Datasheet

EVAL-AD7327CB
Rev. 0 | Page 7 of 16
EVALUATION BOARD SOFTWARE
AD7327 SOFTWARE
Included in the EVAL-AD7327CB evaluation kit is a CD that
contains software for controlling and evaluating the performance
of the AD7327 when it is operated with the EVAL-CONTROL-
BRD2. Insert the CD to automatically begin the installation
program. This program installs the evaluation software onto
the user’s machine, and it also installs the data sheets for this
evaluation board, the
AD7327, and the EVAL-CONTROL-
BRD2. All literature on the CD is in PDF and requires Adobe
Acrobat Reader® to be viewed or printed. The user interface
on the PC is a dedicated program written especially for the
AD7327 when operated with the EVAL-CONTROL-BRD2.
SOFTWARE DESCRIPTION
The software that controls the EVAL-CONTROL-BRD2, and
therefore the AD7327, has two main dialog boxes. The dialog
box shown in
Figure 3 appears when the software is run. The
main function of this dialog 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
dialog box can be divided into three sections.
The upper third of the dialog box contains the control buttons,
the menu bar, the busy status, and the selection windows. The
control buttons allow users to:
• Take samples (Sample)
• Reset the board
• EXIT the program
• Click Device Select to open the Load Configuration
dialog box (see
Figure 4) and to load a configuration file.
The menu bar consists of File and About. The File menu allows
the following:
• Load Raw Data: Selecting this option allows the user to
load data that has been saved by the software during a
previous session.
• Save Raw Data: Selecting this option allows the user to
save the current set of sample data points. The data can be
reloaded to the EVAL-CONTROL-BRD2 at a later date or
can be used by other programs for further analysis.
• Save Binary Data: Selecting this option allows the user to
save the current set of sample data points. The data is saved
in binary format as a text file. This method can be useful for
examining code flicker and looking for stuck bits.
• EXIT: Quits the program.
The About drop-down menu gives the user information about
the version of the software.
The Busy Status indicates to the user when the evaluation
board is busy.
The selection’s window allows the user to change the sampling
Frequency and the number of samples (Num Samples) to upload
(see
Figure 3).
The middle third of the dialog box is a digital storage
oscilloscope (DSO) that allows the user to display either a
Wa vefo rm , a Histogram, or an FFT. When samples are uploaded
from the EVAL-CONTROL-BRD2, they are displayed here
(see
Figure 3). At the bottom left of the graph are the zoom
options. These allow the user to zoom in and out to get a closer
look at a sample, if required. The right-hand side of the middle
section contains information about the samples taken such as
minimum (Min)/maximum (Max) position or velocity, the
Spread, the Mean, and the standard deviation (Std. Dev).
The lower third of the dialog box is also a DSO that allows the
user to display either a Wave for m, a Histogram, or an FFT.
The FFT (the default option) is typically used when the user is
concerned with examining the performance in the frequency
domain, and the Histogram gives an indication of the performance
in response to dc inputs. The option displayed can be changed
by clicking the Wav efor m, Histogram, and FFT buttons. The
right-hand side of the lower section contains information about
the samples taken, for example, ac specifications (see
Figure 3).
Load Configuration Dialog Box
The Load Configuration dialog box allows users to load the
required configuration file for the evaluation board (see
Figure 4).
The configuration file gives the software detailed information
about the AD7327 evaluation board, and the part connected to
the EVAL-CONTROL-BRD2, such as the number of bits (Num
Bits), the maximum sampling rate (Max Sample Frequency),
the output coding, and the power supply requirements. The
configuration file also tells the software the names of the DSP
program file that it should download to the EVAL-CONTROL-
BRD2. The Load Configuration dialog box also allows the user
to choose the sampling frequency (Sample Frequency) and the
number of samples (Num Samples) to take.