DEM-DAI1604 Datasheet, PDF (8/11 Pages) Burr-Brown (TI) – EVALUATION FIXTURE

DEMONSTRATION SOFTWARE
Software is provided with the DEM-DAI1604 to allow
programming of the PCM1600’s internal registers. The soft-
ware will operate on computers running Microsoft Windows
3.1, 95 or 98. The demo software requires that the PC printer
port be connected to CN3 of the DEM-DAI1604 using a
standard printer cable.
Installation
The demo software is distributed on a 3.5 inch floppy disk.
On the disk, there is a single folder named “Dem1604.”
This folder contains the application and all support files.
To install the software on your computer, first create a new
folder on your hard drive with an appropriate name (e.g.,
DEM1604, PCM1604, etc.). Then open the “Dem1604”
folder on the installation floppy and copy all the files in it to
your new folder.
Open the configuration settings file named “Dem1604” with
a text editor, such as Notepad. When the file is opened, find
the following line:
PCMIFADR = &h378
The &h378 indicates the printer port address that the demo
software will use to communicate with the DEM-DAI1604.
This address must be set to &h378, &h278, or &h3BC. Most
PCs use &H378 as the default printer port address. If your
printer port is not located at &h378, edit the address to match
your computer’s port address.
Using the Demo Software
Double click on the application file named “Dem1604.”
A window will appear on your screen, as shown in Figure 5.
There are two menus near the top of the window, named
Execute and Window.
The Execute menu includes three selections: Initialize, Re-
set, and Exit. Selecting Initialize will instruct the program to
write all of the PCM1604’s internal registers with the default
values. Selecting Reset will instruct the program to rewrite
the PCM1604’s internal registers with the data currently
selected in the application windows. Selecting Exit will
close the application.
The Window menu includes four selections: Attenuation,
Operational Control, Function Control, and Register Read.
The following sections provide an explanation of each
window.
HOLD and PASS
Each window has a button near the top. It’s labeled either
HOLD or PASS. The current setting is toggled by clicking on
the button. When set to HOLD, the settings in a window can
be changed, but they will not be written to the register(s) until
the OK button (which appears at the bottom of the window)
is pressed. When set to PASS, setting changes made in a
window are immediately written to the corresponding
register(s).
Attenuation Window
The Attenuation window is used to set the digital attenuation
registers internal to the PCM1604 and is shown in Figure 6.
There is an attenuator for each of the six output channels,
and each attenuator has its own independent register to
control its attenuation level. In the Attenuation window,
there is a slider for each attenuator register. Use the slider
handle or the arrows at each end of the slider to adjust the
attenuation level. The left and right arrow keys on the
keyboard can also be used to adjust the level. To the right of
each slider is a status display showing the current register
setting (in decimal) and the corresponding attenuation level
in decibels (dB) relative to the input signal level.
FIGURE 5. Start Up Window.
®
DEM-DAI1604
FIGURE 6. Attenuation Window.
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