUENCY (MHz)

–9dBFS

–2dBFS

155 455 755 1055 1355 1655 1955 2255 2555 2855 3205 3505 3805

Figure 16. Third Harmonic Distortion (HD3) vs. fIN;

AIN = −2 dBFS and −9 dBFS

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