ISL54211EVAL1Z Intersil, ISL54211EVAL1Z Datasheet - Page 2

• Manufacturer Part Number: ISL54211EVAL1Z
• Description: EVAL BOARD 1 FOR ISL54211
• Manufacturer: Intersil

Specifications of ISL54211EVAL1Z

• 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 5.0V DC power supply for proper operation. The
power supply should be capable of delivering 100
current.
Logic Control
The state of the ISL54211 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
Logic “0” (LOW) when <= 0.5V or floating
Logic “1” (HIGH) when >= 1.4V
Note: The evaluation board has the option of putting a 4M
pull-down resistor from the IN pin to ground by putting a
jumper at JP4. However it is not required for the ISL54211
part because the IN and CTRL pins have internal 4MΩ
pull-down resistors. 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 is LOW, the part will be in the MUTE
mode. In MUTE mode all switches are OPEN.
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
V
Note: With the jumper in this position the J13 banana jack is
no longer connected to the IN pin of the part.
2. A 500k
the V
series resistor is not on the evaluation board. There is an
internal diode in the IC from the IN pin to VDD that will get
BUS
BUS
line of the J1 USB connector to the IN pin of the part.
Ω
voltage is greater than the VDD voltage. This
resistor should be put in series with the IN pin if
BUS
BUS
VOLTAGE TO DRIVE THE “IN’ PIN
voltage from the computer through the
µ
controller.
BUS
2
line when the jumper JP3
Application Note 1408
µ
A of
Ω
forward biased and draw current as the voltage at the IN pin
exceeds the VDD voltage. With V
3.3V, this resistor will limit the current to around 2.76
the voltage at the IN pin will be around 3.6V which is well
above the VinH min level of 1.4V required for proper
operation.
When the computer is not connected at J1, the internal pull-
down will pull the IN pin low putting the ISL54211 in the
Audio mode or Mute 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.
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 Mute mode
depending on the condition of the CTRL pin.
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.
Over a signal range of
have an extremely low r
pass ground referenced audio signals with very low
distortion (<0.05% THD+N) when delivering 15.6mW into a
32W 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. If the audio
source being connected to the evaluation board already has
AC coupling capacitors at the output of its drivers then the
capacitors on the evaluation board should be shorted out
(replaced with 0 Ω 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 32
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
±
ON
1V (0.707V
resistance variation. They can
BUS
RMS
P-P
= 5.25V and VDD =
W
) these switches
signal is acceptable
stereo headphone
February 13, 2009
μ
AN1408.0
A and