EVAL-AD7484_15 Datasheet, PDF (9/20 Pages) Analog Devices – Evaluation Board for 3 MSPS, 14-Bit SAR ADC

The middle third of the main window contains a digital storage
oscilloscope (DSO) that displays samples uploaded from the
EVAL-CONTROL BRD2. The samples can be displayed either
as integer values or as voltages (determined by the input range
of the device in question). When samples are displayed, clicking
any point in the graph displays the sample number and the
value of the point directly beneath the cursor. Along the axis of
the graph are zoom handles that allow the user to zoom in and
out to get a closer look at a sample. When another set of
samples is taken, the graph attempts to display all values
collected unless the Hold Zoom check box is selected. In this
case, the graph keeps the same axis settings as for the previous
set of data samples. Additional check boxes are provided to give
EVAL-AD7484
the user control over the vertical and horizontal grids and data
points.
The lower third of the window contains either a Fast Fourier
Transform (FFT) of the data or a histogram that displays the
number of occurrences of each code read back. The FFT
(default option) is typically used to show an ADC’s perform-
ance in the frequency domain, while the histogram gives an
indication of the ADC’s performance with DC signals. The
option displayed can be toggled by clicking the FFT Mode/
Histogram Mode button at the top right of the window. Figure 4
shows how the main window looks when histogram mode is
selected.
Figure 4. AD7484 Main Window – Histogram Mode
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