19-5218; Rev 0; 4/10
MAX98302 Evaluation Kit
General Description
The MAX98302 evaluation kit (EV kit) is a fully assembled
and tested PCB that evaluates the MAX98302 stereo
2.4W Class D amplifier. The EV kit operates from a
single 2.6V to 5.5V DC power supply. 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 filter-
less applications; however, a filter can be added to ease
evaluation.
S
2.6V to 5.5V Single-Supply Operation
S
Single-Ended or Differential Audio Input
S
Five Selectable Gains
S
Filterless Operation
S
Optional Class D Output Filters for Ease of
Features
Evaluates: MAX98302
Evaluation
S
Low-Power Shutdown Input
S
Fully Assembled and Tested
Ordering Information
PART
MAX98302EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
10FF
Q20%,
10V X7R ceramic
capacitor (0805)
Murata GRM21BR71A106K
0.1FF
Q10%,
16V X7R ceramic
capacitor (0603)
Murata GRM188R71C104K
1FF
Q10%,
10V X7R ceramic
capacitors (0603)
Murata GRM188R61A105K
Not Installed, capacitors (0603)
0.22FF
Q10%,
25V X7R ceramic
capacitors (0603)
Murata GRM188R71E224K
0I
Q5%
resistors (0603)
2-pin headers
DESIGNATION QTY
JU2
JU3
1
1
DESCRIPTION
3-pin header
5-pin header
Not installed, 22FH
Q20%,
1.29A
inductors
TOKO A916CY-220M
(provided with EV kit)
Red multipurpose test points
White multipurpose test points
100kI
Q5%
resistors (0603)
22I
Q5%
resistors (0603)
2W Class D amplifier
(14 TDFN-EP*)
Maxim MAX98302ETD+
Shunts
PCB: MAX98302 EVALUATION
KIT+
C2
1
L1–L4
0
C3, C4,
C17, C18
C5, C6,
C20, C21
C7–C16
FB1–FB4
JU1, JU4
OUTL+, OUTR+
OUTL-, OUTR-
R1, R2
R3, R4, R7, R8
U1
—
—
*EP
= Exposed pad.
2
2
2
4
1
4
1
4
0
10
4
2
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TOKO America, Inc.
PHONE
770-436-1300
847-297-0070
www.tokoam.com
WEBSITE
www.murata-northamerica.com
Note:
Indicate that you are using the MAX98302 when contacting these component suppliers.
_______________________________________________________________
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.
MAX98302 Evaluation Kit
Evaluates: MAX98302
Quick Start
•
•
•
2.6V to 5.5V, 2A DC power supply
Stereo audio input
Two 8I speakers
Detailed Description of Hardware
The MAX98302 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 MAX98302
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. To use the
filtering output pads (FOUTL+, FOUTL-, FOUTR+, and
FOUTR-), install inductors L1–L4 (provided separately
with the EV kit), connect the loads to the output pads,
and connect the filtered outputs to the audio analyzer.
The default lowpass filters at the EV kit output are opti-
mized for an 8Ω speaker.
Recommended Equipment
Filterless Output
The MAX98302 EV kit is fully assembled and test-
ed. 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: Pins 1-2 (device enabled)
JU3: Pins 1-3 (12dB gain)
2)
3)
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 PVDD pad on the EV kit.
With the audio source disabled, connect the left
channel of the audio source to the INL+ test pad.
Connect the right channel of the audio source to the
INR+ test 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.
Procedure
Filtered Output
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 shunt positions.
4)
5)
6)
7)
8)
9)
Table 1. JU1 and JU4 Jumper Selection
SHUNT
POSITION
Installed*
Not installed
*Default
position.
IN_- PIN
AC-grounded
AC-coupled to 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.
2
______________________________________________________________________________________
MAX98302 Evaluation Kit
Evaluates: MAX98302
Shutdown Function (SHDN)
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.
Selectable Gain (GAIN)
The EV kit features 5-pin jumper JU3 to control
the MAX98302’s five programmable gain settings. See
Table 3 for gain control configuration.
Table 2. JU2 Jumper Selection (SHDN)
SHUNT
POSITION
1-2*
2-3
*Default
position.
SHDN
PIN
Connected to PVDD
Connected to PGND
DEVICE
OPERATION
Normal operation
Shutdown mode
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 PGND through
100kI resistor R2
Connected to PGND
Unconnected
MAxIMUM
GAIN (dB)
9
12
15
18
6
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3
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