AD6645 데이터 시트보기 (PDF) - Analog Devices
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AD6645 Datasheet PDF : 24 Pages
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AD6645
0
ENCODE = 80.0MSPS
–10 AIN = 30.5MHz @ –29.5dBFS
NO DITHER
–20
–30
–40
–50
–60
–70
–80
2
–90
6
–100
4
3
–110
5
–120
–130
0
5
10
15
20
25
30
35
40
FREQUENCY (MHz)
Figure 22. 1 M Sample FFT Without Dither
110
ENCODE = 80.0MSPS
100 AIN = 30.5MHz
NO DITHER
90
80
70
60
50
40
30
SFDR = 90dB
REFERENCE LINE
20
10
0
90 80 70 60 50 40 30 20 10 0
ANALOG INPUT LEVEL (dBFS)
Figure 23. SFDR Without Dither
0
ENCODE = 76.8MSPS
–10
AIN = 69.1MHz @ –1dBFS
–20
SNR = 73.5dB
SFDR = 89.0dBc
–30
–40
–50
–60
–70
–80
–90
–100
–110
3
5
2
6
4
–120
–130
0
5
10
15
20
25
30
35
40
FREQUENCY (MHz)
Figure 24. Single Tone @ 69.1 MHz, Encode = 76.8 MSPS
0
ENCODE = 80.0MSPS
–10 AIN = 30.5MHz @ –29.5dBFS
WITH DITHER @ –19.2 dBm
–20
–30
–40
–50
–60
–70
–80
–90
–100
4
2
–110
53
6
–120
–130
0
5
10
15
20
25
30
35
40
FREQUENCY (MHz)
Figure 25. 1 M Sample FFT with Dither
110
ENCODE = 80.0MSPS
100 AIN = 30.5MHz
WITH DITHER @ –19.2dBm
90
80
70
SFDR = 100dB
60 REFERENCE LINE
50
40
30
SFDR = 90dB
REFERENCE LINE
20
10
0
–90 –80 –70 –60 –50 –40 –30 –20 –10 0
ANALOG INPUT LEVEL (dBFS)
Figure 26. SFDR with Dither
0
ENCODE = 76.8MSPS
–10
AIN = W-CDMA @ 69.1MHz
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
2
3
64
5
–120
–130
0
5
10
15
20
25
30
35
40
FREQUENCY (MHz)
Figure 27. W-CDMA Tone @ 69.1 MHz, Encode = 76.8 MSPS
Rev. D | Page 12 of 24
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