• Click and Pop Elimination Circuitry (ISL54062, ISL54063,
and ISL54064)
• Manual or External Logic Input Control
AN1369 Rev 0.00
February 3, 2009
Page 1 of 5
ISL54059EVAL1Z Through ISL54064EVAL1Z
the BNC connectors J13-J14 located on the bottom right side
of the board.
Note: There are 500k
logic pull-down resistors on the INx
control pins. In external control mode when the digital logic
input lines are left in a floating state, these pull-down resistors
bias the logic inputs to ground.
Note: All switch terminals on the evaluation board have
place holders that can have surface mounted components
placed either in series with the switch path or shunted to
ground. Jumpers on these components allow flexible
configurations. Refer to the Evaluation Board Schematics
located on page 4 for clarification.
Switch Terminals
The evaluation board contains components to interface with
all six terminals of the Dual SPDT switch (four terminals for
the SPST switches). The common (COM) terminals of the
switch are located on the right side of the evaluation board.
The Normally Open (NO) and Normally Closed (NC) terminals
of the switch are located on the left side of the evaluation
board. All switch terminals include both RCA jacks and BNC
connectors. The COM terminals also include a headphone
jack (HJ1) for connecting a stereo headphone or line level
plug.
Note: There are 10k pull-down resistors on the NCx and
NOx pins of the evaluation board (R21, R22, R23, and R26).
They will need to be depopulated if the user does not desire to
have them.
Refer to Table 1 for a list of the connections on the
ISL540XXEVAL1Z and the associated pin of the IC. The
evaluation board also includes Test Points for convenient
locations to probe specific pins on the IC.
TABLE 1. BOARD COMPONENT TABLE
DEVICE
PIN
V
CC
GND
IN1
IN2
NO1
EVALUATION BOARD
CONNECTION
J1
J2
S2, J13
S1, J14
J11, J12
TEST
POINT
TP1
TP2
TP8
TP9
TP7
APPLICABLE
IC
All
All
All
All
ISL54059,
ISL54060,
ISL54062,
ISL54063
ISL54059,
ISL54061,
ISL54062,
ISL54064
All
ISL54059,
ISL54060,
ISL54062,
ISL54063
ISL54059,
ISL54061,
ISL54062,
ISL54064
All
Power Supply
The DC power supply connected at banana jacks J1 (V
CC
)
and J2 (GND) provides power to the evaluation board. The
evaluation board requires a +1.8V to +6.5V DC power
supply for proper operation. The power supply should be
capable of delivering 100µ
A
of current.
Logic Control
The state of the ISL540XX IC is determined by the Truth
Table as defined in their respective datasheet. When in
manual operation mode, the logic being toggled by the
SPST switches (S1-S2) will always drive the voltage of the
logic pin to V
CC
for a HIGH and GND for a LOW. In external
control mode, the voltages being driven by an external
source must meet appropriate V
IH
and V
IL
levels as defined
in the datasheet.
The control pins are 1.8V logic compatible up to a +3.3V
supply, which allows for control via a standard µcontroller.
Logic “0” (LOW) when
0.5V (or floating)
Logic “1” (HIGH) when
1.4V
When operating above +3.3V supply, refer to the datasheet
for appropriate logic levels to drive the logic pins. It is always
recommended to drive the logic pins to the positive supply
rail (V
CC
) and GND to minimize power consumption.
Logic States
INPUT SELECT (INX) PINS
If the INx Pins are logic “HIGH”, then the NOx switches are
turned ON and the NCx switches are turned OFF. If the INx
Pins are logic “LOW”, then the NCx switches are turned ON
and the NCx switches are turned OFF.
CLICK AND POP OPERATION (ISL54062, ISL54063,
ISL54064 ONLY)
Single supply audio sources are biased at a DC offset that
generates transients during power ON/OFF of the audio
source. This DC offset is coupled through a blocking
capacitor that is need to remove the DC bias to the speaker,
causing a transient voltage at the load. For example, when
the source is OFF and suddenly turned ON with a DC offset,
the capacitor will develop a voltage equal to the DC offset.
This voltage gets discharged by the speaker causing a click
and pop noise. The ISL54062, ISL54063, and ISL54064 ICs
integrate circuitry to eliminate click and pop noises to the
speaker.
For proper operation of Click and Pop elimination, the switch
terminal that is being connected to the speaker should be
connected through the integrated shunt resistor before
NC1
J5, J6
TP4
COM1
NO2
J3, J4, HJ1
J15, J16
TP3
TP10
NC2
J7, J8
TP5
COM2
J9, J10, HJ1
TP6
AN1369 Rev 0.00
February 3, 2009
Page 2 of 5
ISL54059EVAL1Z Through ISL54064EVAL1Z
DC POWER
SUPPLY
+1.8V TO +6.5V
-
+
AUDIO SOURCE
SIGNAL
RIGHT
LEFT
AUDIO SIGNAL
OSCILLOSCOPE
CHA
CHB
LOGIC CONTROL
FIGURE 2. BASIC EVALUATION TEST SETUP BLOCK DIAGRAM
connecting to the load. This allows any transients generated by
the source to be discharged through the shunt resistor first,
eliminating any audible click and pop noises. With a typical DC
blocking capacitor of 200µF and the shunt resistance having a
typical value of 140allowing a 250ms dead time in for
discharging a transient will eliminate the click and pop noise.
2. Connect the Audio Source Signal to the NOx or NCx BNC
inputs . The analog input voltage range can be from V
CC
-
6.5V up to V
CC
.
3. Connect the Audio Signal Oscilloscope to the COMx BNC
outputs .
4. Connect the Logic Control generator to the INx logic inputs.
Applications
The ISL540XX ICs are designed to be a Dual SPDT or SPST
switch for multiplexing or switching of signals that require low
insertion loss, low power consumption, and negative voltage
swing capability. Such applications include Audio/Video
equipment, battery or portable devices and medical equipment.
In addition, the Click and Pop Elimination Circuitry makes it
ideal for portable audio such as MP3 players and cell phones.
NCx Switches Active
1. Drive the INx pins to logic “LOW”.
2. The NCx switches are now connected to the COMx
terminals (ISL54059, ISL54061, ISL54062, and ISL54064
only).
3. The NOx switches have shunt resistors on the terminals to
ground (ISL54062 and ISL54063 only).
NOx Switches Active
1. Drive the INx pins to logic “HIGH”.
2. The NOx switches are now connected to the COMx
terminals (ISL54059, ISL54060, ISL54062 and ISL54063
only).
3. The NCx switches have shunt resistors on the terminals to
ground (ISL54062 and ISL54064 only).
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. +1.8V to +6.5V DC Power Supply
2. Audio Signal Generator
3. Audio Signal Oscilloscope
4. Logic Control Generator and/or Pulse Generator
Initial Board Setup Procedure
1. Attach the evaluation board to the DC power supply at J1
(V
CC
) and J2 (GND). Positive terminal at J1 and negative
terminal at J2. The supply should be capable of delivering
+1.8V to +6.5V and 100µ
A
of current.
AN1369 Rev 0.00
February 3, 2009
Page 3 of 5
TP7
1
3
1
1
R2 2 1 JP1
DNP
R1 2
DNP
JP9
1
2
J5 5
4
3
NC1
J6
1
2
R4 2
DNP
1
2
2
1
OPEN
R27
C4
2
2
1 1
DNP
OPEN
3
C3
COM1
1 R23 2
10k
NO1
TP8
2
3
NC1
10
9
8
1
43
R15
2
DNP
1 R16 2
DNP
1
0.1µF
1
TP4
1
V+
2
S2 3
1
IN1
R5 12 JP2
DNP
1
1 R21 2
10k
1
IN1
1 R24 2
499k
1
3
JP6
2
U1
U1
U1
TP9
V+
2
1
1
1
2
IN1
J13
5
2
S1 3
IN2
1
U1
U1
7
6
1
HJ1
1 R25 2
499k
JACK
2
5
3
4
1
1
2
U1
U1
JP7
HEADPHONE
IN2
1
3
TP10
JP12
1
2
2
1
1
2
DNP
1 R20 2
DNP
R18
1
OPEN
C10
2
1
OPEN
C9
3
4
3
4
1
2
IN2
J14
5
TP5
1
2
3
4
3
3
4
1
JP10
1
2
J7
5
1
2
1
OPEN
C6
R8
1 1
2
2
DNP
OPEN
3
2
C5
1
NC2
1 R26 2
10k
1 R22 2
10k
4
3
J9
J8
43
1
2
4
3
5
2
1 R10 2 1 JP3
DNP
R9 2
DNP
J10
1 R12 2 1 JP4
DNP
1
43 2
1 R11 2
DNP
3
COM2
1
2
COM2
1
3
1
2
TP6
NC2
1
2
DNP
R19
3
2
1
J4
5 43 2
TP2
1
2
1
10µF
C2
1
C1
2
1
TP1
1
2
DNP
R14
1
1
OPEN
2
1
OPEN
C8
1
2
3
4
2
AN1369 Rev 0.00
February 3, 2009
Page 4 of 5
ISL54059EVAL1Z Through ISL54064EVAL1Z Evaluation Board Schematic
ISL54059EVAL1Z Through ISL54064EVAL1Z
J3
COM1
5
1
2
4 3
TP3
GND
J2
2
U1
U1
5
U1
V+
J1
V+
JP11
1
2
C7
1
2
5 J11
NO1
4 J12
JP5
5J15
NO2
NO2
1
2
4 J16
JP8 2
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