Texas Instruments DAC8580, User Manual

Page: 16 / 23

Using the DAC8581EVM with DXP
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The DXP software defaults to output a 1-kHz sine wave from the DAC. Other waveform options include
square, sawtooth, triangle, and dc output options, as described in the
DXP User's Guide . The frequency
and amplitude of the output waveform are controlled by sliders on the DXP software interface. GPIO
options are available on the DAC8581EVM that will activate the MUTEB function of the DAC8581. The
DAC update rate and GPIO controls can also be modified, as shown in
Figure 15 .
Figure 15. DAC8581EVM: Frequency/Amplitude and Update Rate Adjustments
Table 6. DAC8581EVM: GPIO Options
Function Detailed Description
The MUTEB button controls the CLR pin of the DAC8581. By
default, the button is active, causing CLR to be high and in
normal operating mode. Pressing the button places logic low on
pin J2.14 of the DAC8581EVM. When the CLR pin is low, the
MUTEB device is in clear mode. The output displays 0V and does not
update. Pressing MUTEB a second time returns the CLR pin to
its inactive state. The device is in normal operating mode. To
use this function, ensure that no jumpers are placed on W16 or
J2 pin 14.
16 DAC8580/81 Evaluation Module SLAU173A – December 2005 – Revised November 2009
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