Datasheet

EVAL-AD7294
Rev. 0 | Page 16 of 24
An external offset can be applied to a particular DAC by
clicking External Offset at the bottom of the Load DAC
window. The External Offset box then opens on the right side
of the Load DAC window. You can select an offset of greater
in the
x
required via Terminal
J3.3. For more details, refer to the AD7294 data sheet.
LOAD DAC WINDOW
The DAC tab in the main window contains only one option,
Load DAC Channel. The Load DAC window allows you to
select any of the four DAC outputs and then load a value, using
the gauge on the left side of the window (see Figure 26). All four
DACs can be loaded simultaneously. Note that the DAC output
is twice the reference voltage when no offset is applied.
than or equal to 1.67 V. The resulting DAC output shown
Plot box is given by
V
OUT
= 3V
OFFSET
− 5 + V
DAC
Figure 27 shows an external voltage of 2.0 V being applied to
DAC1. As a result, the DAC1 output is approximately 3.5 V, as
determined by the previous formula and shown in the Plot bo
of Figure 27. Make sure to select the appropriate check box in the
External Offset box in this window to load the offset. In addition,
note that if an offset voltage is applied to the OFFSET IN x pin
to achieve DAC output voltages in excess of 5 V, an external
DAC_OUTPUT_V+ of up to 16.5 V is
0
7922-026
Figure 26. Load DAC Window
0
7922-027
Figure 27. External Offset in Load DAC Window