AD9773 Analog Devices, AD9773 Datasheet - Page 36
AD9773
Manufacturer Part Number
AD9773
Description
Manufacturer
Analog Devices
Datasheet
1.AD9773.pdf
(60 pages)
Specifications of AD9773
Resolution (bits)
12bit
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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AD9773
MODULATION, INTERPOLATION = 4×
With Control Register 01h, Bit 7 and Bit 6 set to 10, the inter-
polation rate of the AD9773 is 4×. Modulation is achieved by
multiplying successive samples at the interpolation filter output
by the sequence (0, +1, 0, −1).
The Effects of the Digital Modulation on the DAC Output Spectrum Interpolation = 4×
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
Figure 67. 4x Interpolation, Modulation Disabled
Figure 68. 4x Interpolation, Modulation = f
1
1
f
f
OUT
OUT
( ×
( ×
2
2
f
f
DATA
DATA
)
)
3
3
DAC
/2
4
4
Rev. D | Page 36 of 60
Figure 67 to Figure 70 represent the spectral response of the
AD9773 DAC output with 4× interpolation in the various
modulation modes to a narrow band baseband signal.
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
Figure 69. 4x Interpolation, Modulation = f
Figure 70. 4x Interpolation, Modulation = f
1
1
f
f
OUT
OUT
( ×
( ×
2
2
f
f
DATA
DATA
)
)
3
3
DAC
DAC
/4
/8
4
4