Datasheet

AD9271
Rev. B | Page 18 of 60
0
–15
–10
–5
–25
–20
–30
FUNDAMENTAL (dBFS)
–35
–40
0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0
06304-030
FREQUENCY (MHz)
–3dB LINE
(1/3) × 50MSPS
(1/3) × 40MSPS
(1/3) × 25MSPS
Figure 30. Antialiasing Filter (AAF) Pass-Band Response, No HPF Applied
300
50
100
150
200
250
GROUP DELAY (ns)
0
0.1 1 10 100
06304-033
ANALOG INPUT FREQUENCY (MHz)
V
GAIN
= 0V
V
GAIN
= 1.0V
V
GAIN
= 0.5V
Figure 31. Antialiasing Filter (AAF) Group Delay Response
06304-028
f
IN
(MHz)
2 4 6 8 10121416
–85
SECOND HARMONIC (dBFS)
–80
–75
–70
–65
–60
–55
–50
V
GAIN
= 0.2V
V
GAIN
= 0.5V
V
GAIN
= 1V
Figure 32. Second-Order Harmonic Distortion vs. Frequency, AIN = −0.5 dBFS
06304-029
THIRD HARMONIC (dBFS)
f
IN
(MHz)
2 4 6 8 1012141
–85
–80
–75
–70
–65
–60
–55
6
–50
V
GAIN
= 0.2V
V
GAIN
= 1V
V
GAIN
= 0.5V
Figure 33. Third-Order Harmonic Distortion vs. Frequency, AIN = −0.5 dBFS
06304-114
SECOND HARMONIC (dBFS)
ADC OUTPUT LEVEL (dBFS)
–110
–40
–50
–60
–70
–80
–90
–100
–40 0–5–10–15–20–25–3
0–35
V
GAIN
= 0V
V
GAIN
= 0.5V
V
GAIN
= 1V
Figure 34. Second-Order Harmonic Distortion vs. ADC Output Level
06304-115
THIRD HARMONIC (dBFS)
ADC OUTPUT LEVEL (dBFS)
–110
–40
–50
–60
–70
–80
–90
–100
–40 0–5–10–15–20–25–3
0–35
V
GAIN
= 0V
V
GAIN
= 0.5V
V
GAIN
= 1V
Figure 35. Third-Order Harmonic Distortion vs. ADC Output Level