DAC39RF10 datasheet(195/232 Pages) TI2

195 / 232 page

Normalized Frequency (/FCLK)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

-80

-70

-60

-50

-40

-30

-20

-10

DES2XL

DES2XH

Figure 9-1. DES Interpolator Frequency Response

A non-50% CLK duty cycle results in an image of the signal at FCLK - FOUT. The amplitude of the image in

DES2XL/H modes compared to NRZ/RF modes is shown in Figure 9-2. DES2XL provides 30+dB suppression

over NRZ mode and DES2XH 20 to 30 B suppression over RF mode. This reduces the analog filtering required

after the DAC to remove the unwanted images.

Output Frequency (GHz)

-80

-70

-60

-50

-40

-30

-20

-10

RF Mode Image

NRZ Mode Image

DES2XH

DES2XL

Figure 9-2. DES2XL/H Image compare to NRZ and RF Modes

The input clock frequency and input data rate is the same for NRZ, RF, RTZ, DES2XL and DES2XH modes -

only the output waveform generated by the DAC is changed (See Section 7.3.1). Changing between modes only

requires a different setting of the MXMODE register.

Figure 9-3 shows a comparison of DES2XL and NRZ mode for a fullscale tone at 3497MHz with 10GSPS

clock frequency. In addition to the reduction of the image at FCLK - FOUT = 6743MHz, DES2XL mode can also

suppress harmonics that in NRZ mode fold back below FCLK/2. In the plot, HD2 has an image at 3006MHz

that is -65dBc in NRZ mode and -80dBc in DES2XL mode. Likewise, the HD3 image at 491MHz improves from

-70dBc in NRZ mode to better than -90dBc in DES2XL mode. SFDR between 0 and FCLK/2 is limited by HD2

and therefore improves from 65 to 80dBc. Note that the non-linearity specifications for DES2XL mode in Section

6 are measured between 0 to FCLK/2 (as is NRZ mode), and for DES2XH mode between FCLK/2 and FCLK.

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DAC39RF10-SP, DAC39RF10-SEP

DAC39RFS10-SP, DAC39RFS10-SEP

SBAS932A – MARCH 2024 – REVISED FEBRUARY 2026

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