Datasheet

V =
DAC_CHANNEL
V x Code_in_decimal
1024
S
www.ti.com BUF22821EVM-USB Software Overview
When JMP5 and the software are set as shown in Figure 18, the second I
2
C address can be configured.
Figure 18. JMP5 Setting for Logic ‘1’
6.2.2 Measuring the Power Supply
You must measure the power supply (V
S
) with respect to the GND on the BUF22821 Test Board and enter
it in the Vsup field located in the top section of the software interface as shown in Figure 19.
Figure 19. Measuring and Entering Power-Supply Voltage
The voltage out of each digital-to-analog converter (DAC) is calculated according to the V
S
value entered.
Changing the value in the channel 6 cell as shown below, for instance, immediately changes the output of
channel 6 to 0.996 V. The calculation is performed according to Equation 3.
(3)
19
SBOU117–September 2011 BUF22821EVM-USB Evaluation Board and Software Tutorial
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