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AD9866
TxDAC PATH TYPICAL PERFORMANCE CHARACTERISTICS
AVDD = CLKVDD = DVDD = DRVDD = 3.3 V, fOSCIN = 50 MSPS and 80 MSPS, RSET = 1.96 kΩ, 2:1 transformer coupled output
(see Figure 63) into 50 Ω load half-or full-duplex interface, default power bias settings.
10
0
–10
–20
–30
–40
–50
–60
–70
–80
0
5
FREQUENCY (MHz)
Figure 27. Dual-Tone Spectral Plot of TxDAC's Output
(f
= 50 MSPS, 4× Interpolation, 10 dBm Peak Power,
DATA
F1 = 17 MHz, F2 = 18 MHz)
–65
–70
–75
–80
–85
–90
0
2.5
5.0
7.5
2-TONE CENTER FREQUENCY (MHz)
Figure 28. 2-Tone IMD Frequency Sweep vs. Peak Power
with f
= 50 MSPS, 4× Interpolation
DATA
–65
–70
–75
10dBm
–80
–85
–90
0
2.5
5.0
7.5
2-TONE CENTER FREQUENCY (MHz)
Figure 29. 2-Tone Worst Spur Frequency Sweep vs. Peak Power
with f
= 50 MSPS, 4× Interpolation
DATA
10
15
20
25
4dBm
7dBm
10dBm
10.0
12.5
15.0
17.5
20.0
4dBm
7dBm
10.0
12.5
15.0
17.5
20.0
10
0
–10
–20
–30
–40
–50
–60
–70
–80
0
Figure 30. Dual-Tone Spectral Plot of TxDAC's Output
(f
= 80 MSPS, 2× Interpolation, 10 dBm Peak Power,
DATA
–65
–70
–75
–80
–85
–90
0
Figure 31. 2-Tone IMD Frequency Sweep vs. Peak Power
–65
–70
–75
–80
–85
–90
0
Figure 32. 2-Tone Worst Spur Frequency Sweep vs. Peak Power
Rev. A | Page 16 of 48
5
10
15
20
25
FREQUENCY (MHz)
F1 = 27.1 MHz, F2 = 28.7 MHz)
10dBm
4dBm
5
10
15
20
2-TONE CENTER FREQUENCY (MHz)
with f
= 80 MSPS, 2× Interpolation
DATA
10dBm
4dBm
7dBm
5
10
15
20
2-TONE CENTER FREQUENCY (MHz)
with f
= 80 MSPS, 2× Interpolation
DATA
30
35
40
7dBm
25
30
25
30
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