ISL54402EVAL1Z Intersil, ISL54402EVAL1Z Datasheet - Page 2

• Manufacturer Part Number: ISL54402EVAL1Z
• Description: EVALUATION KIT FOR ISL54402
• Manufacturer: Intersil

Specifications of ISL54402EVAL1Z

• Main Purpose: Interface, Analog & Digital Switch
• Embedded: No
• Utilized Ic / Part: ISL54402
• Primary Attributes: 2 x SPDT Audio & USB Switch
• Secondary Attributes: 1.8 V ~ 5.5 V Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Located in the center of the board is the DIP socket (U1).
The IC to Dip Daughter Board plugs into this socket. The
main board has a pin 1 label, to show how the IC daughter
board should be oriented in the socket. The daughter board
pin 1 indicator dot needs to be aligned with the main
evaluation board dip socket labeled 1.
Power Supply
The ISL5440x devices require a DC power supply for proper
operation. The DC power supply + and - terminals are
connected at banana jacks J10 (VDD) and J11 (GND)
located at the top of the board.
ISL54400 AND ISL54401
In Audio mode the V
jacks J10 (VDD) and J11 (GND) provides power to the part.
A 2.7V to 3.6V DC power supply is needed for proper
operation. The power supply should be capable of delivering
100
In USB mode the V
controller (computer) connected at the USB connector J1
(USB to HOST) provides power to the part.
NOTE: For the ISL54400 and ISL54401 devices the V
voltage needs to be at least 0.8V higher than the voltage at
V
switches ON. In a typical application, the V
host controller will be in the range of 4.4V to 5.25V and the
V
The ISL54400 VTERM does not output a voltage unless
V
ISL54402
Power for the ISL54402 device is always provided by the DC
voltage source connected at the J10 (VDD) and J11 (GND)
Led jacks. The VDD voltage can be in the range of 1.8V to
5.5V. In a USB application, it should be set in the range of
2.7V to 5.5V and should be capable of delivering 100
current.
Logic Control
ISL54400 AND ISL54401
The state of the ISL54400 and ISL54401 devices is
determined by the voltage at the V
floating (no USB host controller connected at the J1
connector) the part will be in the Audio mode.
If V
connected at the J1 USB connector) the part will be in the
USB mode. In a typical application the V
host controller will be in the range of 4.4V to 5.25V and the
V
ISL54402
Logic control for the ISL54002 device is the same as a
standard dual SPDT switch. The voltage applied at J13 (IN2)
and J12 (IN1) determines whether the NOx (Digital) or NCx
DD
DD
BUS
DD
BUS
µA
to turn the audio switches OFF and turn the USB
voltage will be in the range of 2.7V to 3.6V.
voltage will be in the range of 2.7V to 3.6V.
> V
of current.
is greater than V
DD
+ 0.8V and V
BUS
DD
power supply connected at banana
5VDC voltage from the host USB
DD
DD
by 0.8V (USB host controller
2
> 2.5V.
BUS
pin. If V
BUS
BUS
voltage from
BUS
voltage from
Application Note 1255
is
µA
BUS
of
(Audio) switches are ON or OFF. The ISL54002 logic levels
are TTL compatible. See truth-table on page 3 of data sheet.
In a typical application, connector J12 and J13 should be
connected together, allowing the logic control inputs to the IC
to work in tandem. If you pull them LOW by connecting them
to ground the NCx switches will be ON. If you pull them
HIGH by connecting them to VDD or VBUS of the computer
(In USB application) the NOx switches will be ON.
NOTE: The BNC connector J13 is wired in parallel with the
VBUS line of the USB J1 connector. When you connect a
USB cable from a computer to the J1 USB connector this will
put the logic of pin 2 (IN2) of the IC at 5V. If connector J12 is
connected to connector J13 then the logic of pin 10 (IN1) of
the IC will also be at 5V and both USB switches will be ON.
This is required for proper USB operation.
Audio Inputs
The evaluation board has two audio inputs labeled AUDIO
LEFT (J3 or J5) and AUDIO RIGHT (J4 or J6). Each of these
inputs have a BNC connector wired in parallel with a RCA
jack connector. You can connect an audio source/generator
at either the BNC connector or the RCA connector.
In a typical application, the left and right outputs of a stereo
source, such as an MP3 player, would be connect to the
RCA jacks J3 and J4, respectfully.
The internal audio switches of the ISL5440x family of
devices were designed to pass a 0.6V
32
audio source amplitude should be less than 1.75V
(0.62V
acceptable but performance will degrade.
The audio channels are AC coupled with 100µF capacitors.
These caps remove any DC voltage from the audio signals
and reference them to ground of the device.
NOTE: The audio switches are not bi-directional. The audio
source needs to be connected at J3 or J5 and J4 or J6. Do
not try to apply an audio source at the J8 and J9 BNC
connectors on left side of the board and loads at J3 - J6 on
right side of the board.
NOTE: When in USB mode the audio source needs to be in
a high impedance state so it will not interfere with the USB
signal. Since the audio source inputs are AC coupled on the
eval board, simply turning the audio source OFF will isolate it
from interfering with the USB signal.
Audio Outputs
The evaluation board has a standard headphone jack
labeled HEADPHONE JACK (J7). A 32
should be plugged into this jack. The BNC connector J8
(D-/L/COM1) is in parallel with the audio left signal of the
headphone jack. The BNC connector J9 (D+/R/COM2) is in
parallel with the audio right signal of the headphone jack.
These BNC connectors can be used to connect resistive
Ω
headphone load with very low signal distortion. The
rms
) for best performance. A 3V
RMS
pp
Ω
signal is
stereo headphone
signal across a
pp
July 19, 2006
AN1255.0