Datasheet

AD9042
Rev. B | Page 9 of 24
POWER RELATIVE TO ADC FULL SCALE (dB)
ENCODE = 41MSPS
AIN = 15.3MHz, 19.5MHz
FREQUENCY (MHz)
0
–80
–120
–40
–100
–20
–60
dc 4.1 8.2 12.3 16.4 20.5
00554-019
Figure 9. Two Tones at 15.3 MHz and 19.5 MHz
SAMPLE RATE (MSPS)
05cd5
SNR (dB), WORST-CASE SPURIOUS (dBc)
10 15 20 25 30 35 40 45
80
70
65
60
75
SNR
85
AIN = 4.3MHz
WORST SPUR
0
0554-022
Figure 10. SNR, Worst Harmonic vs. Encode
ENCODE DUTY CYCLE (%)
SNR (dB), WORST-CASE SPURIOUS (dBc)
90
65
55
45
75
85
80
70
60
50
40
35
30
ENCODE = 41MSPS
AIN = 19.5MHz
WORST SPUR
SNR
25 30 35 40 45 50 55 60 65 70 75
00554-023
Figure 11. SNR, Worst Spurious vs. Duty Cycle
4
POWER RELATIVE TO ADC FULL SCALE (dB)
FREQUENCY (MHz)
0
–80
–120
–40
–100
–20
–60
dc 4.1 8.2 12.3 16.4 20.5
ENCODE = 41MSPS
AIN = BROADBAND_NOISE
00554-024
Figure 12. NPR Output Spectrum
ENCODE = 41MSPS
AIN = 19.5MHz @ –29dBFS
NO DITHER
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
00554-025
Figure 13. 4K FFT Without Dither
ANALOG INPUT POWER LEVEL (dBFS)
WORST-CASE SPURIOUS (dBc)
ENCODE = 41MSPS
AIN = 19.5MHz
NO DITHER
SFDR = 80dB
REFERENCE LINE
100
0
90
60
40
20
10
80
70
50
30
0–10–20–30–40–50–60–70–80
00554-026
Figure 14. SFDR Without Dither