Datasheet

AD9775
Rev. E | Page 40 of 56
–100
–80
–60
–40
–20
0
0–2.0–6.0 –4.0–8.0 2.0 4.0 6.0 8.0
(LO)
f
OUT
(× f
DATA
)
DA B C DA B C
02858-085
Figure 85. 8× Interpolation, Complex f
DAC
/4 Modulation
–
100
–80
–60
–40
–20
0
0–0.5–1.5 –1.0–2.0 0.5 1.0 1.5 2.0
(LO)
f
OUT
(× f
DATA
)
DA B CD A BC
02858-086
Figure 86. 2× Interpolation, Complex f
DAC
/8 Modulation
–100
–80
–60
–40
–20
0
0–1.0–3.0 –2.0–4.0 1.0 2.0 3.0 4.0
(LO)
f
OUT
(× f
DATA
)
DA B CD A B C
02858-087
Figure 87. 4× Interpolation, Complex f
DAC
/8 Modulation
–100
–80
–60
–40
–20
0
0–2.0–6.0 –4.0–8.0 2.0 4.0 6.0 8.0
(LO)
f
OUT
(× f
DATA
)
DA DABC BC
02858-088
Figure 88. 8× Interpolation, Complex f
DAC
/8 Modulation
01020304050
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
AMPLITUDE (dBm)
FREQUENCY (MHz)
02858-089
Figure 89. AD9775 Real DAC Output of Complex Input Signal Near Baseband
(Positive Frequencies Only), Interpolation = 4×, No Modulation in AD9775
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
AMPLITUDE (dBm)
750 760 770 780 790 800 810 820 830 840 850
FREQUENCY (MHz)
02858-090
Figure 90. AD9775 Complex Output from
Figure 89,
Now Quadrature Modulated by AD8345 (LO = 800 MHz)