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AD6644ST/PCBZ датащи(PDF) 12 Page - Analog Devices

номер детали AD6644ST/PCBZ
подробное описание детали  Analog-to-Digital Converter
PDF  25 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD6644ST/PCBZ датащи(HTML) 12 Page - Analog Devices

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AD6644
Rev. D | Page 11 of 24
FREQUENCY (MHz)
0
–120
–130
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
5
10
15
20
25
30
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
NO DITHER
Figure 16. 1M FFT Without Dither
90
50
10
0
40
70
20
30
60
80
100
ANALOG INPUT POWER LEVEL (dBFS)
ENCODE = 65MSPS
AIN = 15.5MHz
NO DITHER
SFDR = 90dB
REFERENCE LINE
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
Figure 17. SFDR Without Dither
ENCODE = 65MSPS
30.5MHz
ENCODE INPUT POWER (dBm)
80
70
65
85
95
75
WORST SPUR
90
2.2MHz
2.2MHz
30.5MHz
SNR
–15
–10
–5
0
5
10
15
Figure 18. SNR, Worst Spurious vs. Clamped Encode Power (See Figure 27)
FREQUENCY (MHz)
0
–120
–130
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
DITHER @ –19dBm
0
5
10
15
20
25
30
Figure 19. 1M FFT with Dither
90
50
10
0
40
70
20
30
60
80
100
ANALOG INPUT POWER LEVEL (dBFS)
ENCODE = 65MSPS
AIN = 15.5MHz
DITHER = –19dBm
SFDR = 100dB
REFERENCE LINE
SFDR = 90dB
REFERENCE LINE
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
Figure 20. SFDR with Dither



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