AD9775EB View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
AD9775EB Datasheet PDF : 48 Pages
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AD9775
MODULATION, INTERPOLATION = 4×
With Control Register 01h, Bits 7 and 6 set to “10,” the inter-
polation rate of the AD9775 is 4×. Modulation is achieved by
multiplying successive samples at the interpolation filter output
by the sequence (0, 1, 0, –1). Figures 27a–27d represent the
spectral response of the AD9775 DAC output with 4× interpo-
lation in the various modulation modes to a narrow band
baseband signal.
0
0
–20
–20
–40
–40
–60
–60
–80
–100
0
1
2
3
4
fOUT (؋fDATA)
Figure 27a. 4 × Interpolation, Modulation Disabled
0
–80
–100
0
1
2
3
4
fOUT (؋fDATA)
Figure 27c. 4 × Interpolation, Modulation = fDAC/4
0
–20
–20
–40
–40
–60
–60
–80
–80
–100
0
1
2
3
4
fOUT (؋fDATA)
Figure 27b. 4 × Interpolation, Modulation = fDAC/2
–100
0
1
2
3
4
fOUT (؋fDATA)
Figure 27d. 4 × Interpolation, Modulation = fDAC/8
Figure 27. Effect of Digital Modulation on DAC Output Spectrum, Interpolation = 4 ×
–28–
REV. 0
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