Datasheet

AD9042
Rev. B | Page 10 of 24
ANALOG INPUT POWER LEVEL (dBFS)
WORST-CASE SPURIOUS (dBc)
100
0
90
60
40
20
10
80
70
50
30
0–10–20–30–40–50–60–70–80
ENCODE = 41MSPS
AIN = 19.5MHz
DITHER = –32.5dBm
SFDR = 80dB
REFERENCE LINE
00554-029
ENCODE = 41MSPS
AIN = 2.5MHz @ –26dBFS
NO DITHER
FREQUENCY (MHz)
0
–80
–120
–40
–100
–20
–60
POWER RELATIVE TO ADC FULL SCALE (dB)
dc 4.1 8.2 12.3 16.4 20.5
00554-027
Figure 15. 128K FFT Without Dither Figure 17. SFDR with Dither
FREQUENCY (MHz)
0
–80
–120
–40
–100
–20
–60
POWER RELATIVE TO ADC FULL SCALE (dB)
dc 4.1 8.2 12.3 16.4 20.5
ENCODE = 41MSPS
AIN = 2.5MHz @ –26dBFS
DITHER = –32.5dBm
00554-030
2 4 6 8 8 7 5 3
FREQUENCY (MHz)
0
–80
–120
–40
–100
–20
–60
POWER RELATIVE TO ADC FULL SCALE (dB)
dc 4.1 8.2 12.3 16.4 20.5
00554-028
ENCODE = 41MSPS
AIN = 19.5MHz @ –29dBFS
DITHER = –32.5dBm
Figure 16. 4K FFT with Dither Figure 18. 128K FFT with Dither