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2.2
DAC5687 Initial Setup Tests
DAC5687 EVM Operational Procedure
There are several initial tests with the DAC5687 that can be done without any input data. The following
setup steps are suggested to familiarize the user with the DAC5687 and EVM software and verify that the
DAC5687 is functioning properly.
1. Provide a CLK2 input if the PLL is disabled or a CLK1 input if the PLL is enabled (W3). Do not provide
parallel input data.
2. Power up EVM with 1.8V DVDD and 3.3V AVDD
3. Start DAC5687_SPI software.
4. Click on the "Load Regs" button on the GUI. A new directory window will open. Click on the file called
"User Guide Test.reg5687". Click on "OK". This will load a test setting for the DAC, corresponding to
F
NCO
/12.5 = 20 MHz for CLK2 = 500 MSPS (F
NCO
= F
DAC
/2 for X4L mode). The GUI should now look
as shown in
.
Figure 2. DAC5687 Setup for X4L Mode and NCO Tone at F
DAC
/25
SLWU017B – APRIL 2005 – Revised March 2007
DAC5687 EVM
11
