Datasheet

AD9251
Rev. A | Page 16 of 36
AD9251-40
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
2 4 6 8 10 12 14 16 18
FREQUENCY (MHz)
AMPLITUDE (dB)
07938-028
4
3
5
6
2
40MSPS
9.7MHz @ –1dBFS
SNR = 73.5dB (74.5dBFS)
SFDR = 95.4dBc
Figure 23. Single-Tone FFT with f
IN
= 9.7 MHz
0
–15
–30
–45
–60
–75
–90
–105
–120
2 4 6 8 10 12 14 16 18
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-029
4
3
5
6
2
40MSPS
30.5MHz @ –1dBFS
SNR = 73.2dB (74.2dBFS)
SFDR = 95.7dBc
Figure 24. 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)
07938-059
Figure 25. SNR/SFDR vs. Input Amplitude (AIN) with f
IN
= 9.7 MHz