Texas Instruments AMC7834, User Manual, Page: 15 / 32

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AMC7834EVM Software Overview
15 SLAU608B – December 2014 – Revised May 2016
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AMC7834 Evaluation Module
Figure 12. ADC Page
To completely activate the ADC block, the Powerdown Mode option must be set for reference
configuration. The Powerdown Mode option changes the POWER-MODE bits of the Device Configuration
Register , 0x02. The Powerdown Mode allows the user to configure the ADC block to use the internal
reference of the device or an external reference. The reference selection should adhere to the Reference
Configuration Options , listed in Table 7 . The EVM is currently configured to use the o2.5-V
reference. Figure 13 displays the options for internal or external reference operation. These options can
be selected in the Powerdown Mode drop-down menu illustrated in Table 14 . For default EVM operation,
select Power Mode “11” to use the o2.5-V supply.
Table 14. ADC Block Reference Selection
Power Mode ADC Ref Buffer Description
0X OFF ADC block powered off
10 ON Configured for internal reference
11 OFF Configured for external reference
Figure 13. Powerdown Mode Reference Selection
Once the POWER-MODE is configured, individual channels can be enabled by selecting their respective
ADC MUX button, as shown in Figure 14 . Selecting a channel enables the button’s respective indicator
field for register readout. To view the contents of the read in volts, select Display ADC Value in Volts .