AD6644STSLASHPCB datasheet(10/19 Pages) AD

10 / 19 page

AD6644

–10–

REV. 0

HARMONICS (2nd, 3rd)

ANALOG FREQUENCY – MHz

100

WORST OTHER SPUR

ENCODE = 65MSPS

AIN = –1dBFS

Figure 14. Harmonics vs. Analog Frequency (IF)

ANALOG INPUT POWER LEVEL – dBFS

–80

–70

–40

–20

–10

100

120

–60

–50

–30

110

SFDR = 90dB

REFERENCE LINE

ENCODE = 65MSPS

AIN = 15.5MHz

dBc

dBFS

Figure 15. Single Tone SFDR

FREQUENCY – MHz

–120

101520

–130

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 65MSPS

AIN = 19MHz,

19.5MHz @ –7dBFS

NO DITHER

Figure 16. Two Tones at 19 MHz and 19.5 MHz

FREQUENCY – MHz

–120

101520

–130

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

ENCODE = 65MSPS

AIN = 15MHz,

15.5MHz @ –7dBFS

NO DITHER

Figure 17. Two Tones at 15 MHz and 15.5 MHz

INPUT POWER LEVEL – (F1 = F2) dBFS

–77

–7

–67

–27

–17

100

–57

–47

–37

110

ENCODE = 65MSPS

F1 = 15MHz

F2 = 15.5MHz

SFDR = 90dB

REFERENCE LINE

dBFS

dBc

Figure 18. Two-Tone SFDR

ENCODE FREQUENCY – MHz

100

WORST SPUR

SNR

AIN = 2.2MHz @ –1dBFS

Figure 19. SNR, Worst Spurious vs. Encode

AD6644ST/PCB 数据表(PDF) 10 Page - Analog Devices

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