AD6640ST Просмотр технического описания (PDF) - Analog Devices
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AD6640ST Datasheet PDF : 24 Pages
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AD6640
0
ENCODE = 65MSPS
AIN = 19.5MHz @ –36dBFS
–20 NO DITHER
–40
–60
–80
–100
–120
dc
65
13.0
19.5
26.0
32.5
FREQUENCY – MHz
Figure 19. 16K FFT without Dither
100
90
ENCODE = 65MSPS
80
AIN = 19.5MHz
NO DITHER
70
60
50
40
30
20
SFDR = 80dB
10
REFERENCE LINE
0
–80 –70 –60 –50 –40 –30 –20 –10 0
ANALOG INPUT POWER LEVEL – dBFS
Figure 20. SFDR without Dither
0
0
ENCODE = 50MSPS
AIN = 65.5, 68.5MHz
–20 NO DITHER
–30
ALIASED
–40
SIGNALS
–60
ANALOG IF
–60
FILTER MASK
–80
–90
–100
–120
50
55
60
65
70
FREQUENCY – MHz
–120
75
Figure 21. IF-Sampling at 70 MHz without Dither
0
ENCODE = 65MSPS
–20
AIN = 19.5MHz @ –36dBFS
DITHER = –32.5dBm
–40
–60
–80
–100
–120
dc
65
13.0
19.5
26.0
32.5
FREQUENCY – MHz
Figure 22. 16K FFT with Dither
100
90
ENCODE = 65MSPS
80
AIN = 19.5MHz
DITHER = –32.5dBm
70
60
50
40
30
20
10
SFDR = 80dB
REFERENCE LINE
0
–80 –70 –60 –50 –40 –30 –20 –10
0
ANALOG INPUT POWER LEVEL – dBFS
Figure 23. SFDR with Dither
0
0
ENCODE = 50MSPS
–20
AIN = 65.5MHz, 68.5MHz
DITHER = –32.5dBm
–30
–40
ALIASED
SIGNALS
–60
–60
ANALOG IF
FILTER MASK
–80
–90
–100
–120
50
55
60
65
70
FREQUENCY – MHz
–120
75
Figure 24. IF-Sampling at 70 MHz with Dither
–10–
REV. 0
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