19-6216; Rev 0; 2/12
MAX98314 Evaluation Kit
Evaluates: MAX98314
General Description
The MAX98314 evaluation kit (EV kit) is a fully assembled
and tested circuit board that uses the MAX98314 filterless
Class D amplifier to drive a speaker in portable audio
applications. The EV kit comes with a MAX98314EWL+
in a 9-bump, 0.3mm pitch wafer-level package (WLP).
Designed to operate from a 2.5V to 5.5V DC power
supply, the EV kit is capable of delivering 3.2W into a
4I load. The EV kit accepts differential or single-ended
input signals.
S
Integrated Audio Input Capacitors
S
Filterless Operation Passes Radiated Emissions
with 60cm of Speaker Cable
S
2.5V to 5.5V Single-Supply Operation
S
3.2W Mono Class D Output
S
Selectable Gain Control
S
Differential or Single-Ended Input
S
Low-Power Shutdown Input
S
Proven PCB Layout
S
Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
Features
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
10FF
Q20%,
6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106M
0.1FF
Q10%,
16V X7R ceramic
capacitor (0402)
Murata GRM155R71C104K
Not installed, ceramic capacitors
(0603)
Not installed, ceramic capacitors
(0603)
Provided with the EV kit:
0.22FF
Q10%,
25V X7R ceramic
capacitors (0603)
Murata GRM188R71E224K
0I
Q5%
resistors (0603)
Black RCA jack
2-pin header
3-pin header
5-pin header
DESIGNATION
QTY
DESCRIPTION
Not installed, inductors—
shorted with PC trace
Provided with the EV kit:
22FH
Q20%,
1A inductors
TOKO A916CY-220M
Binding posts
1-pin headers
100kI
Q5%
resistors (0402)
Not installed, resistors (0603)
Provided with the EV kit:
22I
Q5%
resistors (0603)
Mono Class D amplifier (9 WLP)
Maxim MAX98314EWL+
(Top Mark: +AKA)
Shunts
PCB: MAX98314 EVALUATION
KIT
L1, L2
0
C2
1
C5, C6
0
FOUT+, FOUT-,
PVDD, PGND
OUT+, OUT-
R1, R2
R3, R4
4
2
2
0
C7–C11
0
FB1, FB2
INPUT
JU1
JU2
JU3
2
1
1
1
1
U1
—
—
1
3
1
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 MAX98314EWL+ 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.
MAX98314 Evaluation Kit
Evaluates: MAX98314
Quick Start
• MAX98314 EV kit
• 5V, 2A DC supply
• 4I
speaker
• Mono audio signal source
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: Installed (single-ended input)
JU2: Pins 1-2 (device enabled)
JU3: Pins 1-5 (12dB gain)
2) Connect the power-supply positive and negative
outputs to the PVDD and PGND PCB pads or binding
posts on the EV kit, respectively.
3) Verify that the audio source output is disabled.
4) Connect the mono audio source to the INPUT RCA jack
or between the IN+ and IN- PCB pads on the EV kit.
5) Connect the speaker across the FOUT+ and FOUT-
test points.
6) Set the power-supply output to 5V.
7) Enable the power-supply output.
8) Enable the audio source.
9) Verify that the speaker is playing the audio source signal.
Detailed Description of Hardware
The MAX98314 EV kit features the MAX98314 filterless
Class D amplifier, designed to drive a mono speaker
in portable audio applications. The EV kit comes with a
MAX98314EWL+ in a 9-bump, 0.3mm pitch WLP. The EV
kit operates from a DC power supply that provides 2.5V
to 5.5V and 2A of current. The EV kit accepts a differential
or single-ended audio input. The audio input source is
amplified to drive 3.2W into a 4I speaker.
Jumper JU1 configures the EV kit inputs for single-ended
or differential operation. Jumper JU2 enables or disables
the speaker amplifier. The amplifier overall gain can be
set between 0dB and +12dB using jumper JU3. The
EV kit provides a set of differential outputs. The device
outputs (FOUT+, FOUT-) can be connected directly to
a speaker load without any filtering with 60cm of cable.
However, filter components can be added to ease
evaluation. See the
Filtered Output
section for additional
information.
Jumper JU1 provides the option to select between a
differential or single-ended input mode for the EV kit. See
Table 1 for JU1 configuration.
Jumper JU2 enables or disables the audio speaker
amplifier. See Table 2 for JU2 configuration.
Recommended Equipment
Procedure
Input Mode
Shutdown
The EV kit maximum signal gain can be configured to five
different settings. Jumper JU3 selects the overall gain for
the EV kit. See Table 3 for JU3 configuration.
Gain Setting
Table 1. Input Mode (JU1)
SHUNT
POSITION
Installed*
Not installed
IN- PCB PAD
Connected to PGND
Connected to a user-supplied
negative differential input
INPUT MODE
Single-ended
input
Differential
input
Table 2. Shutdown (JU2)
SHUNT
POSITION
1-2*
2-3
*Default position.
SHDN
PIN
Connected to PVDD
Connected to PGND
AMPLIFIER
Enabled
Disabled
*Default position.
Table 3. Gain Setting (JU3)
SHUNT POSITION
Open
1-2
1-3
1-4
1-5*
*Default position.
_________________________________________________________________
Maxim Integrated Products
2
GAIN PIN
Not connected
Connected to PVDD through R1
Connected to PVDD
Connected to PGND through R2
Connected to PGND
MAXIMUM GAIN (dB)
0
+3
+6
+9
+12
MAX98314 Evaluation Kit
Evaluates: MAX98314
Audio analyzers typically cannot accept pulse-width-
modulated (PWM) signals at their inputs. Therefore, the
EV kit features the possibility to install a lowpass filter at
its outputs to ease evaluation. OUT+ and OUT- are short-
ed to FOUT+ and FOUT-. The trace must be broken at
L1 and L2 before installing inductors L1 and L2 (provided
with the EV kit). The filter components (C7–C11, R3, and
R4) are provided with the EV kit and must be installed
prior to operation. Use FOUT+ and FOUT- to connect the
filtered PWM outputs to an audio analyzer. The default
lowpass filter at the EV kit outputs is optimized for an 8I
speaker. Contact the factory for the 4I speaker filter.
The IC can pass CE EN55022B regulations with 60cm
of speaker cable and no filtering. However, ferrite-bead
Filtered Output
filters can be used to achieve further attenuation of radi-
ated emissions. To install the ferrite-bead filters, replace
shorting resistors FB1 and FB2 with 0603 or smaller
ferrite beads and install filter capacitors on the C5 and
C6 pads. The speaker wire should be connected to the
FOUT+ and FOUT- PCB pads.
The EV kit’s filterless outputs (OUT+ and OUT-) can be
connected directly to a speaker load without any filter-
ing. Use the OUT+ and OUT- test points or the FOUT+
and FOUT- PCB pads to connect a speaker directly to
the IC outputs. Inductors L1 and L2 are not installed for
maximum efficiency.
Filterless Output
_________________________________________________________________
Maxim Integrated Products
3
MAX98314 Evaluation Kit
Evaluates: MAX98314
Figure 1. MAX98314 EV Kit Schematic
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Maxim Integrated Products
4
MAX98314 Evaluation Kit
Evaluates: MAX98314
1.0”
1.0”
Figure 2. MAX98314 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX98314 EV Kit PCB Layout—Component Side
1.0”
Figure 4. MAX98314 EV Kit PCB Layout—Solder Side
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Maxim Integrated Products
5
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