UG-077
Evaluation Board User Guide
Rev. 0 | Page 12 of 16
OUTPUT DRIVER WINDOW
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Figure 21. AD9522 Output Driver Window
The output driver window shown in Figure 21 is accessed by
clicking any of the numbered triangular output driver symbols
on the right side of the main window (see Figure 22).
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Figure 22. Driver Symbol
It is important to power down unused outputs on the evaluation
board because they can be a major source of unwanted spurs.
LVDS and CMOS outputs have different termination require-
ments, and OUT9 through OUT11 have been terminated
differently from OUT0 through OUT8.
OUT0 through OUT8 are ac-coupled, and this termination
scheme is ideal for LVDS drivers. However, this scheme may
degrade CMOS driver performance.
OUT9 though OUT11 have no termination resistors and are
ideally configured for CMOS operation. To use these drivers in
LVDS mode, the 0 Ω resistors should be replaced with 0.1 μF
capacitors.
DEBUG WINDOW
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Figure 23. AD9522 Debug Window
The debug window shown in Figure 23 is accessed by clicking
Debug
from the
View
menu on the main window (see Figure 24).
The
Serial I/O
section of this window is a convenient way to
read and write registers directly.
