EVAL-AD7912_15 Datasheet, PDF (7/16 Pages) Analog Devices – Evaluation Board for 1 MSPS, 2-Channel, 12-/10-Bit ADCs

EVALUATION BOARD SOFTWARE
MENU BAR
CONTROL
BUTTONS
DIGITAL
STORAGE
OSCILLOSCOPE
(DSO) 1
EVAL-AD7912/AD7922
SELECTION WINDOWS
BUSY
STATUS
DIGITAL
STORAGE
OSCILLOSCOPE
(DSO) 2
Figure 4. AD7912/AD7922 Main Dialog Box
SOFTWARE DESCRIPTION
Included in the EVAL-AD7912/AD7922 evaluation board
package is a CD-ROM that contains software for controlling
and evaluating the performance of the AD7912/AD7922 when
it is operated with the EVAL-CONTROL-BRD2. When the CD
is inserted into the PC, an installation program automatically
begins. This program installs the evaluation software, the data
sheet for the AD7912/AD7922 evaluation board, and the data
sheet for the AD7912/AD7922 onto the user’s machine. All
literature on the CD is in Adobe’s Portable Documentation
format (PDF) and requires Acrobat Reader™ to be viewed or
printed. The user interface on the PC is a dedicated program
written especially for the AD7912/AD7922.
The software that controls the EVAL-CONTROL-BRD2, and
hence the AD7912/AD7922 evaluation board, has three main
dialog boxes. The box shown in Figure 4 appears when the
software is run. The primary function of the box is to allow the
user to read a predetermined number of samples from the
evaluation board and display them in both the time and
frequency domain. The box can be divided into three sections. The
upper most section of the box contains the control buttons, the
menu bar, and the status windows. The control buttons allow the
user to take samples, reset the part, and quit the program. There
are also power-down and power-up options in the control buttons.
These buttons allow the user to place the part into power-down
mode, and then to power up the part again (see the AD7912/
AD7922 data sheet for more information). The menu bar allows
the user to enter the setup menu, select which printer port is to
be used to control the EVAL-CONTROL-BRD2, load and save
data, obtain information about the software, and so on. The
status window indicates the setup of the evaluation board/device,
number of samples taken, channel selected, and any information/
error messages that are generated.
The middle section of the AD7912/AD7922 main dialog box is
a digital storage oscilloscope (DSO). When samples are uploaded
from the EVAL-CONTROL-BRD2, they are displayed here. The
samples can be displayed either as integer values or as voltages.
Once the samples are displayed, clicking any point on the graph
will display the sample number and the value of the point directly
beneath the cursor. Along the axis of the graph are the “zoom
handles.” These allow the user to zoom in and out to get a closer
look at a particular sample if required. When another set of samples
are taken, the graph will attempt to display all values collected
unless Hold Zoom is selected. If the Hold Zoom box is selected,
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