ISL54209EVAL1Z Intersil, ISL54209EVAL1Z Datasheet - Page 2

• Manufacturer Part Number: ISL54209EVAL1Z
• Description: EVALUATION BOARD FOR ISL54209
• Manufacturer: Intersil

Specifications of ISL54209EVAL1Z

• Main Purpose: Interface, Analog & Digital Switch
• Embedded: No
• Utilized Ic / Part: ISL54209
• Primary Attributes: 2 x SPDT Audio & USB Switch
• Secondary Attributes: 2.5 V ~ 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 ISL54209 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.
The following control pins are 1.8V logic compatible which
allows for control via a standard µcontroller.
Logic “0” (LOW) when ≤ 0.5V or floating
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. However it is not required for the ISL54209
part because the IN and CTRL pins have 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:
1. Install jumper JP3 at location 2 to 1. This connects the
2. A 500kΩ resistor should be put in series with the IN pin if
Vbus line of the J1 USB connector to the IN 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.
the V
resistor is not on the evaluation board. There is an
BUS
voltage is greater than the VDD voltage. This
BUS
BUS
VOLTAGE TO DRIVE THE “IN’ PIN
voltage from the computer through the
BUS
2
line when the jumper JP3
Application Note 1406
When the computer is not connected at J1, the internal
pull-down will pull the IN pin low putting the ISL54209 in 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 high and the part will
automatically go into the USB mode.
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 connected to the
RCA jacks J3 and J4, respectfully.
Over a signal range of ±1V (0.707V
an extremely low r
ground referenced audio signals with very low distortion
(<0.05% THD+N) when delivering 15.6mW into a 32Ω
headphone speaker load. A 3V
performance will degrade.
The audio input channels are AC coupled with 100µF
capacitors. These capacitors remove any DC voltage from
the audio signals and reference them to ground of the
device. If the audio 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.
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
To HOST) connector. The BNC connector J9 (COM+) is in
parallel with the audio right line of the headphone jack and
the D+ line of the J1 (USB To DEVICE) connector. These
BNC connectors can be used to connect resistive loads
and/or test equipment to evaluate the performance of the IC.
internal diode in the IC from the IN pin to VDD that will get
forward biased and draw current as the voltage at the IN
pin exceeds the VDD voltage. With V
VDD = 3.3V, this resistor will limit the current to around
2.76µA and the voltage at the IN pin will be around 3.6V
which is well above the V
required for proper operation.
ON
resistance variation. They can pass
in
H minimum level of 1.4V
p-p
signal is acceptable but
rms
) these switches have
BUS
= 5.25V and
July 14, 2008