AD6643 查看數據表（PDF） - Analog Devices
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AD6643 Datasheet PDF : 40 Pages
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Data Sheet
100
95
90
85
80
SNR, CHANNEL B
75
SFDR, CHANNEL B
SNR, CHANNEL A
SFDR, CHANNEL A
70
65
60
40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
SAMPLE RATE (MSPS)
Figure 18. AD6643-200 Single Tone SNR/SFDR vs. Sample Rate (fS)
with fIN = 90.1 MHz
12,000
10,000
0.614LSB rms
16,384 TOTAL HITS
8000
6000
4000
2000
0
N N+1
OUTPUT CODE
Figure 19. AD6643-200 Grounded Input Histogram
0
250MSPS
30.1MHz @ –1.0dBFS
–20
SNR = 65.4dB (66.4dBFS)
SFDR = 88dBc
–40
–60
SECOND HARMONIC THIRD HARMONIC
–80
–100
–120
–140
0
10 20 30 40 50 60 70 80 90 100 110 120
FREQUENCY (MHz)
Figure 20. AD6643-250 Single Tone FFT, fIN = 30.1 MHz
AD6643
0
250MSPS
90.1MHz @ –1.0dBFS
–20 SNR = 65.2dB (66.2dBFS)
SFDR = 88dBc
–40
–60
THIRD HARMONIC SECOND HARMONIC
–80
–100
–120
–140
0
10 20 30 40 50 60 70 80 90 100 110 120
FREQUENCY (MHz)
Figure 21. AD6643-250 Single Tone FFT, fIN = 90.1 MHz
0
250MSPS
140.1MHz @ –1.0dBFS
–20 SNR = 65.1dB (66.1dBFS)
SFDR = 87dBc
–40
–60
SECOND HARMONIC
–80
THIRD HARMONIC
–100
–120
–140
0
10 20 30 40 50 60 70 80 90 100 110 120
FREQUENCY (MHz)
Figure 22. AD6643-250 Single Tone FFT, fIN = 140.1 MHz
0
250MSPS
185.1MHz @ –1.0dBFS
–20 SNR = 64.9dB (65.9dBFS)
SFDR = 85dBc
–40
–60
SECOND HARMONIC
–80
THIRD HARMONIC
–100
–120
–140
0
10 20 30 40 50 60 70 80 90 100 110 120
FREQUENCY (MHz)
Figure 23. AD6643-250 Single Tone FFT, fIN = 185.1 MHz
Rev. C | Page 17 of 40
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