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®
AN1255.0
ISL5440XEVAL1Z Evaluation Board
User’s Manual
Description
The ISL5440XEVAL1Z evaluation board is designed to
provide a quick and easy method for evaluating the
ISL54400, ISL54401 and ISL54402 USB/Audio Switch ICs.
An evaluation kit consists of the following items: One Main
Evaluation Board; Three
µTQFN to Dip Daughter Boards
with mounted IC; ISL5440XEVAL1Z Evaluation Board User’s
Manual; ISL54400, ISL54401, ISL54402 Data Sheet; Main
Evaluation Board Schematic.
The ISL54400EVAL1Z kit contains three daughter boards
with the ISL54400 part.
The ISL54401EVAL1Z kit contains three daughter boards
with the ISL54401 part.
The ISL54402EVAL1Z kit contains three daughter boards
with the ISL54402 part.
The ISL5440x devices are unique ICs. To use this evaluation
platform properly requires thorough knowledge of the operation
of the ICs. Refer to the data sheet for an understanding of the
functions and features of this family of devices. Studying a
device’s truth-table along with its pinout diagram on pages 2
and 3 of the data sheet is the best way to get a quick
understanding of how a particular part in this family works.
A picture of the main evaluation board with IC to dip daughter
board installed is shown in Figure 1. The main board has a 10
pin dip socket (U1) located in the center of the board. An IC is
soldered onto a 10 pin dip daughter board that is plugged into
the dip socket on the main board. Using daughter boards
allow for the easy installation and removal of ICs.
The USB/Audio Switch ICs have two modes of operation
called Audio mode and USB mode. The main evaluation
board contains standard Audio and USB connectors to allow
the user to easily interface with the IC to evaluate its
functions, features, and performance in the two modes of
operation. For example, when the board is properly
powered, a headphone can be plugged into the headphone
jack (J7) and a stereo source, such as a MP3 player, can be
connected at the RCA connectors J3 (AUDIO LEFT) and J4
(AUDIO RIGHT) to play music through the audio switches of
the IC. See Figure 2. You can then turn-off the audio source,
remove the headphones, and attach a USB cable from a
computer to USB connector J1. This will establish a
connection from the computer through the USB switches of
the IC to the USB device, that is connected at the USB
connector J2, to send and receive data.
This application note will guide the user through the process
of configuring and using the evaluation board to evaluate the
ISL5440x family of devices in both the Audio mode and the
USB mode.
Features
• Dip Socket For Quick Removal and Installation of DUTs
• Standard USB Connectors
• RCA Audio Input Jacks and Headphone Speaker Jack
• Convenient Test Points and Connections for Test
Equipment
Picture of Evaluation Board (Top View)
Board Architecture/Layout
Basic Layout of Main Board
The basic layout of the main board is as follows: Refer to
Figure 1.
Power and Ground connections are at the top of the board
(J10 and J11).
Audio Source Inputs are at the lower right side of the board
(J3 - J6). Audio outputs are at the lower left side of the board
(J7, J8, J9). Connector J7 is a standard headphone jack for
connecting a 32
Ω headphone.
USB connection to an upstream host controller (Computer)
is made at connector J1, located on left under-side of the
main board. USB connection to a downstream USB device is
made at connector J2, located on right under-side of the
main board.
FIGURE 1. ISL5440XEVAL1 BOARD WITH IC DIP BOARD
INSTALLED
Application Note July 19, 2006
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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