Analog Devices AD9273 Manual page 18

150
125
100
GAIN+ = 1.6V
75 GAIN+ = 0.8V
GAIN+ = 0V
50
25
0
0 5 10 15
FREQUENCY (MHz)
Figure 18. Antialiasing Filter (AAF) Group Delay Response
0
–10
–20
–30
–40
–50
GAIN+ = 0.5V
–60
–70
–80
GAIN+ = 1.0V
–90
–100
0 2 4 6
INPUT FREQUENCY (MHz)
Figure 19. Second-Order Harmonic Distortion vs. Input Frequency,
AIN = −1.0 dBFS
0
–10
–20
–30
–40
GAIN+ = 1.6V
–50
–60
–70
GAIN+ = 1.0V
–80
0 2 4 6
INPUT FREQUENCY (MHz)
Figure 20. Third-Order Harmonic Distortion vs. Input Frequency,
AIN = −1.0 dBFS
20 25 30 35 40
GAIN+ = 1.6V
8 10 12 14 16
GAIN+ = 0.5V
8 10 12 14 16
Rev. B | Page 17 of 48
0
–20
–40
–60
GAIN+ = 0V
GAIN+ = 1.6V
–80
–100
–120
–40 –35 –30 –25
ADC OUTPUT LEVEL (dBFS)
Figure 21. Second-Order Harmonic Distortion vs. ADC Output Level
0
–20
–40
GAIN+ = 0V
–60
–80
–100
–120
–40 –35 –30 –25 –20
ADC OUTPUT LEVEL (dBFS)
Figure 22. Third-Order Harmonic Distortion vs. ADC Output Level
0
f f
= + 0.01MHz
IN1 IN2
–10
A 1 = –1dBFS, A 2 = –21dBFS
IN IN
–20
–30
–40
–50
–60
–70
–80
–90
0.5 0.6 0.7 0.8 0.9 1.0
GAIN+ (V)
Figure 23. IMD3 vs. GAIN+
AD9273
GAIN+ = 0.8V
–20 –15 –10 –5 0
GAIN+ = 0.8V
GAIN+ = 1.6V
–15 –10 –5 0
5MHz
8MHz
2.3MHz
1.1 1.2 1.3 1.4 1.5 1.6