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AD9775EB датащи(PDF) 28 Page - Analog Devices |
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AD9775EB датащи(HTML) 28 Page - Analog Devices |
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28 / 48 page ![]() REV. 0 AD9775 –28– fOUT ( fDATA) 01 –100 0 –80 –60 –40 –20 23 4 Figure 27a. 4 × Interpolation, Modulation Disabled fOUT ( fDATA) 01 –100 0 –80 –60 –40 –20 23 4 Figure 27b. 4 × Interpolation, Modulation = fDAC/2 fOUT ( fDATA) 01 –100 0 –80 –60 –40 –20 23 4 Figure 27c. 4 × Interpolation, Modulation = fDAC/4 fOUT ( fDATA) 01 –100 0 –80 –60 –40 –20 23 4 Figure 27d. 4 × Interpolation, Modulation = fDAC/8 Figure 27. Effect of Digital Modulation on DAC Output Spectrum, Interpolation = 4 × 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. |
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