4
AN1408.0
February 13, 2009
Using The Board (
Refer to Figure 2
)
Lab Equipment
The equipment, external supplies and signal sources
needed to operate the board are listed below:
1. +3V to 5V DC Power Supply
2. Stereo Audio Source (MP3/Radio/CD Player) or Audio
Generator
3. Headphone Set or Audio Analyzer/Oscilloscope
4. Two standard High-speed USB cables
5. Computer with USB port
6. USB device (i.e. USB memory stick, MP3 Player with
USB port, etc.)
Initial Board Setup Procedure
1. Attach the main evaluation board to a DC power supply
at J10 (VDD) and J11 (GND). Positive terminal at J10 and
negative terminal at J11. The supply should be capable of
delivering 3V to 5V and 100
µA
of current. Set the supply
voltage to 3.3V.
2. Connect the stereo audio source left channel to J3 RCA
connector or J5 BNC connector and right channel to J4
RCA connector or J6 BNC connector.
3. Connect the USB device to the USB “B” type receptacle,
J2 (USB TO DEVICE).
Audio Mode Operation
1. Install headphone in the headphone jack, J7. No USB
cable should be connected at the J1 (USB TO HOST)
connector.
2. Logic Control: Put CTRL = Logic “1” and IN = Logic “0”.
You will now be in Audio mode (2.4
Ω
audio switches are
ON).
3. Turn the audio source ON. You should hear the music in
the headphones.
4. You can observe the audio signals at the output of the IC
on an oscilloscope or audio analyzer by using the J8 and
J9 BNC connectors. Connect to J8 for Left audio and J9
for right audio.
USB Mode Operation
1. Turn OFF audio stereo source.
2. Remove headphone from J7 Headphone Jack.
3. Logic Control: Put CTRL = Logic “X” and IN = Logic “1”.
You will now be in USB mode (5.4
Ω
USB switches are
ON).
4. Connect USB cable from computer USB port to the USB
“A” type receptacle, J1 (USB TO HOST) on the evaluation
board. The computer should indicate that it is connected
to the USB device connected at the J2 connector.
5. You will now be able to send and receive data between
the computer and USB device.
+3.3V
DC POWER
SUPPLY
ISL54211EVAL1Z EVALUATION BOARD
VDD
GND
FIGURE 2. BASIC EVALUATION TEST SETUP BLOCK DIAGRAM
J1
HEADPHONE
U1
+
-
JACK
J7
USB TO HOST
J3
J4
COMPUTER
USB PORT
AUDIO LEFT
AUDIO RIGHT
J12
J9
J8
R
L
USB DEVICE
USB PORT
AUDIO
SOURCE
J2
J5
J6
USB
TO
DEVICE
JP1
JP2
J14
J15
CTRL
J13
IN
J10
J11
COM - COM +
LOGIC
CONTROL
JP4
JP3
1
2
3
Application Note 1408
