Texas Instruments TLV320AIC26EVM, User Manual, Page: 30 / 46

Program Description
3-14
J
Average/Median
There are two ways to reduce noise effect to the ADC result. One is aver-
aging where 2, 4, 8, or 16 readings are averaged, and another option is to
find the median value among 5, 9, or 15 readings.
3.5.2.2 Reference Section
For all nonaudio A/D functions, a reference voltage is needed for the A/D con-
verter. Figure 3−4 shows this section with the AIC26’s internal reference cho-
sen. This reference voltage can be set to either 1.25 V or 2.5 V.
The internal reference powers down between conversions to save power. Us-
ing the Powered at all times checkbox, this can be overridden and the refer-
ence does not power down. If the reference is allowed to power down, the
AIC26 then must allow a delay time for the reference to power up when a con-
version is to take place. This delay time can be set using the slider in this sec-
tion.
If an external reference is to be used, it can be selected as shown in
Figure 3−5. The value of the external reference should be entered in the text
box shown.
Figure 3−5. Configuration Screen With External Reference Selection