Datasheet

EVAL-AD7294
Rev. 0 | Page 12 of 24
READ CHANNEL WINDOW
To read the converted analog signals from the 9-channel ADC,
select Read Channel in the ADC menu of the main window.
The Read Channel window appears, allowing you to select
which channel to access by clicking one of the nine tabs at the top
of the window. There are two methods of reading the converted
data. Clicking Read Single Value adds one value at a time to a
list, whereas clicking Start Scope results in the values being
stored in an array to draw the scope plot. Various user options
are also available in this window (see Figure 18).
The differential mode can be selected for Channel 1 to Channel 4
(V
IN
0 to V
IN
3). This mode allows analog input signals on Channel 1
and Channel 2 to become a differential input pair and input signals
on Channel 3 and Channel 4 to form another differential pair.
In addition, in differential mode it is possible to use the input
channels in pseudo-differential mode when an offset from ground
is provided on one of the differential inputs, thus enabling the
advantage of canceling common-mode voltages.
To zoom in on a signal in the plot, use the arrows in the corners
of the graphing tool (circled in blue in Figure 18). To activate the
DATA
HIGH
and DATA
LOW
functions and the hysteresis functions,
click the arrow in the top left of the window (circled in red in
Figure 18). Two tab options appear on the right side of the
window: the Limits tab and the Vre f tab. With the Limits tab
selected, you can set up predetermined limits for the converted
input signals. The alert bit is flagged and the relative bit in the
alert status register is triggered when the input signal becomes
greater than the DATA
HIGH
limit or less than the DATA
LOW
limit.
Note that the alert bit does not turn off until the signal is within
the specified hysteresis limits (see the circled signal in Figure 19).
To benefit from this option, you must click Alert Manager at
the lower right of the window or select the Alert Manager from
the ADC menu in the main window of the evaluation software.
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Figure 18. Read Channel Window
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Figure 19. Data Limit Function