ISL54206AEVAL1Z Intersil, ISL54206AEVAL1Z Datasheet - Page 2

• Manufacturer Part Number: ISL54206AEVAL1Z
• Description: EVALUATION BOARD FOR ISL54206A
• Manufacturer: Intersil

Specifications of ISL54206AEVAL1Z

• Main Purpose: Interface, Analog & Digital Switch
• Embedded: No
• Utilized Ic / Part: ISL54206A
• Primary Attributes: 2 x SPDT Audio & USB Switch
• Secondary Attributes: 2.7 V ~ 5.5 V Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power Supply
The DC power supply connected at banana jacks J10 (VDD)
and J11 (GND) provides power to the part. The IC requires a
2.7V to 5.5V DC power supply for proper operation. The
power supply should be capable of delivering 100µA of
current.
Logic Control
The state of the ISL54206A device is determined by the
voltage at the IN pin and the CTRL pin.
Access to the CTRL pin is through the banana jack J12
(CTRL).
Access to the IN pin is through banana jack J13 (IN) when
jumper JP3 is in position 2 to 3 and through the USB J1
(USB TO HOST) connector V
is in position 2 to 1.
These control pins are 1.8V logic compatible, which allows
for control via a standard microcontroller.
Logic “0” (LOW) when ≤ 0.5V
Logic “1” (HIGH) when ≥ 1.4V
Note: The evaluation board has the option of putting a 4MΩ
pull-down resistor from the IN pin to ground by putting a
jumper at JP4. The CTRL pin has an internal 4MΩ pull-down
resistor. These resistors pull the logic pins to ground when
J13, J1, or J12 are floated.
If IN is driven LOW and CTRL is HIGH, the part will be in the
Audio mode. The audio switches will be ON and the USB
switches will be OFF.
If IN is driven HIGH and CTRL = X (don’t care), the part will
be in the USB mode. The USB switches will be ON and the
audio switches will be OFF.
If IN is LOW and CTRL = LOW, the part will be in the Low
Power mode. In Low Power mode all switches are OPEN
and the part will draw around 1nA of current.
SETTING UP THE EVALUATION BOARD TO USE THE
COMPUTER V
Rather than using a logic controller to control the IN logic pin
through the J13 (IN) banana jack, you can directly drive the
IN pin using the V
USB J1 (USB TO HOST) connector.
To control the part through the J1 connector make the
following connections:
When the computer is not connected at J1, the external
pull-down will pull the IN pin low, putting the ISL54206A in
1. Install jumper at JP4. This connects an external 4MΩ
2. Install jumper at location 2 to 1 of jumper JP3. This
resistor from the IN pin of the part to ground.
connects the V
pin of the part. Note: With the jumper in this position, the
J13 banana jack is no longer connected to the IN pin of
the part.
BUS
BUS
BUS
VOLTAGE TO DRIVE THE “IN’ PIN
voltage from the computer through the
line of the J1 USB connector to the IN
BUS
2
line when the jumper JP3
Application Note 1337
the Audio mode or Low Power mode depending on the
condition of the CTRL pin.
When a USB cable from the computer is connected at J1,
the voltage at the IN pin will be driven to 5V and the part will
automatically go into the USB mode.
When the USB cable is disconnected from the J1 connector,
the voltage at the IN pin will be pulled low by the pull-down
resistor and return to the Audio Mode or Low Power Mode,
depending on the condition of the CTRL pin.
Note: The voltage at the IN pin can exceed the VDD voltage
by as much as 2.55V. This allows the V
computer or USB hub (4.4V to 5.25V) to drive the IN pin
while the V
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, respectively.
Over a signal range of ±1V (0.707V
have an extremely low r
pass ground referenced audio signals with very low
distortion (<0.05% THD+N) when delivering 15.6mW into a
32Ω headphone speaker load. A 3V
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.
source being connected to the evaluation board already has
internal AC coupling capacitors at the output of its drivers
then the capacitors on the evaluation board should be
shorted out (replaced with 0Ω resistors). This will prevent
further attenuation of the low frequency content of the audio
signal due to the increase of the high-pass corner frequency
resulting from the evaluation board capacitor in series with
the audio source capacitor.
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
evaluation 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 32Ω stereo headphone
should be plugged into this jack.
The BNC connector J8 (COM-) is in parallel with the audio
left line of the headphone jack and the D- line of the J1 (USB
DD
voltage is in the range of 2.7V to 5.5V.
ON
resistance variation. They can
RMS
P-P
BUS
signal is acceptable
) these switches
voltage from a
If the audio
July 31, 2007
AN1337.0