MAX98400AEVKIT [MAXIM]
MAX98400A Evaluation Kit;
| 型号： | MAX98400AEVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX98400A Evaluation Kit |
| 文件： | 总12页 (文件大小：1001K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5477; Rev 0; 8/10
MAX98400A Evaluation Kit
General Description
Features
S 8V to 28V Single DC Power-Supply Operation
The MAX98400A evaluation kit (EV kit) configures the
MAX98400A Class D amplifier to drive 2x20W into a pair of
8I speakers in stereo mode, or 1x40W into a 4I speaker
in mono mode, for audio applications. The EV kit operates
from an 8V to 28V DC power supply. The EV kit is config-
ured for +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 2x20W into 8I Speakers in Stereo Mode
S Drives 1x40W into 4I Speaker in Mono Mode
S Limiter Control
S Thermal Foldback
S Shutdown Control
The EV kit has two independent MAX98400A circuits,
demonstrating direct speaker driving (for low component
count) and filtered output driving (for ease of evaluation).
The EV kit comes with two MAX98400AETX+ devices
installed.
S Evaluates the MAX98400A in a 36-Pin TQFN
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, shutdown,
and mono mode of the MAX98400A. The EV kit also
provides an input pad to accept an optional external power
supply for powering the device’s preamplifiers. The EV kit
includes convenient audio input and output connectors.
Ordering Information
PART
TYPE
MAX98400AEVKIT+
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 diameter x
12.5mm high
INL1
INR1
1
1
White phono jack
Red phono jack
C101
1
JU104, JU105,
SHDN_1, TEMP_1
Panasonic EEU-FM1V221
4
2-pin headers
1FF Q10%, 50V X7R ceramic
capacitors (0805)
TDK C2012X7R1H105K
C102A, C102B
C103, C104
2
2
L1+, L1-, R1+,
R1-
Not installed, multipurpose test
points
0
0
0
2
0
4
4
MONO_1
Not installed, 2-pin header
Not installed, resistors (0603)
100kI Q5% resistors (0603)
1FF Q10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A105K
R101, R103,
R104, R105
R102, R107
1FF Q10%, 25V X7R ceramic
capacitors (0805)
Murata GRM21BR71E105K
C105–C108
C111–C114
FB1
4
0
1
Not installed, potentiometer
(3/8in)
R106
R111–R114
0I Q5% resistors
Not installed, ceramic
capacitors (0603)
SPKL1+, SPKL1-,
SPKR1+, SPRK1-
Binding posts
22I at 100MHz ferrite bead
(0805)
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.
MAX98400A Evaluation Kit
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
GAIN1_2,
GAIN2_2, LIM_2
Stereo Class D audio amplifier
(36 TQFN-EP*)
3
3-pin headers
U1
1
Maxim MAX98400AETX+
INL2
INR2
1
1
White phono jack
Red phono jack
600Iat 100MHz, 150mIDCR,
2A ferrite beads (0805)
Würth Elektronik 742792040
—
—
10
10
JU204, JU205,
SHDN_2, TEMP_2
4
2-pin headers
330pF Q10%, 50V X7R
ceramic capacitors (0603)
TDK C1608X7R1H331K
33FH Q20%, 3.0A inductors
(12.3mm x 12.3mm)
Sumida CDRH127NP-330NC
L20–L23
MONO_2
4
FILTERED EVALUATION (U2)
0
0
2
0
4
Not installed, 2-pin header
Not installed, resistors (0603)
100kI Q5% resistors (0603)
R201, R203,
R204, R205
220FF Q20%, 35V electrolytic
capacitor (radial leaded, 5mm
spacing), 10mm diameter x
12.5mm high
C201
1
R202, R207
Not installed, potentiometer
(3/8in)
R206
Panasonic EEU-FM1V221
R226–R229
15I Q5% resistors (1206)
1FF Q10%, 50V X7R ceramic
capacitors (0805)
TDK C2012X7R1H105K
C202A, C202B
C203, C204
C205–C208
2
2
4
8
Stereo Class D audio amplifier
(36 TQFN-EP*)
Maxim MAX98400AETX+
U2
1
1FF Q10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A105K
COMMON TO BOTH SIDES
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 (1206)
Murata GRM31MR71H684K
C224, C225
FB2
2
1
JU1
1
2
3-pin header
PGND, PVDD
Binding posts
10kI Q5% resistor (0603)
Shunts
22I ferrite bead (0805)
Murata BLM21PG220SN1D
R1
—
1
13
FOUTL2+,
FOUTL2-,
FOUTR2+,
FOUTR2-
PCB: MAX98400A
EVALUATION KIT+
—
1
4
Binding posts
*EP = Exposed pad.
2
______________________________________________________________________________________
MAX98400A Evaluation Kit
Component Suppliers
SUPPLIER
Central Semiconductor Corp.
Murata Electronics North America, Inc.
Panasonic Corp.
PHONE
WEBSITE
www.centralsemi.com
631-435-1110
770-436-1300
800-344-2112
847-545-6700
847-803-6100
201-785-8800
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 MAX98400A when contacting these component suppliers.
Procedure—Filtered Evaluation (U2)
Quick Start
Required Equipment
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.
•ꢀ MAX98400A EV kit
•ꢀ 8V to 28V, 5A DC power supply
•ꢀ Audio source with volume control (e.g., CD player)
•ꢀ Two speakers
1) Verify that all jumpers are in their default positions,
as shown in Table 2.
2) If not using the filterless evaluation side, remove the
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.
shunt on SHDN_1 (disable).
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.
1) Verify that all jumpers are in their default positions,
as shown in Table 1.
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.
2) If not using the filtered evaluation side, remove the
shunt on SHDN_2 (disable).
6) Connect the left output terminal of the audio source
to the INL2 RCA phono jack.
3) Connect the first speaker across the SPKL1- and
SPKL1+ PCB binding posts.
7) Connect the right output terminal of the audio
source to the INR2 RCA phono jack.
4) Connect the second speaker across the SPKR1-
and SPKR1+ PCB binding posts.
8) Turn on the audio source at minimum volume.
9) Turn on the power supply.
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.
10) Gradually increase the audio source volume until
audio is heard through the loud speakers.
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.
_______________________________________________________________________________________
3
MAX98400A Evaluation Kit
EMC testing. Contact the factory, if required. Note that
Detailed Description of Hardware
an inductive load is required at this terminal. If using an
8Ω power resistor, add a 68µH series inductor. If using a
4Ω power resistor, add a 33µH series inductor.
The MAX98400A EV kit provides a proven layout for eval-
uating the MAX98400A. The EV kit is designed to evaluate
the device in a 36-pin TQFN package with an exposed
pad. The device is a Class D amplifier that can be config-
ured to drive 2x20W into a pair of 8Ω speakers, or 1x40W
into a 4Ω speaker. The EV kit operates from a DC power
supply that provides 8V to 28V and 5A of current. The EV
kit PCB is designed with two layers and has 2oz copper
for optimized 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.
Filtered Output (U2)
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 8Ω power resistors or 8Ω speakers.
Mono Mode (MONO)
The EV kit is preconfigured for stereo mode at the facto-
ry. To change the EV kit to operate in mono mode, short
jumper MONO_1 (U1) or MONO_2 (U2) with a shorting
wire, connect SPKL1- to SPKR1- (U1) or FOUTL2- to
FOUTR2- (U2) with a short banana-lead cable, and
connect SPKL1+ to SPKR1+ (U1) or FOUTL2+ to
FOUTR+2 (U2) with a short banana-lead cable. Connect
the audio input source to the INL1 or INL2 RCA jack.
Optional External Preamplifier
Power Supply (VS)
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 when the internal
regulator is disabled. The external power supply for the
preamplifiers must be in the 4.5V to 5.5V range.
Filterless Output (U1)
The EV kit’s filterless outputs (SPKL1+/SPKL1- and
SPKR1+/SPKR1-) can be connected directly to a pair of
speaker loads without any filtering.
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 and TEMP_2 jumpers. Refer to the MAX98400A/
MAX98400B IC data sheet.
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 0Ω 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
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.
4
______________________________________________________________________________________
MAX98400A Evaluation Kit
Table 1. Jumper Descriptions (U1)
Table 2. Jumper Descriptions (U2)
SHUNT
POSITION
SHUNT
POSITION
JUMPER
DESCRIPTION
JUMPER
DESCRIPTION
Normal operation; U1 SHDN =
DVDD (external logic-high)
Normal operation; U2 SHDN =
DVDD (external logic-high)
1-2*
1-2*
SHDN_1
SHDN_2
Open
Shutdown; U1 SHDN = GND
Open
Shutdown; U2 SHDN = GND
Thermal foldback enabled; U1
TEMPLOCK = unconnected
Thermal foldback enabled; U2
TEMPLOCK = unconnected
Open*
Open*
TEMP_1
TEMP_2
Thermal foldback disabled; U1
TEMPLOCK = GND
Thermal foldback disabled; U2
TEMPLOCK = GND
1-2
Open*
1-2
1-2
Open*
1-2
Stereo mode; U1 MONO is
pulled to GND by R102
Stereo mode; U2 MONO is pulled
to GND by R202
MONO_1
MONO_2
Mono mode; U1 MONO is pulled
to VS1
Mono mode; U2 MONO is pulled
to VS2
Limiter disabled; U1 LIM_TH =
VS1
Limiter disabled; U2 LIM_TH =
VS2
1-2*
2-3
1-2*
2-3
Limiter enabled in PVDD tracking
mode; U1 LIM_TH = GND
Limiter enabled in PVDD track-
ing; U2 LIM_TH = GND
LIM_1
LIM_2
Limiter programmable mode; U1
LIM_TH is determined by R103,
R104, and R105
Limiter programmable mode; U2
LIM_TH is determined by R203,
R204, and R205
Open
Open
Single-ended input mode; U1
INL- = GND
Single-ended input mode; U2
INL- = GND
1-2*
Open
1-2*
1-2*
Open
1-2*
JU104
JU105
JU204
JU205
Differential input mode; U1 INL-
is not connected to GND
Differential input mode; U2 INL-
is not connected to GND
Single-ended input mode; U1
INR- = GND
Single-ended input mode; U2
INR- = GND
Differential input mode; U1 INR-
is not connected to GND
Differential input mode; U2 INR-
is not connected to GND
Open
Open
1-2
2-3*
U1 G1 = VS1
1-2
2-3*
U2 G1 = VS2
GAIN1_1
GAIN2_1
U1 G1 = GND
U1 G1 is not driven
U1 G2 = VS1
GAIN1_2
GAIN2_2
U2 G1 = GND
U2 G1 is not driven
U2 G2 = VS2
Open
1-2
Open
1-2
2-3
U1 G2 = GND
U1 G2 is not driven
2-3
U2 G2 = GND
U2 G2 is not driven
Open*
Open*
*Default position.
*Default position.
_______________________________________________________________________________________
5
MAX98400A Evaluation Kit
Table 3. Recommended EMI Filter
Table 4. Gain Jumper Descriptions*
Components for 8I Loads
SHUNT POSITION
GAIN (dB)
GAIN1_1, GAIN1_2
GAIN2_1, GAIN2_2
DESIGNATION
DESCRIPTION
2-3
Open
1-2
9.0
13.0
600I at 100MHz, 150mI DCR,
2A ferrite beads (0805)
Würth Elektronik 742792040
R111–R114
2-3
16.7
2-3
20.1
330pF Q10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H331K or
TDK C1608X7R1H331K
Open
1-2
Open
1-2
23.3
C111–C114
26.4
2-3
29.8
Open
1-2
32.9
Note: 3A current-rating ferrite beads are recommended for 4I
load drive.
Reserved
*GAIN1_1 and GAIN2_1 set the gain for U1.
GAIN1_2 and GAIN2_2 set the gain for U2.
PVDD
PVDD2
FB2
FERRITE
PVDD
PVDD1
PVDD1
DVDD
FB1
FERRITE
PVDD
BINDING_POST
R1
10k
JU1
1
3
2
C1
0.1uF
3
1
C2
1uF
PGND
D1
4.3V , 20mA
BINDING_POST
PGND
PGND
Figure 1a. MAX98400A EV Kit Schematic (Sheet 1 of 3)
6
______________________________________________________________________________________
MAX98400A Evaluation Kit
O N O M
3 1
E
R E L E A S
0 2
1 2
2 G
9
N D H S
1 G
8
. C .
N
6 3
5 3
4 3
0 3
9 2
8 2
S V
D N G P
D N G P
D N G P
D N G P
6
7
. C .
N
D D V P
D D V P
D D V P
3 3
. C .
N
2 3
1 3
D N G
D N G
5 1
4 1
Figure 1b. MAX98400A EV Kit Schematic (Sheet 2 of 3)
_______________________________________________________________________________________
7
MAX98400A Evaluation Kit
O N O M
2 G
3 1
9
E S A E L E R
0 2
S H D N
1 2
1 G
8
.
C . N
6 3
5 3
4 3
0 3
9 2
8 2
S V
6
D N G P
D N G P
D N G P
D N G P
.
C . N
7
D D V P
D D V P
D D V P
3 3
2 3
1 3
.
C . N
D N G
D N G
5 1
4 1
Figure 1c. MAX98400A EV Kit Schematic (Sheet 3 of 3)
______________________________________________________________________________________
8
MAX98400A Evaluation Kit
1.0’’
Figure 2. MAX98400A EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
9
MAX98400A Evaluation Kit
1.0’’
Figure 3. MAX98400A EV Kit PCB Layout—Component Side
10 _____________________________________________________________________________________
MAX98400A Evaluation Kit
1.0’’
Figure 4. MAX98400A EV Kit PCB Layout—Solder Side
______________________________________________________________________________________ 11
MAX98400A Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
8/10
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
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2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
©
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