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AD6644ST Datasheet(PDF) 11 Page - Analog Devices

Part # AD6644ST
Description  14-Bit, 40 MSPS/65 MSPS A/D Converter
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD6644ST Datasheet(HTML) 11 Page - Analog Devices

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AD6644
–11–
REV. 0
FREQUENCY – MHz
0
–120
0
5
10
15
20
–130
25
30
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
NO DITHER
Figure 20. 1M FFT Without Dither
–90
0
–80
–30
–10
90
50
10
0
40
70
–70
–50
–40
20
30
60
80
100
ENCODE = 65MSPS
AIN = 15.5MHz
NO DITHER
–60
–20
ANALOG INPUT POWER LEVEL – dBFS
SFDR = 90dB
REFERENCE LINE
Figure 21. SFDR Without Dither
ENCODE = 65MSPS
30.5MHz
ENCODE INPUT POWER – dBm
–15.0
15.0
–10.0
0
5.0
80
70
65
85
95
–5.0
10.0
75
WORST SPUR
90
2.2MHz
2.2MHz
30.5MHz
SNR
Figure 22. SNR, Worst Spurious vs. Clamped Encode
Power (See Figure 25)
FREQUENCY – MHz
0
–120
0
5
101520
–130
25
30
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
ENCODE = 65MSPS
AIN = 15.5MHz @ –29.5dBFS
DITHER @ –19dBm
Figure 23. 1M FFT with Dither
–90
0
–80
–30
–10
90
50
10
0
40
70
–70
–50
–40
20
30
60
80
100
ENCODE = 65MSPS
AIN = 15.5MHz
DITHER = –19dBm
–60
–20
ANALOG INPUT POWER LEVEL – dBFS
SFDR = 90dB
REFERENCE LINE
SFDR = 100dB
REFERENCE LINE
Figure 24. SFDR with Dither


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