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ISL54207EVAL1Z Evaluation Board User’s
Manual
Description
The ISL54207EVAL1Z evaluation board is designed to
provide a quick and easy method for evaluating the
ISL54207 USB/CVBS/Audio IC.
The ISL54207 device is an unique IC. To use this evaluation
board properly, requires a thorough knowledge of the
operation of the IC. Refer to the ISL54207 datasheet for an
understanding of the functions and features of the device.
Studying the device’s truth table along with its “Pinout”
diagram on page 2 of the ISL54207 datasheet, is the best
way to get a quick understanding of how the part works.
A picture of the main evaluation board is shown in Figure 1.
The ISL54207 µTQFN IC is soldered onto the evaluation
board. It is located in the center of the board and is
designated as U1.
The ISL54207 IC is a dual SPDT analog switch that was
designed to multiplex between mono audio/video (A/V)
signals or USB differential signals of a portable media player
such as digital cameras, camcorders, MP3 players and
cellphones.
The part has two modes of operation: Audio/Video mode and
USB mode. The evaluation board contains standard RCA,
BNC, and USB connectors to allow the user to easily
interface with the IC to evaluate its functions, features, and
performance in these two modes of operation.
For example, when the board is properly powered, the
video/mono audio outputs of a video MP3 player can be
connected at RCA connectors J13 (VIDEO IN) and J15
(MONO AUDIO IN) and the USB output of the player can be
connected at the USB connector J12 (USB TO DEVICE) on
the board. See Figure 2 on page 4. A TV can be connected
at RCA jacks J5 (VIDEO OUT) and J7 (MONO AUDIO OUT)
to play the video on the TV. You can then turn-off the video,
disconnected the TV, and attach a USB cable from a
computer to USB connector J4 (USB TO HOST) to load
digital video tracks into the player.
This application note will guide the user through the process
of configuring and using the evaluation board to evaluate the
ISL54207 device in both the Audio/Video mode and the USB
mode.
Key Features
• Standard USB Connectors
• RCA Audio/Video Input Jacks and BNC Connectors
• Convenient Test Points and Connections for Test
Equipment
Picture of Evaluation Board (Top View)
Board Architecture/Layout
Basic Layout of Evaluation Board
The basic layout of the main board is as follows: Refer to
Figure 1.
Power (J2), GND (J1), logic VBUS (J3) and logic CTRL (J11)
banana jack connections are at the top of the board.
Audio/Video Source RCA inputs are at the lower right side of
the board (J13 and J15). Audio/Video RCA outputs are at
the lower left side of the board (J5 and J7).
A standard “B” type USB connection to an upstream host
controller (Computer) is made at connector J4, located on
left underside of the board. A standard “A” type USB
connection to a downstream USB device is made at
connector J12, located on right underside of the board.
Located in the center of the board is the ISL54207 IC (U1).
The evaluation board has a pin 1 dot, to show how the IC
should be oriented onto the evaluation board. The IC pin 1
indicator dot needs to be aligned with the evaluation board
pin 1 dot indicator.
Note: The connectors J5 (VIDEO OUT) and J7 (MONO
AUDIO OUT) are connected in parallel to J4 (USB TO
HOST). When driving the USB input, the A/V output should
be in a high impedance state (and vice versa).
FIGURE 1. ISL54207EVAL1Z EVALUATION BOARD
AN1358.0
Application Note
June 23, 2008
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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