UG-1698
Rev. 0 | Page 14 of 23
4.
Note the line rate frequency from the
in the
DPGDownloader
window as 6.75 Gbps, as shown in
SYNC Status
indicator then changes to the
green check mark (not shown in Figure 15). An 800 MHz
single tone appears on the spectrum analyzer, as shown in
Figure 14.
5.
In the
NCO Configuration
section, select the
NCO
Enable
box.
223
24-
01
3
Figure 13. NCO Enabled
6.
Set the
Frequency Shift
field to the desired shift frequency
(in Hz).
7.
Change the
DC Back-Off(dB)
box to 0 dB. This step
causes the fundamental tone at 800 MHz to shift by the
amount determined in the
Frequency Shift
field.
8.
Click the download button in the bottom right of the
DPGDownloader
window (see Figure 11) to allow the
DPGDownloader
to create and redownload the new
vector. The redownload may momentarily bring the
JESD204B link down. However, the link recovers and
resynchronizes, and the new output frequency displays on
the spectrum analyzer.
22324-
014
Figure 14. Spectrum Analyzer Plot of DAC Output in JESD204B Eight-lane, 1× Interpolation Mode, Showing Single Tone at 800 MHz
