AD6645 datasheet(12/24 Pages) AD

12 / 24 page

AD6645

Rev. D | Page 12 of 24

FREQUENCY (MHz)

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 80.0MSPS

AIN = 30.5MHz @ –29.5dBFS

NO DITHER

101520

25303540

Figure 22. 1 M Sample FFT Without Dither

ANALOG INPUT LEVEL (dBFS)

100

110

SFDR = 90dB

REFERENCE LINE

ENCODE = 80.0MSPS

AIN = 30.5MHz

NO DITHER

Figure 23. SFDR Without Dither

FREQUENCY (MHz)

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 76.8MSPS

AIN = 69.1MHz @ –1dBFS

SNR = 73.5dB

SFDR = 89.0dBc

10152025303540

Figure 24. Single Tone @ 69.1 MHz, Encode = 76.8 MSPS

FREQUENCY (MHz)

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

10152025303540

ENCODE = 80.0MSPS

AIN = 30.5MHz @ –29.5dBFS

WITH DITHER @ –19.2 dBm

Figure 25. 1 M Sample FFT with Dither

ANALOG INPUT LEVEL (dBFS)

100

110

–90

–80

–70

–60

–50

–40

–30

–20

–10

SFDR = 90dB

REFERENCE LINE

SFDR = 100dB

REFERENCE LINE

ENCODE = 80.0MSPS

AIN = 30.5MHz

WITH DITHER @ –19.2dBm

Figure 26. SFDR with Dither

FREQUENCY (MHz)

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 76.8MSPS

AIN = W-CDMA @ 69.1MHz

Figure 27. W-CDMA Tone @ 69.1 MHz, Encode = 76.8 MSPS

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