Datasheet

CH0

CH1

CH2

CH3

DAC0

DAC1

DAC2

DAC3

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GUI Software and Operating Descriptions

To implement such a test, the connection from the AMC7812 DAC output to the AMC7812 ADC input

should be made as shown by Figure 12. In this example, the upper four DAC outputs were looped back to

the upper four ADC channel inputs Ch0 to Ch3.

CAUTION

For the analog loopback test, the DAC signal range must be within the ADC

input range.

Figure 12. Connections on AMC7812EVM Board for Running Analog Loopback Test

After making the appropriate connections as illustrated in Figure 12 (in addition to making appropriate

grounding connections), start the AMC7812EVM-PDK software. Using the AMC7812EVM-PDK software,

first navigate to the DAC output on the DAC channels tab, and complete the following procedures.

• Power up the internal reference by clicking on the Internal REF Power button

• Under DAC Settings, turn on the power by clicking the Power button

• Write power on to all of the DAC registers by clicking the write button to the right of the DAC Settings

pane with All DACs selected.

• Write 0x1111 to DAC0 by typing 1111 to the Write DAC Data field in the DAC Data pane

• Click the pull-down menu next to Apply Settings to: and select DAC1

• Repeat writing data to the DAC output, but enter 2222 for DAC1

• Click the pull-down menu next to Apply Settings to: and select DAC2

• Repeat writing data to the DAC output, but enter 3333 for DAC2

• Click the pull-down menu next to Apply Settings to: and select DAC3

• Repeat writing data to the DAC output, but enter 4444 for DAC3

SBAU177A–September 2010–Revised May 2013 AMC7812EVM-PDK User’s Guide

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