AD9775 Analog Devices, AD9775 Datasheet - Page 40
AD9775
Manufacturer Part Number
AD9775
Description
Manufacturer
Analog Devices
Datasheet
1.AD9775.pdf
(56 pages)
Specifications of AD9775
Resolution (bits)
14bit
Dac Update Rate
400MSPS
Dac Settling Time
11ns
Max Pos Supply (v)
+3.5V
Single-supply
Yes
Dac Type
Current Out
Dac Input Format
Par
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AD9775
–100
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
–2.0
–8.0
–4.0
D
D A
Figure 85. 8× Interpolation, Complex f
Figure 86. 2× Interpolation, Complex f
Figure 87. 4× Interpolation, Complex f
D
–1.5
–6.0
–3.0
A
A
–1.0
–4.0
–2.0
B
–2.0
B
–0.5
–1.0
B
f
f
f
OUT
OUT
OUT
C
(LO)
C D
(LO)
C D
(LO)
(×
(×
(×
0
0
0
f
f
f
DATA
DATA
DATA
D
)
)
)
A
0.5
2.0
1.0
A
A
DAC
DAC
DAC
1.0
4.0
2.0
/4 Modulation
/8 Modulation
/8 Modulation
B
B
1.5
6.0
3.0
B
C
C
C
2.0
8.0
4.0
Rev. E | Page 40 of 56
Figure 89. AD9775 Real DAC Output of Complex Input Signal Near Baseband
(Positive Frequencies Only), Interpolation = 4×, No Modulation in AD9775
–100
–20
–40
–60
–80
–100
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
–8.0
0
0
750
0
D A
Now Quadrature Modulated by AD8345 (LO = 800 MHz)
Figure 88. 8× Interpolation, Complex f
Figure 90. AD9775 Complex Output from Figure 89,
–6.0
760
770
10
–4.0
780
–2.0
FREQUENCY (MHz)
FREQUENCY (MHz)
f
790
OUT
B C
20
(LO)
(×
0
800
f
DATA
D A
)
810
2.0
30
820
DAC
4.0
/8 Modulation
830
40
6.0
840
B C
8.0
850
50