MAX98400BEVKIT [MAXIM]
MAX98400B Evaluation Kit;
| 型号： | MAX98400BEVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX98400B Evaluation Kit |
| 文件： | 总12页 (文件大小：931K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5505; Rev 0; 9/10
MAX98400B Evaluation Kit
General Description
Features
S 8V to 28V Single DC Power-Supply Operation
The MAX98400B evaluation kit (EV kit) configures the
MAX98400B Class D amplifier to drive 2x12W into a pair
of 8I speakers in stereo mode for audio applications.
The EV kit operates from an 8V to 28V DC power supply.
The EV kit has a programmable gain and the jumper set-
tings default to a +20.1dB gain. The EV kit accepts a pair
of single-ended or differential input signals and provides
two sets of differential outputs for speakers.
S Fully Differential Inputs and Outputs
S Drives 2x12W into 8I Speakers in Stereo Mode
S Limiter Control
S Thermal Foldback
S Shutdown Control
S Evaluates the MAX98400B in a 24-Pin TQFN
The EV kit has two independent amplifier circuits, dem-
onstrating direct speaker driving (for low component
count) and filtered output driving (for ease of evaluation).
The EV kit comes with two MAX98400BETG+ devices
installed.
Package with an Exposed Pad
S U1 Configured for Filterless Output
S U2 Configured for Filtered Output
S Fully Assembled and Tested
The EV kit provides an option to control the limiter,
thermal foldback, input configuration, gain, and shut-
down mode of the device. The EV kit includes convenient
audio input and output connectors.
Ordering Information
PART
TYPE
MAX98400BEVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
FILTERLESS EVALUATION (U1)
GAIN1_1, GAIN2_1,
LIM_1
3
3-pin headers
220FF Q20%, 35V electrolytic
capacitor (radial leaded,
5mm spacing), 10mm
INL1
INR1
1
1
White phono jack
Red phono jack
C101
1
diameter x 12.5mm high
Panasonic EEU-FM1V221
JU104, JU105,
SHDN_1, TEMP_1
4
0
0
0
2-pin headers
1FF Q10%, 50V X7R ceramic
capacitors (0805)
TDK C2012X7R1H105K
Not installed, multipurpose
test points
C102A, C102B
C103, C104
2
2
L1+, L1-, R1+, R1-
R101, R103, R104,
R105
1FF Q10%, 10V X7R ceramic
capacitors (0603)
Not installed, resistors (0603)
Not installed, potentiometer
(3/8in)
Murata GRM188R71A105K
R106
1FF Q10%, 25V X7R ceramic
capacitors (0805)
Murata GRM21BR71E105K
R107
1
4
100kI Q5% resistor (0603)
0I Q5% resistors (0805)
C105–C108
C111–C114
FB1
4
0
1
R111–R114
SPKL1+, SPKL1-,
SPKR1+, SPRK1-
Not installed, ceramic
capacitors (0603)
4
Binding posts
Stereo Class D audio
amplifier (24 TQFN-EP*)
Maxim MAX98400BETG+
22I at 100MHz ferrite bead
(0805)
U1
1
Murata BLM21PG220SN1D
_______________________________________________________________ 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.
MAX98400B Evaluation Kit
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
INL2
QTY
DESCRIPTION
White phono jack
1
1
2
600I at 100MHz, 150mI
DCR, 2A ferrite beads (0805)
Würth Elektronik 742792040
—
10
INR2
Red phono jack
2-pin headers
JU204, JU205
330pF Q10%, 50V X7R
ceramic capacitors (0603)
TDK C1608X7R1H331K
33FH Q20%, 3.1A inductors
Sumida CDRH127NP-330NC
L20–L23
4
0
0
—
10
R201, R203,
R204, R205
Not installed, resistors (0603)
FILTERED EVALUATION (U2)
220FF Q20%, 35V electrolytic
capacitor (radial leaded,
5mm spacing), 10mm
diameter x 12.5mm high
Panasonic EEU-FM1V221
Not installed, potentiometer
(3/8in)
R206
C201
1
R207
1
4
100kI Q5% resistor (0603)
15I Q5% resistors (1206)
R226–R229
Stereo Class D audio
amplifier (24 TQFN-EP*)
Maxim MAX98400BETG+
1FF Q10%, 50V X7R ceramic
capacitors (0805)
TDK C2012X7R1H105K
U2
1
C202A, C202B
C203, C204
C205–C208
2
2
4
8
2
COMMON TO BOTH SIDES
1FF Q10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A105K
0.1FF Q10%, 50V X7R
ceramic capacitor (0603)
Murata GRM188R71H104K
C1
C2
D1
1
1
1
1FF Q10%, 25V X7R ceramic
capacitors (0805)
Murata GRM21BR71E105K
1FF Q10%, 10V X7R ceramic
capacitor (0603)
Murata GRM188R71A105K
0.15FF Q10%, 50V X7R
ceramic capacitors (0805)
Murata GRM21BR71H154K
C220–C223,
C226–C229
4.3V, 20mA zener diode
(SOT23)
Central Semi CMPZ5229B
0.68FF Q10%, 50V X7R
ceramic capacitors (0805)
Murata GRM21BR71H684K
JU1
1
2
3-pin header
C224, C225
PGND, PVDD
Binding posts
10kI Q5% resistor (0603)
Shunts
R1
—
1
22I ferrite bead (0805)
Murata BLM21PG220SN1D
FB2
1
4
3
13
PCB: MAX98400B
EVALUATION KIT+
FOUTL2+, FOUTL2-,
FOUTR2+, FOUTR2-
—
1
Binding posts
3-pin headers
*EP = Exposed pad.
GAIN1_2, GAIN2_2,
LIM_2
Component Suppliers
SUPPLIER
Central Semiconductor Corp.
Murata Electronics North America, Inc.
Panasonic Corp.
PHONE
WEBSITE
631-435-1110
770-436-1300
800-344-2112
847-545-6700
847-803-6100
201-785-8800
www.centralsemi.com
www.murata-northamerica.com
www.panasonic.com
Sumida Corp.
www.sumida.com
TDK Corp.
www.component.tdk.com
www.we-online.com
Würth Electronik GmbH & Co. KG
Note: Indicate that you are using the MAX98400B when contacting these component suppliers.
2
______________________________________________________________________________________
MAX98400B Evaluation Kit
1) Verify that all jumpers are in their default positions, as
Quick Start
Required Equipment
shown in Table 2.
2) If not using the filterless evaluation side, remove the
•ꢀ MAX98400BꢀEVꢀkit
shunt from SHDN_1 (disable).
•ꢀ 8Vꢀtoꢀ28V,ꢀ3AꢀDCꢀpowerꢀsupply
•ꢀ Audioꢀsourceꢀwithꢀvolumeꢀcontrolꢀ(e.g.,ꢀCDꢀplayer)
•ꢀ Twoꢀspeakers
3) Connect the first speaker across the FOUTL2- and
FOUTL2+ PCB binding posts.
4) Connect the second speaker across the FOUTR2-
and FOUTR2+ PCB binding posts.
Procedure—Filterless Evaluation (U1)
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.
5) Connect the positive terminal of the power supply
to the PVDD binding post and the power-supply
ground terminal to the PGND binding post.
6) Connect the left output terminal of the audio source
to the INL2 RCA phono jack.
1) Verify that all jumpers are in their default positions,
as shown in Table 1.
7) Connect the right output terminal of the audio source
to the INR2 RCA phono jack.
2) If not using the filtered evaluation side, remove the
shunt from SHDN_2 (disable).
8) Turn on the audio source at minimum volume.
9) Turn on the power supply.
3) Connect the first speaker across the SPKL1- and
SPKL1+ PCB binding posts.
10) Gradually increase the audio source volume until
audio is heard through the loud speakers.
4) Connect the second speaker across the SPKR1-
and SPKR1+ PCB binding posts.
Detailed Description of Hardware
5) Connect the positive terminal of the power supply
to the PVDD binding post and the power-supply
ground terminal to the PGND binding post.
The MAX98400B EV kit provides a proven layout for
evaluating the MAX98400B. The EV kit is designed to
evaluate the device in a 24-pin TQFN package with an
exposed pad. The device is a Class D amplifier that can
be configured to drive 2x12W into a pair of 8I speak-
ers. The EV kit operates from a DC power supply that
provides 8V to 28V and 3A of current. The EV kit PCB is
designed with two layers and has 2oz copper for opti-
mized power dissipation. Each side of the EV kit accepts
a pair of differential or single-ended input signals and
provides two sets of amplified differential audio outputs.
6) Connect the left output terminal of the audio source
to the INL1 RCA phono jack.
7) Connect the right output terminal of the audio source
to the INR1 RCA phono jack.
8) Turn on the audio source at minimum volume.
9) Turn on the power supply.
10) Gradually increase the audio source volume until
audio is heard through the loud speakers.
Optional External Preamplifier
Power Supply (VS)
Procedure—Filtered Evaluation (U2)
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.
The EV kit provides input pads (VS1 for U1 and VS2 for
U2) to accept an optional 5V external power supply for
powering the device’s preamplifiers. The external power
supply for the preamplifiers must be in the 4.5V to 5.5V
range. Refer to the MAX98400A/MAX98400B IC data
sheet for more information.
_______________________________________________________________________________________
3
MAX98400B Evaluation Kit
Filterless Output (U1)
Filtered Output (U2)
The EV kit’s filterless outputs (SPKL1+/SPKL1- and
SPKR1+/SPKR1-) can be connected directly to a pair of
speaker loads without any filtering.
Audio analyzers typically cannot accept pulse-width
modulated (PWM) signals at their inputs. Therefore,
the EV kit features a pair of lowpass filters at each of
the outputs to ease evaluation. Use the filtering output
posts (FOUTL2+/FOUTL2- and FOUTR2+/FOUTR2-) to
connect the filtered PWM outputs to the audio analyzer.
The default lowpass filters at the EV kit outputs are opti-
mized for a pair of 8I power resistors or 8I speakers.
Output Filtering Requirements (U1)
The device can pass CE EN55022B regulations with only
ferrite-bead filters, especially when speaker-wire lengths
are less than or equal to 1m. To install the ferrite-bead
filters, first remove the 0I resistors (R111–R114). Next,
replace resistors R111–R114 with ferrite beads listed
in Table 3 (provided with the EV kit), and install filter
capacitors on the C111–C114 pads. The speaker wire
should be connected to the L1+/L1- and R1+/R1- test
points. Although component selection for the output filter
is dependent on speaker-wire length, the components in
Table 3 are provided with the EV kit as a starting point.
Final component selection should be determined during
EMC testing. Contact the factory, if required. Note that
an inductive load is required at this terminal. If using an
8Ipower resistor, add a 68FH series inductor. If using a
4I power resistor, add a 33FH series inductor.
Thermal Foldback
As shipped from the factory, the thermal-foldback
feature is enabled (TEMP_1 and TEMP_2 jumpers open).
To disable thermal foldback, install a shunt across the
TEMP_1 or TEMP_2 jumper. Refer to the MAX98400A/
MAX98400B IC data sheet for information on selecting
this resistor value.
Limiter
As shipped from the factory, the limiter-threshold control
is disabled. To enable the limiter in PVDD tracking mode,
move the LIM_1 or LIM_2 shunt to the 2-3 position. To
enable the limiter in programmable mode, leave the
LIM_1 or LIM_2 jumper open and select appropriate val-
ues for R103, R104, and R105 or R203, R204, and R205.
Refer to the MAX98400A/MAX98400B IC data sheet for
information on selecting these component values.
Table 1. Jumper Descriptions (U1)
SHUNT
POSITION
SHUNT
POSITION
JUMPER
DESCRIPTION
JUMPER
DESCRIPTION
Single-ended input mode; U1
INL- = GND
Normal operation; U1 SHDN =
DVDD (external logic-high)
1-2*
1-2*
SHDN_1
JU104
Open
Shutdown; U1 SHDN = GND
Differential input mode; U1 INL-
is not connected to GND
Open
1-2*
Thermal foldback enabled; U1
TEMPLOCK = unconnected
Open*
Single-ended input mode; U1
INR- = GND
TEMP_1
LIM_1
Thermal foldback disabled; U1
TEMPLOCK = GND
1-2
1-2*
2-3
JU105
Differential input mode; U1 INR-
is not connected to GND
Open
Limiter disabled; U1 LIM_TH =
VS1
1-2
2-3*
U1 G1 = VS1
GAIN1_1
GAIN2_1
U1 G1 = GND
U1 G1 is not driven
U1 G2 = VS1
Limiter enabled in PVDD tracking
mode; U1 LIM_TH = GND
Open
1-2
Limiter programmable mode; U1
LIM_TH is determined by R103,
R104, and R105
Open
2-3
U1 G2 = GND
U1 G2 is not driven
Open*
*Default position.
4
______________________________________________________________________________________
MAX98400B Evaluation Kit
Table 2. Jumper Descriptions (U2)
Table 3. Recommended EMI Filter
Components for 8I Loads
SHUNT
POSITION
JUMPER
DESCRIPTION
DESIGNATION
DESCRIPTION
Normal operation; U2 SHDN =
DVDD (external logic high)
600I at 100MHz, 150mI DCR,
2A ferrite beads (0805)
1-2*
R111–R114
SHDN_2
Würth Elektronik 742792040
Open
Shutdown; U2 SHDN = GND
Thermal foldback enabled; U2
TEMPLOCK = unconnected
330pF Q10%, 50V X7R
Open*
ceramic capacitors (0603)
Murata GRM188R71H331K or
TDK C1608X7R1H331K
TEMP_2
LIM_2
C111–C114
Thermal foldback disabled; U2
TEMPLOCK = GND
1-2
1-2*
2-3
Note: 3A current-rating ferrite beads are recommended for 4I
Limiter disabled; U2 LIM_TH =
VS2
load drive.
Limiter enabled in PVDD tracking
mode; U2 LIM_TH = GND
Table 4. Gain Jumper Descriptions*
SHUNT POSITION
Limiter programmable mode; U2
LIM_TH is determined
GAIN (dB)
GAIN1_1, GAIN1_2
GAIN2_1, GAIN2_2
Open
by R203, R204, and R205
2-3
Open
1-2
9.0
13.0
2-3
Single-ended input mode; U2
INL- = GND
1-2*
Open
1-2*
16.7
JU204
JU205
2-3
20.1
Differential input mode; U2 INL-
is not connected to GND
Open
1-2
Open
1-2
23.3
26.4
Single-ended input mode; U2
INR- = GND
2-3
29.8
Open
1-2
32.9
Differential input mode; U2 INR-
is not connected to GND
Open
Reserved
1-2
2-3*
U2 G1 = VS2
*GAIN1_1 and GAIN2_1 set the gain for U1.
GAIN1_2 and GAIN2_2 set the gain for U2.
GAIN1_2
GAIN2_2
U2 G1 = GND
U2 G1 is not driven
U2 G2 = VS2
Open
1-2
2-3
U2 G2 = GND
U2 G2 is not driven
Open*
*Default position.
_______________________________________________________________________________________
5
MAX98400B Evaluation Kit
Figure 1a. MAX98400B EV Kit Schematic (Sheet 1 of 3)
6
______________________________________________________________________________________
MAX98400B Evaluation Kit
Figure 1b. MAX98400B EV Kit Schematic (Sheet 2 of 3)
_______________________________________________________________________________________
7
MAX98400B Evaluation Kit
Figure 1c. MAX98400B EV Kit Schematic (Sheet 3 of 3)
8
______________________________________________________________________________________
MAX98400B Evaluation Kit
Figure 2. MAX98400B EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
9
MAX98400B Evaluation Kit
Figure 3. MAX98400B EV Kit PCB Layout—Component Side
10 _____________________________________________________________________________________
MAX98400B Evaluation Kit
Figure 4. MAX98400B EV Kit PCB Layout—Solder Side
______________________________________________________________________________________ 11
MAX98400B Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
9/10
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.
12
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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