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ISL54406EVAL1Z Evaluation Board
User ’s Manual
Application Note
August 18, 2008
AN1368.0
Description
The ISL54406EVAL1Z evaluation board is designed to
provide a quick and easy method for evaluating the
ISL54406 Click and Pop Eliminator IC.
The ISL54406 device is a unique IC. To use this evaluation
board properly requires a thorough knowledge of the
operation of the IC. Refer to the data sheet (FN6578) 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 data sheet is the best way to get a
quick understanding of how the part works.
A picture of the evaluation board is shown in Figure 1. The
ISL54406 μTQFN IC is set in a socket on the evaluation
board. It is located in the center of the board and is
designated as U1.
The ISL54406 IC is a dual SPST analog switch that has four
modes of operation: Audio, Mute, Click and Pop, and
Shutdown (SHDN) mode. The evaluation board contains
standard RCA/BNC connectors and a single headphone jack
to allow the user to easily interface with the IC to evaluate its
functions, features, and performance in the four modes of
operation. The evaluation board has selectable output loads
of 20k Ω and 32 Ω resistors to simulate an audio amplifier
pre-amp or stereo headphones. The board also has DC
blocking capacitors at the switch input to remove the DC
bias of single supply amplifiers.
This application note will guide the user through the process
of configuring and using the evaluation board to evaluate the
ISL54406 device for Click and Pop elimination and Audio
Muting applications.
Features
? Selectable Output Resistive Loads and Input DC Blocking
Capacitors
? RCA Audio Input/Output Jacks, Stereo Headphone Output
Jack and BNC Connectors
? Convenient Test Points and Connections for Test
Equipment
? Click and Pop Elimination Circuitry
? High Off-Isolation Audio Muting
Picture of Evaluation Board (Top View)
FIGURE 1. ISL54406EVAL1Z EVALUATION BOARD
Board Architecture/Layout
Basic Layout of Evaluation Board
Refer to Figure 1 and the Board Schematic at the end of this
manual. The basic layout of the main board is as follows:
Power (J1), Ground (J2), logic SEL1(J9/J10) and logic SEL2
(J3/J4) connections are located at the top of the board.
Audio Input BNC/RCA connectors are at the right side of the
board for LIN input (J11/J12) and RIN input (J13/J14).
Note: The audio inputs have a 200μF series DC blocking
capacitance that can be used for AC-coupling audio signals
that are DC biased in single supply systems. If the audio
source is not DC biased, it is recommended to bypass the
capacitors (C3 to C6) by placing a jumper on JP6 for LIN and
JP7 for RIN. Note that if the audio source already has a DC
blocking capacitor, it is recommended to bypass the
capacitor on the evaluation board, otherwise this will
increase insertion loss. The capacitance can be reduced to
100μF by depopulating the 0 Ω resistor on R 6 and R 7 .
Audio output RCA/BNC connectors are on the left side of the
board labeled LOUT output (J5/J6) and ROUT output
(J7/J8). In addition, the left and right outputs are also
connected to the stereo headphone jack HJ1. Selectable
load resistances are available on the evaluation board.
When jumpers JP2 and JP3 are in the 1-2 pin position, the
load is 20k Ω and in the 2-3 position the load is 32 Ω . The load
can be bypassed by removing the jumpers altogether.
Located in the center of the board is the ISL54406 IC (U1).
The socket for the IC has a pin 1 dot to show how the IC
should be oriented on the socket. The IC pin 1 indicator dot
needs to be aligned with the socket pin 1 indicator dot that is
visible when the socket is unlatched.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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