4
AN1407.0
January 23, 2009
Using The Board (
Refer to Figure 2
)
Lab Equipment
The equipment, external supplies and signal sources
needed to operate the board are listed in the following:
1. +2.7V to 3.6V 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 2.7V to 3.6V and 100µ
A
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).
4. Install a jumper at position 2 to 1 of JP3. This allows the
V
BUS
voltage from the computer to drive the V
BUS
pin of
the IC. No jumper required at JP4.
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. Connect J12 (CTRL) to J10 (VDD). 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. Connect USB cable from host (PC computer) to the USB
“A” type receptacle, J1 (USB TO HOST). You will now be
in USB mode (5.4
Ω
USB switches are ON).
4. You should now be able to send and receive data
between the host and USB device.
5. You can observe the D- and D+ USB digital signals on an
oscilloscope or other test equipment by connecting to the
J8, J14, J9 and J15 BNC connectors. Connect to J8/J14
for D- signal and to J9/J15 for D+ signal.
6. Remove the 0
Ω
resistors R1, R2, R3, R4 when
evaluating the performance (i.e. eye diagram, etc.) of the
high speed USB signal. Removal of these resistors
disconnects the headphone jack (J7) and BNC
connectors (J8, J9, J14, J15) from the USB differential
lines. These components when connected will degrade
the USB signal. These components will not be there in an
actual application.
LOGIC
CONTROL
+3.3V
DC POWER
SUPPLY
ISL54210EVAL1Z 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 +
JP4
JP3
1
2
3
Application Note 1407
