Datasheet

AD9251
Rev. A | Page 13 of 36
TYPICAL PERFORMANCE CHARACTERISTICS
AD9251-80
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
4 8 12 16 20 24 28 32 36
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-033
4
3
5
6
2
80MSPS
9.7MHz @ –1dBFS
SNR = 73.4dB (74.4dBFS)
SFDR = 94.4dBc
Figure 6. Single-Tone FFT with f
IN
= 9.7 MHz
0
–15
–30
–45
–60
–75
–90
–105
–120
4
4
2
3
5
6
8 12162024283236
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-062
80MSPS
70.3MHz @ –1dBFS
SNR = 72.1dB (73.1dBFS)
SFDR = 93.5dBc
Figure 7. Single-Tone FFT with f
IN
= 70.3 MHz
0
–15
–30
–45
–60
–75
–90
–105
–120
4 8 12 16 20 24 28 32 36
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-200
80MSPS
30.5MHz @ –7dBFS
32.5MHz @ –7dBFS
SFDR = 89.5dBc (96.5dBFS)
F2–F1
F1 + F2
2F1 – F2
2F2 + F1
2F2 – F1
2F1 + F2
Figure 8. Two-Tone FFT with f
IN1
= 30.5 MHz and f
IN2
= 32.5 MHz
0
–15
–30
–45
–60
–75
–90
–105
–120
4 8 12 16 20 24 28 32 36
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-034
4
3
5
6
2
80MSPS
30.5MHz @ –1dBFS
SNR = 73.2dB (74.2dBFS)
SFDR = 93.6dBc
Figure 9. Single-Tone FFT with f
IN
= 30.5 MHz
0
–15
–30
–45
–60
–75
–90
–105
–120
4
4
23
5
6
8 12162024283236
FREQUENCY (MHz)
AMPLITUDE (dBFS)
07938-036
80MSPS
200MHz @ –1dBFS
SNR = 70.5dB (71.5dBFS)
SFDR = 80.2dBc
Figure 10. Single-Tone FFT with f
IN
= 200 MHz
0
–20
–40
–60
–80
–100
–120
–90 –78 –66 –54 –42 –30 –18 –6
INPUT AMPLITUDE (dBFS)
SFDR/IMD3 (dBc/dBFS)
07938-054
SFDR (dBc)
SFDR (dBFS)
IMD3 (dBc)
IMD3 (dBFS)
Figure 11. Two-Tone SFDR/IMD3 vs. Input Amplitude (AIN) with f
IN1
=
30.5 MHz and f
IN2
= 32.5 MHz