Datasheet

AD9251
Rev. A | Page 15 of 36
AD9251-65
AVDD = 1.8 V; DRVDD = 1.8 V, maximum sample rate, 2 V p-p differential input, 1.0 V internal reference; AIN = −1.0 dBFS, DCS
disabled, unless otherwise noted.
0
–15
–30
–45
–60
–75
–90
–105
–120
3 6 9 12151821242730
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-030
4
3
5
6
2
65MSPS
9.7MHz @ –1dBFS
SNR = 73.5dB (74.5dBFS)
SFDR = 97.7dBc
Figure 18. Single-Tone FFT with f
IN
= 9.7 MHz
0
–15
–30
–45
–60
–75
–90
–105
–120
3 6 9 12151821242730
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-032
4
35
2
6
65MSPS
70.3MHz @ –1dBFS
SNR = 72.6dB (73.6dBFS)
SFDR = 94.1dBc
Figure 19. Single-Tone FFT with f
IN
= 70.3 MHz
0
–15
–30
–45
–60
–75
–90
–105
–120
3 6 9 12151821242730
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-031
65MSPS
30.5MHz @ –1dBFS
SNR = 73.3dB (74.3dBFS)
SFDR = 99.3dBc
4
3
5
6
2
Figure 20. Single-Tone FFT with f
IN
= 30.5 MHz
120
SNR
SNRFS
SFDR
SFDRFS
100
80
60
40
20
0
–90 –80 –60 –40 –20 0
INPUT AMPLITUDE (dBFS)
SNR/SFDR (dBFS)
07938-060
Figure 21. SNR/SFDR vs. Input Amplitude (AIN) with f
IN
= 9.7 MHz
100
90
80
70
60
50
40
30
20
10
0
0 50 100 150 200
INPUT FREQUENCY (MHz)
SNR/SFDR (dBFS/dBc)
07938-056
SFDR (dBc)
SNR (dBFS)
Figure 22. SNR/SFDR vs. Input Frequency (AIN) with
2 V p-p Full Scale