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MAX98303 Evaluation Kit
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
TOKO America, Inc.
PHONE_
770-436-1300
847-803-6100
847-297-0070
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
www.tokoam.com
Note: Indicate that you are using the MAX98303EWE+when contacting these component suppliers.
Quick Start
Detailed Description of Hardware
? MAX98303 EV kit
Recommended Equipment
Filterless Output
The MAX98303 EV kit’s filterless outputs (OUTL+,
? 2.6V to 5.5V, 2A DC power supply
? Stereo audio input
? Two 4 I speakers
Procedures
The EV kit is fully assembled and tested. Follow the
steps below to verify board operation. Caution:_Do_not_
turn_ on_ the_ power_ supply_ until_ all_ connections_ are_
completed.
OUTL-, OUTR+, and OUTR-) can be connected directly
to a speaker load without any filtering. Use the OUTL+
and OUTL- test points or the OUTR+ and OUTR- test
points to connect the speaker directly to the device
output.
Filtered Output
Audio analyzers typically cannot accept the Class D
amplifier’s pulse-width modulated (PWM) signals at their
inputs. Therefore, the EV kit features optional lowpass
1)
2)
3)
4)
5)
6)
Verify that shunts are installed as follows:
JU1, JU4: Installed (single-ended input)
JU2: Pins 1-2 (device enabled)
JU3: Pins 1-3 (12dB gain)
Set the power-supply output to 5V. Disable the
power supply.
Connect the power-supply ground terminal to the
GND pad and the power-supply positive terminal to
the VDD pad of the EV kit.
With the audio source disabled, connect the left
channel of the audio source to the INL+ pad.
Connect the right channel of the audio source to the
INR+ pad.
Connect the audio source ground to the GND test
pad.
filters at the outputs to ease evaluation. As shipped, the
EV kit’s lowpass filter RC components are unpopulated
and inductors L1–L4 are shorted on the PCB.
To use the filtered output posts (FOUTL+, FOUTL-,
FOUTR+, and FOUTR-), remove the shorts on L1–L4
and install components L1–L4, C7–C16, and R3–R6
(provided separately with the EV kit). Use the output
posts to connect the filtered outputs to the audio
analyzer. The default lowpass filters at the EV kit output
are optimized for an 8 I speaker.
Jumper Selection
Single-Ended/Differential Audio Inputs
The EV kit features jumpers JU1 and JU4 to select
between a differential or single-ended input mode. See
Table 1 for JU1 and JU4 configuration.
Table_1._JU1_and_JU4_Jumper_Selection
7) Connect the first speaker across the OUTL+ and
OUTL- test points.
8) Connect the second speaker across the OUTR+
and OUTR- test points.
9) Enable the power-supply output.
10) Enable the audio source.
11) Verify that the speakers are playing the audio
source signal.
SHUNT_
POSITION
Installed*
Not installed
* Default position.
IN_-_PIN
AC-grounded
AC-coupled to a
user-supplied
negative differential input
DEVICE_
OPERATION
Single-ended
input
Differential
input
2_ _ _______________________________________________________________________________________
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