MAX98304EVKIT [MAXIM]
Filterless Operation Passes Radiated Emissions with 60cm of Speaker Cable;
| 型号： | MAX98304EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Filterless Operation Passes Radiated Emissions with 60cm of Speaker Cable |
| 文件： | 总6页 (文件大小：600K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5609; Rev 0; 10/10
MAX98304 Evaluation Kit
General Description
Features
S Filterless Operation Passes Radiated Emissions
The MAX98304 evaluation kit (EV kit) is a fully assembled
and tested circuit board that uses the MAX98304 filterless
Class D amplifier to drive a speaker in portable audio
applications. The EV kit comes with a MAX98304EWL+
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.
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 Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX98304EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
JU3
1
5-pin, 4-way header
10µF Q20%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106M
C1
1
Not installed, inductors—
shorted with PCB trace;
provided with the EV kit:
22µH Q20%, 1A inductors
TOKO A916CY-220M
L1, L2
0
0.1µF Q10%, 16V X7R ceramic
capacitor (0402)
Murata GRM155R71C104K
C2
1
FOUT+, FOUT-,
PVDD, PGND
0.47µF Q10%, 10V X5R
ceramic capacitors (0402)
Murata GRM155R61A474K
4
Binding posts
C3, C4
C5, C6
2
0
OUT+, OUT-
R1, R2
2
2
1-pin headers
100kI Q5% resistors (0402)
Not installed, ceramic
capacitors (0603)
Not installed, resistors (0603);
provided with the EV kit:
22I Q5% resistors (0603)
R3, R4
0
Not installed, ceramic
capacitors (0603);
provided with the EV kit:
0.22µF Q10%, 25V X7R
ceramic capacitors (0603)
Murata GRM188R71E224K
Mono Class D amplifier
(9 WLP)
Maxim MAX98304EWL+
(Top Mark: AIR)
C7–C11
0
U1
1
FB1, FB2
INPUT
JU1
2
1
1
1
0I Q5% resistors (0603)
Black RCA jack
2-pin header
—
—
3
1
Shunts
PCB: MAX98304 EVALUATION
KIT+
JU2
3-pin header
_______________________________________________________________ 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.
MAX98304 Evaluation Kit
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TOKO America, Inc.
PHONE
WEBSITE
770-436-1300
847-297-0070
www.murata-northamerica.com
www.tokoam.com
Note: Indicate that you are using the MAX98304EWL+ when contacting these component suppliers.
Quick Start
Recommended Equipment
Detailed Description of Hardware
The MAX98304 EV kit features the MAX98304 filterless
Class D amplifier, designed to drive a mono speaker
in portable audio applications. The EV kit comes with a
MAX98304EWL+ 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.
•ꢀ MAX98304ꢀEVꢀkit
•ꢀ 5V,ꢀ2AꢀDCꢀsupply
•ꢀ 4I speaker
•ꢀ Monoꢀaudioꢀsignalꢀsource
Procedure
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.
JU1 configures the EV kit inputs for single-ended or
differential operation. JU2 enables or disables the
speaker amplifier. The amplifier overall gain can be set
between 0dB and +12dB using 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.
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 out-
puts to the PVDD and PGND pads or binding posts
on the EV kit, respectively.
Input Mode
JU1 provides the option to select between a differential
or single-ended input mode for the EV kit. See Table 1
for JU1 configuration.
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- pads on the EV kit.
Table 1. Input Mode (JU1)
5) Connect the speaker across the FOUT+ and FOUT-
test points.
SHUNT
POSITION
IN- PCB PAD
INPUT MODE
Single-ended
input
6) Set the power-supply output to 5V.
7) Enable the power-supply output.
8) Enable the audio source.
Installed*
Connected to PGND
Connected to a
user-supplied negative
differential input
Differential
input
Not installed
9) Verify that the speaker is playing the audio source
signal.
*Default position.
2
______________________________________________________________________________________
MAX98304 Evaluation Kit
The IC can pass CE EN55022B regulations with 60cm
of speaker cable and no filtering. However, ferrite-bead
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- pads.
Shutdown
JU2 enables or disables the audio speaker amplifier. See
Table 2 for JU2 configuration.
Gain Setting
The EV kit maximum signal gain can be configured to
five different settings. JU3 selects the overall gain for the
EV kit. See Table 3 for JU3 configuration.
Filtered Output
Audio analyzers typically cannot accept pulse-width-
modulated (PWM) signals at their inputs. Therefore, the
EV kit features the option to install a lowpass filter at its
outputs to ease evaluation. OUT+ and OUT- are shorted
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.
Filterless Output
The EV kit’s filterless outputs (OUT+ and OUT-) can be
connected directly to a speaker load without any filtering.
Use the OUT+ and OUT- test points or the FOUT+ and
FOUT- pads to connect a speaker directly to the IC out-
puts. Inductors L1 and L2 are not installed for maximum
efficiency.
Table 3. Gain Setting (JU3)
SHUNT
POSITION
MAXIMUM
GAIN (dB)
GAIN PIN
Open
Not connected
0
Connected to PVDD
through R1
1-2
+3
+6
+9
+12
Table 2. Shutdown (JU2)
1-3
Connected to PVDD
SHUNT
POSITION
AMPLIFIER
SHDN PIN
Connected to PGND
through R2
1-4
1-2*
2-3
Connected to PVDD
Connected to PGND
Enabled
Disabled
1-5*
Connected to PGND
*Default position.
*Default position.
_______________________________________________________________________________________
3
MAX98304 Evaluation Kit
Figure 1. MAX98304 EV Kit Schematic
4
______________________________________________________________________________________
MAX98304 Evaluation Kit
1.0”
1.0”
Figure 2. MAX98304 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX98304 EV Kit PCB Layout—Component Side
1.0”
Figure 4. MAX98304 EV Kit PCB Layout—Solder Side
_______________________________________________________________________________________
5
MAX98304 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
10/10
Initial release
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
6
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
©
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