Datasheet

AD9278 Data Sheet
Rev. A | Page 14 of 44
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0.80 0.2 0.4 0.6 1.0 1.2 1.4 1.6
GAIN+ (V)
SNR/SINAD (dBFS)
09424-011
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
02468101214161820
FREQUENCY (MHz)
AMPLITUDE (dBFS)
09424-012
MODE III = 50MSPS
MODE II = 25MSPS
MODE I = 40MSPS
Figure 13. Antialiasing Filter (AAF) Pass-Band Response,
LPF Cutoff = 1 × (1/3) × f
SAMPLE
0
–10
–20
–30
–40
–50
–60
–70
–80
04812142 6 10 16
INPUT FREQUENCY (MHz)
SECOND-ORDER HARMONIC DISTORTION (dBFS)
09424-013
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)
09424-014
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
–100
–110
–120
–40 –30 –20 –10 –5–35 –25 –15 0
ADC OUTPUT LEVEL (dBFS)
SECOND-ORDER HARMONIC DISTORTION (dBFS)
09424-015
GAIN+ = 1.4V
GAIN+ = 0.8V
Figure 16. Second-Order Harmonic Distortion vs. ADC Output Level, AOUT
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–40 –30 –20 –10 –5–35 –25 –15 0
ADC OUTPUT LEVEL (dBFS)
THIRD-ORDER HARMONIC DISTORTION (dBFS)
09424-016
GAIN+ = 1.4V
GAIN+ = 0.8V
Figure 17. Third-Order Harmonic Distortion vs. ADC Output Level