AD9775EB datasheet(28/48 Pages) AD

No de pièce	AD9775EB

Description	14-Bit, 160 MSPS 2X/4X/8X Interpolating Dual TxDAC D/A Converter

PDF	48 Pages

Scroll/Zoom	100%

Fabricant	AD [Analog Devices]

Site Internet	http://www.analog.com

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28 / 48 page

REV. 0

AD9775

–28–

fOUT ( fDATA)

–100

–80

–60

–40

–20

Figure 27a. 4

× Interpolation, Modulation Disabled

fOUT ( fDATA)

–100

–80

–60

–40

–20

Figure 27b. 4

× Interpolation, Modulation = fDAC/2

fOUT ( fDATA)

–100

–80

–60

–40

–20

Figure 27c. 4

× Interpolation, Modulation = fDAC/4

fOUT ( fDATA)

–100

–80

–60

–40

–20

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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