19-5599; Rev 0; 10/10
MAX98303 Evaluation Kit
General Description
The MAX98303 evaluation kit (EV kit) is a fully assembled
and tested PCB that evaluates the MAX98303 stereo
3.1W Class D amplifier in a 16-bump, 0.4mm pitch
wafer-level package (WLP). The EV kit operates from
a single 2.6V to 5.5V DC power supply and is capable
of delivering 3.1W into a 4I load. The EV kit accepts
a differential or single-ended audio input and provides
differential outputs for the speaker. The device outputs
can be connected directly to a speaker load for filterless
applications; however, a filter can be added to ease
evaluation.
S
Delivers_3.1W_Into_a_4I_Load
S
Single-Ended_or_Differential_Audio_Input
S
Five_Selectable_Gains
S
Filterless_Operation
S
Optional_Class_D_Output_Filters_for_Ease_of_
Features
S
2.6V_to_5.5V_Single-Supply_Operation
Evaluates: MAX98303
Evaluation
S
Low-Power_Shutdown_Input
S
Fully_Assembled_and_Tested
Ordering Information
PART
MAX98303EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
0.1FF
Q10%,
16V X7R
ceramic capacitor (0402)
Murata GRM155R71C104K
TDK C1005X7R1C104K
10FF
Q10%,
6.3V X7R
ceramic capacitor (0805)
Murata GRM21BR70J106K
TDK C2012X7R0J106K
1FF
Q10%,
25V X7R ceramic
capacitors (0603)
Murata GRM188R71E105K
Murata GRM188R71E105M
Not installed, capacitors
(0603)
0I resistors (0603)
Binding posts
White phono jack
(side-entry PCB mount)
Red phono jack
(side-entry PCB mount)
2-pin headers
DESIGNATION
JU2
JU3
L1–L4
OUTL+, OUTL-,
OUTR+, OUTR-
R1, R2
R3–R6
U1
—
—
QTY
1
1
0
4
2
0
1
4
1
DESCRIPTION
3-pin header
5-pin header
Not installed, inductors—PCB
short
Test points
100kI
Q5%
resistors (0603)
Not installed, resistors (0603)
2.6W Class D amplifier
(16 WLP)
Maxim MAX98303EWE+
Shunts (JU1–JU4)
PCB: MAX98303
EVALUATION KIT+
0.22FF
Q10%,
25V X7R
ceramic capacitors (0603)
Murata GRM188R71E224K
TDK C1608X7R1E224K
22FH
Q20%,
1A inductors
TOKO A916CY-220M
22I
Q5%
resistors (0603)
C1
1
C2
1
C3, C4, C17, C18
4
C5–C16, C19, C20
FB1–FB4
FOUTL+, FOUTL-,
FOUTR+, FOUTR-,
GND, VDD
INL
INR
JU1, JU4
0
4
6
OPTIONAL_COMPONENTS
C7–C16
10
1
1
2
L1–L4
R3–R6
4
4
________________________________________________________________ _Maxim
Integrated Products_
_ 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX98303 Evaluation Kit
Evaluates: MAX98303
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
PHONE_
770-436-1300
847-803-6100
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
TOKO America, Inc.
847-297-0070
www.tokoam.com
Note:
Indicate that you are using the MAX98303EWE+when contacting these component suppliers.
Quick Start
• MAX98303 EV kit
• Stereo audio input
• Two 4I speakers
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.
1)
Verify that shunts are installed as follows:
JU1, JU4: Installed (single-ended input)
JU2:
JU3:
2)
3)
Pins 1-2 (device enabled)
Pins 1-3 (12dB gain)
Detailed Description of Hardware
The MAX98303 EV kit’s filterless outputs (OUTL+,
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.
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
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 8I speaker.
Recommended Equipment
Filterless Output
• 2.6V to 5.5V, 2A DC power supply
Procedures
Filtered Output
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.
Connect the first speaker across the OUTL+ and
OUTL- test points.
Connect the second speaker across the OUTR+
and OUTR- test points.
Enable the power-supply output.
4)
5)
6)
7)
8)
9)
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
SHUNT_
POSITION
Installed*
IN_-_PIN
AC-grounded
AC-coupled to a
user-supplied
negative differential input
DEVICE_
OPERATION
Single-ended
input
Differential
input
10) Enable the audio source.
11) Verify that the speakers are playing the audio
source signal.
Not installed
*Default
position.
2_ _ _______________________________________________________________________________________
MAX98303 Evaluation Kit
Evaluates: MAX98303
The EV kit features 3-pin jumper JU2 to control the
active-low shutdown input. Drive
SHDN
high to place the
device in normal operation; drive
SHDN
low to place the
device in the low-power shutdown mode. See Table 2 for
shunt positions.
The EV kit features 5-pin jumper JU3 to control the
device’s five programmable gain settings. See Table 3
for gain-control configuration.
Shutdown Input (SHDN)
Table_3._JU3_Jumper_Selection_(GAIN)
SHUNT_
POSITION
1-2
1-3*
1-4
1-5
Not
installed
*Default
position.
GAIN_PIN
Connected to PVDD through
100kI resistor R1
Connected to PVDD
Connected to GND through
100kI resistor R2
Connected to GND
Unconnected
MAXIMUM_
GAIN_(dB)
9
12
15
18
6
Selectable Gain (GAIN)
Table_2._JU2_Jumper_Selection_(SHDN)
SHUNT_
POSITION
1-2*
2-3
*Default
position.
SHDN_PIN
Connected to PVDD
Connected to GND
DEVICE_
OPERATION
Normal operation
Shutdown mode
________________________________________________________________________________________ _ 3
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