Button bar of main window, Load and save, Update – Analog Devices UG-002 User Manual

Page 8: Reset, Reference input boxes, Reference dividers, E reference input boxes sec, Ug-002 evaluation board user guide

UG-002

Evaluation Board User Guide

Rev. 0 | Page 8 of 12

BUTTON BAR OF MAIN WINDOW

The buttons described in this section provide easy access to
common features.

Load and Save

Clicking Load and Save allows you to load and save an AD9551
setup file. A setup file (.STP) is a text file that contains the AD9551
register setup file, plus any evaluation board settings.

Update

Clicking Update toggles the I/O update bit (Register 0x05, Bit 0) of
the AD9551.

Reset

Clicking Reset resets the evaluation board and restores the
AD9551 to its default power-up state. In addition, clicking
Reset

enables the VCO calibration function by writing the

enable VCO calibration bit.

USING SOFTWARE TO CONTROL THE
FUNCTIONAL BLOCKS OF AD9551

The AD9551 evaluation software contains subsections that
correspond to the major functional blocks of the AD9551.
These subsections, most of which have their own window, are
described in this section.

You can access each window by clicking Click for Details in the
appropriate subsection box of the main window.

Most subsection boxes in the main window have a checkbox
labeled SPI. If this box is selected, the software allows serial
port writes when conditions are changed in the corresponding
subsection window.

When a subsection window closes after clicking OK, you may
notice that the LOAD button on the main window starts
blinking. This indicates that there are settings that have not
been loaded to the AD9551 evaluation board. Click LOAD to
load these settings to the evaluation board.

Reference Input Boxes

The reference input boxes, which are labeled REF A (MHz) and
REF B (MHz)

in the main window, allow you to select an input

frequency for REF A and REF B (see Figure 9 for an example for
REF A). These boxes can be used to change the logic levels of
the input frequency select pins.

-00

Figure 9. REF A List Box (in Main Window)

Reference Dividers

Clicking Click for Details in the REF A Divider and REF B
Divider

boxes of the main window accesses the RefA Input

Divider

window and the RefB Input Divider window (see

Figure 10 for an example of the RefA Input Divider window).

These windows are used to set the desired reference divider for
the integer or Σ-Δ modulator mode. The counters can be set
individually.

08129-

011

Figure 10. RefA Input Divider Window

This manual is related to the following products:

AD9551