Datasheet

AD9272
Rev. C | Page 17 of 44
0
25
50
75
100
125
150
0 5 10 15 20 25 30 35 40
GROUP DELAY (ns)
FREQUENCY (MHz)
GAIN+ = 1.6V
GAIN+ = 0.8V
GAIN+ = 0V
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Figure 17. Antialiasing Filter (AAF) Group Delay Response
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
024681012141
SECOND-ORDER H
6
A
RMONIC DISTORTION (dBFS)
INPUT FREQUENCY (MHz)
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GAIN+ = 1.6V
GAIN+ = 1.0V
GAIN+ = 0.4V
Figure 18. Second-Order Harmonic Distortion vs. Frequency, AIN = −1 dBFS
–80
–70
–60
–50
–40
–30
–20
–10
0
024 681012141
THIRD-ORDE
6
R
H
A
RMONIC DISTORTION (dBFS)
INPUT FREQUENCY (MHz)
GAIN+ = 1.6V
GAIN+ = 1.0V
GAIN+ = 0.4V
07029-123
Figure 19. Third-Order Harmonic Distortion vs. Frequency, AIN = −1 dBFS
–120
–100
–80
–60
–40
–20
0
–50 –40 –30 –20 –10 0
SECOND-ORDER H
A
RMONIC DISTORTION (dBFS)
ADC OUTPUT LEVEL (dBFS)
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GAIN+ = 1.6V
GAIN+ = 0.8V
GAIN+ = 0V
Figure 20. Second-Order Harmonic Distortion vs. ADC Output
–120
–100
–80
–60
–40
–20
0
–40 –35 –30 –25 –20 –15 –10 –5 0
THIRD-ORDER H
A
RMONIC DISTORTION (dBFS)
ADC OUTPUT LEVEL (dBFS)
GAIN+ = 1.6V
GAIN+ = 0.8V
GAIN+ = 0V
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Figure 21. Third-Order Harmonic Distortion vs. ADC Output Level
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
0.4 0.6 0.8 1.0 1.2 1.4 1.6
IMD3 (
d
BFS)
GAIN+ (V)
8MHz
2.3MHz 5MHz
f
IN2
= f
IN1
+0.01MHz
A
IN1
= –1dBFS, A
IN2
= –21dBFS
07029-126
Figure 22. IMD3 vs. GAIN+