AD9775 datasheet(34/56 Pages) AD

Part #	AD9775

Description	14-Bit, 160 MSPS, 2횞/4횞/8횞 Interpolating Dual TxDAC짰 Digital-to-Analog Converter

PDF	56 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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34 / 56 page

AD9775

Rev. E | Page 34 of 56

MODULATION, INTERPOLATION = 4×

With Control Register 0x01, Bit 7 and Bit 6 set to 10, the

interpolation 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).

Figure 67 through Figure 70 represent the spectral response of

the AD9775 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×

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fOUT (×fDATA)

Figure 67. 4× Interpolation, Modulation Disabled

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fOUT (×fDATA)

Figure 68. 4× Interpolation, Modulation = fDAC/4

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fOUT (×fDATA)

Figure 69. 4× Interpolation, Modulation = fDAC/2

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fOUT (×fDATA)

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

AD9775 Datasheet(PDF) 34 Page - Analog Devices