Analog Devices MAX98361 User manual

Evaluates: MAX98361 (WLP) MAX98361 Evaluation System
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General Description
The MAX98361 evaluation system (EV system) is a
fully assembled and tested system that evaluates the
MAX98361A/B/C/D mono Class-D audio amplifiers.
The EV system consist of a MAX98361 Development
Board (DEV board), Maxim’s Audio Interface Board III
(AUDINT3), and a USB cable.
It is recommended that the DEV board be evaluated with
the AUDINT3 board, as an EV system. MAX98361A and
MAX98361C support the standard I2S interface, and
MAX98361B and MAX98361D support standard left-
justified mode. All MAX98361 variants support an
8-channel TDM digital audio interface.
The AUDINT3 board provides the USB-to-PCM interface
in addition to the 1.8V VDDIO supply needed to evaluate
the DEV board. The MAX98361 DEV board requires one
additional supply input, 2.5V to 5.5V (VDD) when evaluat-
ing using the AUDINT3 board. Figure 1 details the DEV
board and the AUDINT3 board.
319-100890; Rev 0; 2/22
Ordering Information appears at end of data sheet.
Features
●2.5V to 5.5V Single-Supply Operation
●I2S, Left-Justified, or TDM Input
●Five Selectable Gains (-3dB, 3dB, 6dB, 9dB, and
12dB)
●Audio Channel Select (Left, Right, and Mono Mix)
●Filterless Operation
●Low EMI
●Complete Hardware System with Easy Setup, No
Tools or Special Software Required
EV System Contents
●MAX98361 Development Board
●Audio Interface Board III
●Micro-USB Cable
Figure 1. Simplified EV System Block Diagram
J2
AUDIO INTERFACE BOARD 3
USB
INTERFACE
MAX98361 DEVELOPMENT BOARD
J1
U1
FOUTN
GND
FOUTP
MAX98361
VIN
J1
D1 S2
BCLK
SW1
S1 S3
L RC LK
DIN
VDDIO
GND
EN
J4
ON
OF F
DAI_ADAI_BDAI_C
J3
J6
J7
J8
GAI N
J5
VDD
DAI
GND

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
Quick Start Guide
Required Equipment
●MAX98361 EV System
• Audio Interface Board III
• 2.5V to 5.5V, 3A DC power supply
• Micro-USB cable
● 4Ω to 8Ω speaker
●USB audio source (e.g., Windows Media Player®or
iTunes®)
●PC with Windows®7 or Windows 10 with available
USB port
Reference Material
●MAX98361 IC data sheet
Procedure
The MAX98361 and AUDINT3 boards are fully assembled
and tested. Follow the steps below to set up the EV sys-
tem for device evaluation.
Note: In the following sections, software-related items are
identified by bolding. Text in bold refers to items directly
from the evaluation software. Text in bold and underlined
refers to items from the Windows operating system.
AUDINT3 Board Setup:
1) Connect the MAX98361 DEV board (2 row J1
connector) to the AUDINT3 board (3 row J1
connector). The bottom row of both J1 connectors
should be lined up so the stando󰀨s on the corners
of the AUDINT3 and DEV board are level.
2) With the audio source disabled, connect the USB
cable from your computer to the USB port (J2) on
the AUDINT3 board. The AUDINT3 board provides
the BCLK and LRCLK signals as well as the power
for VDDIO, sourcing 1.8V to the DEV board through
the J1 connector.
3) The multi-color LED D1 blinks white. When the com-
puter registers the AUDINT3 as a USB device D1
changes to magenta and blink slowly.
DEV Board Setup:
1) With all supplies unpowered, connect the 2.5V to
5.5V power supply across the VIN and GND binding
posts.
2) Connect the micro speaker leads across the FOUTP
and FOUTN binding posts.
3) Place the shunt on jumper J5 across pins VDD and VIN.
4) Set the switch SW1 to the on position.
Test:
1) Enable the supply voltages across each of the
supply pins.
2) Open the Windows’ Sound dialog and select the
Playback tab, A Speakers item similar to Figure 2
should be listed as an available playback device.
3) Verify that the Speakers item is set as the default
device. Once this is done, the AUDINT3 board out-
puts PCM data to the DIN pin on the DEV board.
4) Adjust the audio source volume to a low level.
5) Enable the audio source and verify that audio is
heard through the connected speaker. Adjust the
audio source volume as needed.
6) Quick Start of the Evaluation software is now
complete.
iTunes is a registered trademark of Apple Inc.
Windows is a registered trademark and registered service mark of Microsoft Corporation.
Windows Media is a registered trademark and registered service mark of Microsoft Corporation.
Figure 2. Playback Device

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
Detailed Description of Hardware
The MAX98361 EV system is designed to allow for a thor-
ough evaluation of the MAX98361 digital input Class-D
audio amplifier IC. The EV system includes the MAX98361
development board (DEV board), Maxim’s Audio Interface
Board III (AUDINT3), and a Micro-USB cable.
The MAX98361 DEV board can be evaluated as a stand-
alone board that is driven directly by audio test equipment.
To simplify the evaluation, the DEV board can be evaluated
with the AUDINT3 board, which allows any computer
to become a digital audio source. The AUDINT3 board
provides on-board LDO regulators and a USB-to-PCM
interface to provide an easy-to-use method for exercising
the capabilities of the device with no additional audio
equipment.
The AUDINT3 LDO regulators power the MAX98361
DEV board’s VDDIO pin through connector J1. The
USB-to-PCM converter accepts a USB audio stream
from a USB connected computer and converts that into
an I2S (MAX98361A/C) or left-justified (MAX98361B/
MAX98361D) data stream, allowing for USB audio playback
through the MAX98361 device. Do not use the AUDINT3
board while directly driving the DEV board’s PCM interface
with external audio test equipment since the Digital Audio
Interface (DAI) pins for the DEV board and AUDINT3 are
connected through the J1 header.
Power Supplies
The MAX98361 DEV board requires two external power
supplies when evaluated as a stand-alone board. The
VDD supply provides system power to the MAX98361
IC. This voltage can be applied externally at the VIN and
GND PCB pads, or 5V can be provided from the AUDINT3
board. See Table 2 for the J5 jumper selection. The 5V
supply from the AUDINT3 board should be used only for
functionality tests and should not be used when driving a
speaker load due to the low current limit of the on-board
5V supply.
The voltage applied to the VDDIO test point determines
the logic level of the EN pin when SW1 is in the on position.
The power supplies and their ranges are listed in Table 1.
The external supply voltages can be connected at the
respective supply test-points and/or binding posts.
When using the AUDINT3 board, the AUDINT3’s on-board
LDO regulator independently powers VDDIO on the DEV
board. This power is routed to the DEV board through the
J1 connector. See the Digital Audio Interface section.
Jumper Selection
Shutdown Mode
The DEV board includes switch SW1 to facilitate a device
enable. The device features a low-power shutdown mode
that is activated by setting SW1 in the “OFF” position. To
exit shutdown mode, set SW1 to the “ON” position. When
the PCM master is disabled and SW1 is in the “ON” posi-
tion, the device is in standby mode. Enabling the PCM
interface while SW1 is in the “ON” position puts the device
in active playback mode, and the device output begins
switching.
Table 1. Power Supplies
Table 3. Jumper Configuration
Table 2. J5 Jumper Selection (VDD) Supplies
POWER SUPPLY RANGE (V)
VDD 2.5 to 5.5
VDDIO 1.2 to VDD
HEADER SHUNT POSITION DESCRIPTION
SW1 EN to DVDDIO Normal operation
EN to GND Shutdown
SHUNT POSITION INPUT VOLTAGE (VDD)
1-2 VDD supplied by AUDINT3 board
connected to J1 header
2-3 User-supplied external power supply
applied at the VIN PCB pad

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
Gain and Channel Selection
(I2S/Left-Justied Mode)
The MAX98361’s GAIN_SLOT pin is connected to the
center pin (pin 1) of the J4 header. When operating the
device in I2S or left-justified mode, shunting pin 1 to the
adjacent pins of the J4 header controls the PCM gain.
Table 3 shows the available gain settings in I2S and left-
justified modes.
In I2S and left-justified modes, channel selection is
controlled by placing three shunts across the DAI configu-
ration headers J6, J7, or J8. Each of the DAI configuration
headers represent one valid mapping of the DAI pins to
the PCM input signals. See Table 4 for the valid jumper
settings for the DAI configuration headers. Only one DAI
configuration may be used at a time. Figure 3 shows the
shunt positions used for DAI Configuration A.
Channel Selection (TDM Mode)
In TDM mode, the MAX98361 has a fixed gain of 12dB
and the GAIN_SLOT pin becomes repurposed for TDM
channel selection. The MAX98361 accepts 8-channel
TDM data with either 16-bit or 32-bit data. The GAIN_
SLOT pin and DAI configuration are used to select which
of the 8 channels of TDM data the part responds to, as
shown in Table 6.
Digital Audio Interface
The MAX98361 Digital Audio Interface (DAI) is routed to
interface header J3 as well as the AUDINT3 connector
J1. The interface headers provide easy access to the
device’s PCM bus and the AUDINT3 connector allows for
USB audio to be streamed onto the DEV board. See the
USB Audio Input section for details on USB audio stream-
ing and Table 8 for the AUDINT3 connector J1 pinout.
Table 4. J4 Jumper Selection
(GAIN_SLOT)
Table 5. J6-J8 Header Selection
(DAI Configuration)
Table 6. TDM Mode Channel Selection
Table 7. DAI Header (J3)
Figure 3. DAI Configuration A (Left-Channel for I2S/Left-
Justified Operation)
J4 SHUNT POSITION GAIN_SLOT GAIN
1-2 Connected to VDD through
100kΩ resistor R1 3dB
1-3 Connected to VDD 6dB
1-4 Connected to GND
through 100kΩ resistor R2 -3dB
1-5 Connected to GND 12dB
Not Installed Unconnected 9dB
DAI
CONFIGURATION
SHUNT
HEADER
I2S/LJ
CHANNEL
A J6 Left
B J7 Right
C J8 Monomix
TDM
CHANNEL
J4 SHUNT
POSITION
DAI
CONFIGURATION
0 1-5 A
1 1-3 A
2 Open A
3 1-3 B
4 1-5 B
5 1-5 C
6 Open C
7 1-3 C
SIGNAL PIN PIN SIGNAL
GND 1 2 BCLK
GND 3 4 LRCLK
GND 5 6 DIN
DAI CONFIGURATION A
(LEFT CHANNEL)
J6
J7
J8
DAI0
DAI1
DAI2
BCLK
LRCLK
DIN
BCLK
LRCLK
DIN
BCLK
LRCLK
DIN
DAI1
DAI2
DAI0
DAI2
DAI0
DAI1

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
DAI Header
The DAI header (J3) provide access to MAX98361’s PCM
bus (BCLK, LRCLK, and DIN). This DAI headers facilitate
evaluation with audio equipment I/O. See Table 8 for the
pinout of the DAI header and Figure 4 for an illustration
of how the MAX98361 DAI interface is routed through the
DAI headers from the AUDINT3 connector.
Speaker Output
The MAX98361 audio output is routed to the FOUTP and
FOUTN connections on the DEV board. The DEV board
is, by default, assembled to allow the MAX98361 output
to connect directly to a speaker load without the need for
filtering.
EMI Filter
When long speaker cables are used with the MAX98361
output (exceeding approximately 12in), a ferrite bead plus
capacitor filter can be installed to prevent excessive EMI
radiation. Although it is best to choose filter components
based on EMI test results, the combination of 100pF
capacitors (C3, C4) and ferrite beads (FB1, FB2) generally
work well. Before adding the filters to the design, first
remove the small PCB traces shorting the pads of FB1
and FB2 (see the MAX98361 EV Kit Development Board
Schematic and the MAX98361 EV Kit Development Board
PCB Layout Diagrams).
Table 8. AUDINT3 Connector (J1)
Figure 4. MAX98361 DAI Interface Headers (PCM)
*This row in the J1 header is present on the AUDINT3 J1 header, but not the Dev board J1 header.
SIGNAL* PIN* SIGNAL PIN SIGNAL PIN
— 1 MCLK 2 GND 3
BCLK2 4 BCLK1 5 GPIO1 6
LRCLK2 7 LRCLK1 8 GPIO2 9
DAC2 10 DAC1 11 GPIO3 12
ADC2 13 ADC1 14 GPIO4 15
— 16 ID 17 3.3V 18
AVDD 19 DVDD 20 GND 21
HPVD 22 VDDIO 23 GND 24
GND 25 SDA 26 5V 27
— 28 SCL 29 5V 30
GND 31 IRQ 32 RST 33
— 34 — 35 — 36
GND 37 — 38 — 39
J3
GND SIG
J1
BCLK
LRCLK
DIN

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
Audio Interface Board III
Maxim’s Audio Interface board III (AUDINT3 board) facilitates
the evaluation of the DEV board by providing a set of
features that can be used to exercise the capabilities of
the DEV board without the need for additional audio
equipment. The main components of the AUDINT3
board are its LDO supply voltages and its USB-to-PCM
interfaces. The supply voltages allow the DEV board to be
evaluated with minimal amount of external supplies. The
USB-to-PCM converter allows any computer to be used
as an audio source for the DEV board’s digital audio PCM
interface.
The MAX98361 DEV board connects to the AUDINT3
board through connector J1. The physical connections
made between the DEV board and AUDINT3 board are
listed in Table 8.
USB Audio Input
To utilize the USB streaming feature of the AUDINT3
board, connect the USB cables from your computer to
the USB connector J2 on the AUDINT3 board and ensure
that the AUDINT3 board is connected to the DEV board.
#Denotes RoHS compliant.
PART TYPE
MAX98361AEVSYS#WLP Complete Evaluation System
MAX98361BEVSYS#WLP Complete Evaluation System
MAX98361CEVSYS#WLP Complete Evaluation System
MAX98361DEVSYS#WLP Complete Evaluation System
Ordering Information

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
MAX98361 EV System DEV Board Bill of Materials
ITEM REF_DES DNI/DNP QTY MFG PART # MANUFACTURER VALUE DESCRIPTION COMMENTS
1BCLK, DIN,
EN, LRCLK - 4 5003 KEYSTONE N/A
TEST POINT; PIN DIA=0.1IN; TOTAL LENGTH=0.3IN;
BOARD HOLE=0.04IN; ORANGE; PHOSPHOR
BRONZE WIRE SILVER PLATE FINISH;
2C1 - 1
GRM155R61A106ME44;
GRM155R61A106ME11;
0402ZD106MAT2A;
CL05A106MP5NUNC
MURATA;MURATA;
AVX;SAMSUNG 10UF CAPACITOR; SMT (0402); CERAMIC CHIP; 10UF; 10V; TOL=20%; TG=-55 DEGC TO +85 DEGC; TC=X5R
3C2 - 1 GRM033R61C104K;
C0603X5R1C104K030BC MURATA;TDK 0.1UF
CAPACITOR; SMT (0201); CERAMIC CHIP; 0.1UF;
16V; TOL=10%; MODEL=GRM SERIES;
TG=-55 DEGC TO +85 DEGC; TC=X5R
4
FOUTN, FOUTP,
GND, VIN
- 4 111-2223-001
EMERSON
NETWORK POWER
111-2223-001
MACHINE SCREW; THUMBSCREW; BANANA;
1/4-32IN; 11/32IN; NICKEL PLATED BRASS
5
FOUTN_PAD,
FOUTP_PAD,
GND_PAD1,
GND_PAD2,
VIN_PAD
- 5 9020 BUSS WEICO WIRE MAXIMPAD
EVK KIT PARTS; MAXIM PAD; WIRE; NATURAL;
SOLID; WEICO WIRE; SOFT DRAWN BUS TYPE-S;
20AWG
6GND_TP1 - 1 5011 KEYSTONE N/A
TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN;
BOARD HOLE=0.063IN; BLACK; PHOSPHOR BRONZE
WIRE SILVER PLATE FINISH;
7GND_TP2-
GND_TP4 - 3 5001 KEYSTONE N/A
TEST POINT; PIN DIA=0.1IN; TOTAL LENGTH=0.3IN;
BOARD HOLE=0.04IN; BLACK; PHOSPHOR BRONZE
WIRE SILVER PLATE FINISH;
8J1 - 1 TSW-113-08-S-D-RA SAMTEC TSW-113-08-S-D-RA
CONNECTOR; THROUGH HOLE; DOUBLE ROW;
RIGHT ANGLE; 26PINS
9J3, J6-J8 - 4 PEC03DAAN
SULLINS
ELECTRONICS CORP.
PEC03DAAN
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT THROUGH; 6PINS; -65 DEGC TO +125 DEGC
10 J4 - 1 TSW-105-07-L-S SAMTEC TSW-105-07-L-S
EVKIT PART-CONNECTOR; THROUGH HOLE;
TSW SERIES; SINGLE ROW; STRAIGHT; 5PINS
11 J5 - 1 PEC03SAAN SULLINS PEC03SAAN
CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY;
STRAIGHT; 3PINS
12 J9-J12 - 4
91772A108;
PHILLIPS-PAN_4-40X3/8IN;
PMSSS4400038PH; 9901
GENERIC PART N/A MACHINE SCREW; PHILLIPS; PAN; 4-40; 3/8IN;
18-8 STAINLESS STEEL
13 J9-J12 - 4 MCH_SO_F_HEX_4-40X1/2 GENERIC PART N/A
STANDOFF; FEMALE-THREADED; HEX; 4-40; 1/2IN;
ALUMINUM
14 R1, R2 - 2 RC0603JR-07100KL YAGEO 100K
RESISTOR; 0603; 100K OHM; 5%; 100PPM; 0.1W;
THICK FILM
15 R3 - 1
CRCW06032K0FK;
ERJ-3EKF2001
VISHAY DALE;
PANASONIC
2K
RESISTOR, 0603, 2K OHM, 1%, 100PPM, 0.10W,
THICK FILM
16 R7-R9 - 3 ERJ-2GE0R00 PANASONIC 0
RESISTOR; 0402; 0 OHM; 0%; JUMPER; 0.10W;
THICK FILM
17 R18 - 1 ERJ-2RKF1782 PANASONIC 17.8K
RESISTOR; 0402; 17.8K OHM; 1%; 100PPM;
0.1W; THICK FILM
18 SU1 - 1 C33-GAG1-2X3-G VALCON C33-GAG1-2X3-G
CONNECTOR; FEMALE; 2.54MM MULTI-POSITION
JUMPER LINK; WIREMOUNT; 6PINS
19 SU2, SU3 - 2 S1100-B;SX1100-B;
STC02SYAN
KYCON;KYCON;
SULLINS ELECTRONICS
CORP.
SX1100-B
TEST POINT; JUMPER; STR; TOTAL LENGTH=0.24IN;
BLACK; INSULATION=PBT;PHOSPHOR BRONZE
CONTACT=GOLD PLATED
20 SW1 - 1 CL-SB-12B-01T;
CL-SB-12B-01
NIDEC COPAL
ELECTRONICS CORP
CL-SB-12B-01T;
CL-SB-12B-01
SWITCH; SPDT; SMT; 12V; 0.2A; CL-SB SERIES;
SLIDE SWITCH; RCOIL=0.07 OHM;
RINSULATION=100M OHM
21 U1 - 1 MAX98361 MAXIM MAX98361
EVKIT PART - IC; MAX98361; TINY; LOW-COST;
PCM INPUT CLASS-D AMPLIFIER WITH CLASS-AB
PERFORMANCE; WLP9; PACKAGE CODE: N91E1+1;
PACKAGE OUTLINE: 21-100371
22 VDDIO - 1 5010 KEYSTONE N/A
TEST POINT; PIN DIA=0.125IN; TOTAL
LENGTH=0.445IN; BOARD HOLE=0.063IN; RED;
PHOSPHOR BRONZE WIRE SIL;
23 PCB - 1 MAX98361_WLP_APPS_A MAXIM PCB PCB:MAX98361_WLP_APPS_A -
24 C3, C4, C8-C12 DNP 0N/A N/A OPEN PACKAGE OUTLINE 0402 NON-POLAR CAPACITOR
25 FB1, FB2 DNP 0RC1608J000CS SAMSUNG ELECTRONICS 0
RESISTOR; 0603; 0 OHM; 5%; JUMPER; 0.10W;
THICK FILM
26 OUTN, OUTP DNP 05002 KEYSTONE N/A
TEST POINT; PIN DIA=0.1IN; TOTAL LENGTH=0.3IN;
BOARD HOLE=0.04IN; WHITE; PHOSPHOR BRONZE
WIRE SILVER;
TOTAL 48

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
MAX98361 EV System PCB Schematic
LEFT MONOMIX RIGHT
I2S/LS CHANNEL SHUNT_DAIX
DAI_B DAI_C DAI_A
6dB
-3dB
OPEN
1-4 1-3 1-2 1-5 12dB
I2S/LJ
GAIN
J4
3dB 9dB
VDDIO
3 2 1
SW1
R18
21 21
FB2 FB1
6 5 4 3 2 1
J8
6 5 4 3 2 1
J7
6 5 4 3 2 1
J6
EN
C3
C2
C1
B3
B2
B1
A3
A2
A1
U1
FOUTP
FOUTN
OUTP
C3 C4
C8
OUTN
C9
R1
3
2
1
J5
VIN
C2C1
GND
BCLK LRCLK DIN
C11
R7
C12
R8 R9
C10
2625 2423 2221 2019 1817 1615 1413 1211 109 87 65 43 21
J1
5
4
3
2
1
J4
R2
R3
65 43 21
J3
GND
GND
GND
GND
DIN DAI1
DAI2 DAI0LRCLK
BCLK DIN DAI0
DAI1 DAI2LRCLK
BCLK DIN DAI2
DAI0 DAI1LRCLK
BCLK
BCLK_H LRCLK_H DIN_H
1%2K
VDDIO
GND
VIN
PEC03SAAN
0.1UF 16V
+5V
VDD
17.8K +5V
OPEN OPEN
GND
FOUTP
0
DNP
0
DNP
FOUTN
OPEN OPEN
DAI0 DAI1 DAI2
DIN_H
BCLK_H
LRCLK_H
OPEN
0 0
OPEN OPEN
MAX98361
100K
VDD
100K
VDD
BCLK
LRCLK
DIN
10V 10UF
0
VDDIO
5
1
3
4
2
65
1 3 4
2
6 5
1 34
2
6 5
1 34
2
6 5
1 34
2
GND
DAI0 DAI1
OUTN
GAIN_SLOT
DAI2
VDD
EN
OUTP

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
MAX98361 EV System—Top Silkscreen MAX98361 EV System—Inner 1
MAX98361 EV System—Top MAX98361 EV System—Inner 2
MAX98361 EV System PCB Layout Diagrams
1”

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MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
MAX98361 EV System—Bottom MAX98361 EV System—Bottom Silkscreen
MAX98361 EV System PCB Layout Diagrams (continued)

MAX98361 Evaluation System Evaluates: MAX98361 (WLP)
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REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES CHANGED
0 2/22 Initial release —
Revision History