Datasheet

AD9279
Rev. 0 | Page 14 of 44
70
68
66
64
62
60
58
56
54
52
50
0.80 0.2 0.4 0.6 1.0 1.2 1.4 1.6
GAIN+ (V)
SNR/SINAD (dBFS)
09423-011
SNR
SINAD
PGA = 21dB
PGA = 30dB
Figure 12. SNR/SINAD vs. GAIN+, AIN = −45 dBm
0
–2
–4
–6
–8
–10
–12
–14
–16
–18
0 5 10 15 20
INPUT FREQUENCY (MHz)
AMPLITUDE (dBFS)
09423-012
MODE III = 80MSPS
MODE II = 65MSPS
MODE I = 40MSPS
Figure 13. Antialiasing Filter (AAF) Pass-Band Response,
LPF Cutoff = 1 × (1/4.5) × f
SAMPLE
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
04812142 6 10 16
INPUT FREQUENCY (MHz)
SECOND-ORDER HARMONIC DISTORTION (dBFS)
09423-013
GAIN+ = 1.6V
GAIN+ = 1.0V
GAIN+ = 0.4V
Figure 14. Second-Order Harmonic Distortion vs. Frequency,
AOUT = −1.0 dBFS
0
–10
–20
–30
–40
–60
–70
–80
–50
04812142 6 10 16
INPUT FREQUENCY (MHz)
THIRD-ORDER HARMONIC DISTORTION (dBFS)
09423-014
GAIN+ = 1.6V
GAIN+ = 1.0V
GAIN+ = 0.4V
Figure 15. Third-Order Harmonic Distortion vs. Frequency, AOUT = −1.0 dBFS
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–40 –30 –20 –10 –5–35 –25 –15 0
ADC OUTPUT LEVEL (dBFS)
SECOND-ORDER HARMONIC DISTORTION (dBFS)
09423-015
GAIN+ = 1.6V
GAIN+ = 1.0V
GAIN+ = 0.4V
Figure 16. Second-Order Harmonic Distortion vs. ADC Output Level, AOUT
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–40 –30 –20 –10 –5–35 –25 –15 0
ADC OUTPUT LEVEL (dBFS)
THIRD-ORDER HARMONIC DISTORTION (dBFS)
09423-016
GAIN+ = 1.6V
GAIN+ = 1.0V
GAIN+ = 0.4V
Figure 17. Third-Order Harmonic Distortion vs. ADC Output Level