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AD6645 Datasheet(PDF) 11 Page - Analog Devices

Part # AD6645
Description  14-Bit, 80 MSPS/105 MSPS A/D Converter
Download  24 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD6645 Datasheet(HTML) 11 Page - Analog Devices

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AD6645
Rev. D | Page 11 of 24
FREQUENCY (MHz)
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
ENCODE = 80MSPS
AIN = 30.5MHz,
31.5MHz (–7dBFS)
NO DITHER
5
0
10152025303540
Figure 16. Two-Tone SFDR @ 30.5 MHz and 31.5 MHz
INPUT POWER LEVEL (F1 = F2 dBFS)
0
10
20
30
40
50
60
70
80
90
100
110
dBc
dBFS
SFDR = 90dB
REFERENCE LINE
ENCODE = 80MSPS
F1 = 30.5MHz
F2 = 31.5MHz
–77
–67
–57
–47
–37
–27
–17
–7
Figure 17. Two-Tone SFDR @ 30.5 MHz and 31.5 MHz
ENCODE FREQUENCY (MHz)
65
70
80
90
WORST SPUR @ AIN = 2.2MHz
SNR @ AIN = 2.2MHz
75
85
95
100
15
30
45
60
75
90
105
Figure 18. SNR, Worst-Case Spurious vs. Encode @ 2.2 MHz
FREQUENCY (MHz)
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
ENCODE = 80MSPS
AIN = 55.25MHz,
56.25MHz (–7dBFS)
NO DITHER
5
0
101520
25303540
Figure 19. Two-Tone SFDR @ 55.25 MHz and 56.25 MHz
INPUT POWER LEVEL (F1 = F2 dBFS)
0
10
20
30
40
50
60
70
80
90
100
110
dBc
dBFS
SFDR = 90dB
REFERENCE LINE
ENCODE = 80MSPS
F1 = 55.25MHz
F2 = 56.25MHz
–77
–67
–57
–47
–37
–27
–17
–7
Figure 20. Two-Tone SFDR @ 55.25 MHz and 56.25 MHz
ENCODE FREQUENCY (MHz)
65
70
80
90
WORST SPUR @ AIN = 69.1MHz
SNR @ AIN = 69.1MHz
75
85
95
15
30
45
60
75
90
105
Figure 21. SNR, Worst-Case Spurious vs. Encode @ 69.1 MHz


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