Evaluate: MAX9768
MAX9768 Evaluation Kit/Evaluation System
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4) Plug the audio source to the RCA jack.
5) Turn on the audio source.
6) Turn on the 4.5V to 14V DC power supply.
7) Adjust the potentiometer R6 to change the speaker
volume.
Procedure for I
2
C Interface
Volume Control
The MAX9768 EV kit is fully assembled and tested.
Follow the steps below to verify board operation for I
2
C
volume control. Caution: Do not turn on the power
supply until all connections are completed.
1) Visit www.maxim-ic.com/evkitsoftware to download
the latest version of the EV kit software,
9768Rxx.ZIP.
2) Install the MAX9768 evaluation software on your
computer by running the INSTALL.EXE program.
The program files are copied and icons are created
in the Windows Start menu.
3) On the CMAXQUSB board, ensure that the shunt of
JU1 is in the 3.3V position.
4) Carefully connect the boards by aligning the
MAX9768 EV kit’s 20-pin connector with the 20-pin
connector of the CMAXQUSB board.
5) Ensure shunts on JU1, JU2, JU4, JU6, and JU7 are
in their default positions (see Table 1).
6) Place the shunt on JU3 across pins 1-2.
7) Place the shunt on JU5 across pins 1-2.
8) Remove the shunt on JU8.
9) Connect the positive terminal of the 4.5V to 14V DC
power supply to the PV
DD
binding post, and the
power-supply ground terminal to the PGND binding
post.
10) Connect the 8Ω speaker across the FOUT+ and
FOUT- binding posts.
11) Plug the audio source to the RCA jack.
12) Turn on the audio source.
13) Turn on the 4.5V to 14V DC power supply.
14) Connect the USB cable from the PC to the
CMAXQUSB board. A Building Driver Database
window pops up in addition to a New Hardware
Found message. If you do not see a window that is
similar to the one described above after 30s, remove
the USB cable from the CMAXQUSB and reconnect
it. Administrator privileges are required to install the
USB device driver on Windows 2000/XP. Refer to
the TROUBLESHOOTING_USB.PDF document
included with the software if you have any prob-
lems during this step.
15) Follow the directions of the Add New Hardware
Wizard to install the USB device driver. Choose the
Search for the Best Driver for your Device option.
Specify the location of the device driver to be
C:\Program Files\MAX9768 (or the directory cho-
sen during installation) using the Browse button.
16) Start the MAX9768 EV kit software by opening its
icon in the Start menu. The GUI main window
appears, as shown in Figure 1.
17) Move the volume-control slider on the software win-
dow and verify that the speaker volume changes.
