AD9773-EB datasheet(36/60 Pages) AD

Part #	AD9773-EB

Description	12-Bit, 160 MSPS, 2x/4x/8x Interpolating Dual TxDAC D/A Converter

PDF	60 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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36 / 60 page

AD9773

Rev. D | Page 36 of 60

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).

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.

The Effects of the Digital Modulation on the DAC Output Spectrum Interpolation = 4×

–100

–80

–60

–40

–20

fOUT (×fDATA)

Figure 67. 4x Interpolation, Modulation Disabled

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–60

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fOUT (×fDATA)

Figure 68. 4x Interpolation, Modulation = fDAC/2

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fOUT (×fDATA)

Figure 69. 4x Interpolation, Modulation = fDAC/4

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–80

–60

–40

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fOUT (×fDATA)

Figure 70. 4x Interpolation, Modulation = fDAC/8

AD9773-EB Datasheet(PDF) 36 Page - Analog Devices