MAX98088 Evaluation Kit Evaluates: MAX98088

19-5487; Rev 1; 5/11
MAX98088 Evaluation Kit
Features
The MAX98088 evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX98088
audio codec. The MAX98088 IC is an integrated audio
codec including microphone amplifiers, line amplifiers,
an earpiece amplifier, stereo Class D amplifiers, stereo
DirectDriveM headphone amplifiers, and digital signal
processing. The EV kit also includes Windows XPM-,
Windows VistaM-, and WindowsM 7-compatible software
that provides a simple graphical user interface (GUI) for
exercising the features of the IC.
S 2.8V to 5.5V Single-Supply Operation
S Proven Audio PCB Layout
S On-Board USB-to-I2C Interface Circuit
S On-Board USB-to-I2S Converter
S On-Board S/PDIF Transceiver
S On-Board Clock Source
S On-Board Digital Microphone
S Evaluates the MAX98088EWY+ in a 3.8mm x
3.3mm, 63-Bump WLP Package
The EV kit provides access to all analog and digital inputs/outputs on the IC. To enable easy connection to a wide range of audio sources, audio
devices are included to convert both USB data and
S/PDIF data to I2S.
S Windows XP-, Windows Vista-, and Windows
7-Compatible Software
S Fully Assembled and Tested
The EV kit integrates a MAXQ2000 microcontroller to
enable I2C communication with devices on the EV kit.
The EV kit software, running on a Windows PC, communicates with the EV kit over a standard USB port. The EV
kit software provides an intuitive interface to exercise the
functions of the IC.
Ordering Information
PART
USB
POWER
SUPPLY
1.8V
DIGITAL
MIC
POWER
DIGITAL
MIC
DIGITAL
MIC INPUT
MIC
INPUT
MIC
INPUT
MIC/LINE
INPUT
OPTICAL
MICROCONTROLLER
I2C
CONTROL
EV Kit
#Denotes RoHS compliant.
The EV kit comes with a MAX98088EWY+ installed.
2.8V TO 5.5V
TYPE
MAX98088EVKIT#
OPTICAL
S/PDIF
TRANSCEIVER
USB
USB TO I2S
I2S
DIGITAL AUDIO
INTERFACE
I2S
EARPIECE/
LINE OUTPUT
DIGITAL AUDIO
INTERFACE
BYPASS
STEREO ADC
FIXED-FUNCTION
DSP
STEREO ADC
MAX98088
LINE
INPUT
CLASS D
AMPLIFIER
CLASS D
AMPLIFIER
CLASS H
AMPLIFIER
CHARGE
PUMP
Figure 1. Block Diagram
DirectDrive is a registered trademark of Maxim Integrated Products, Inc.
Windows, Windows XP, and Windows Vista are registered trademarks of Microsoft Corp.
________________________________________________________________ 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.
Evaluates: MAX98088
General Description
Evaluates: MAX98088
MAX98088 Evaluation Kit
Component List
DESIGNATION
QTY
DESCRIPTION
4
10FF Q20% 6.3V X5R ceramic
capacitors (0805)
TDK C2012X5R0J106M
C3, C10, C11,
C21, C22, C27,
C29, C35, C40,
C42, C44–C47,
C51
15
0.1FF Q10%, 50V X5R ceramic
capacitors (0603)
TDK C1608X5R1H104K
C4–C9,
C122–C125
10
10pF Q5% 50V C0G ceramic
capacitors (0402)
Murata GRM1555C1H100J
C1, C2, C52,
C70
C12, C55, C56,
C69
4
C14, C15, C23,
C25, C43, C50,
C53, C54
8
C19, C20, C31,
C32, C57
5
C24, C26
C28
0.1FF Q10%, 10V X7R ceramic
capacitors (0402)
KEMET C0402C104K8RAC
1FF Q20% 6.3V X5R ceramic
capacitors (0603)
Taiyo Yuden JMK107B7105MA
0.01FF Q10% 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H103K
2
2.2FF Q10%, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J225K
1
47000pF Q10%, 25V X7R
ceramic capacitor (0603)
Murata GRM188R71E473K
DESIGNATION
QTY
DESCRIPTION
C66, C72
2
47FF Q20%, 6.3V X5R ceramic
capacitors (1206)
Murata GRM31CR60J476M
C67, C68, C71,
C77, C78, C92,
C93, C101–
C104, C114–
C118, C121,
C126–C129,
C131
22
1FF Q10%, 6.3V X5R ceramic
capacitors (0402)
TDK C1005X5R0J105K
C88–C91,
C134–C139
10
0.22FF Q10%, 6.3V X5R ceramic
capacitors (0402)
TDK C1005X5R0J224K
C100
1
10FF Q20% 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106M
C130
1
2.2FF Q20%, 6.3V X5R ceramic
capacitor (0402)
Taiyo Yuden JMK105BJ225MV
D1
1
Yellow LED (0603)
D2
1
Red LED (0603)
EXTMICN,
EXTMICP
0
Not installed, test points
FB1, FB2
2
Ferrite beads (0603)
Murata BLM18PG221SN1
FB3–FB10
8
Ferrite beads (0402)
Murata BLM15HD182SN1
1
0.47FF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J474K
FB11, FB12,
FB14, FB15
4
0I Q5% resistors (0603)
FB13, FB16
2
0I Q5% resistors (0402)
4
8pF Q0.5pF, 50V C0H ceramic
capacitors (0402)
Taiyo Yuden UMK105CH080DV
HPL, HPR,
SPKLP, SPKRP
4
Red multipurpose test points
C38, C58–C65,
C119, C120,
C132, C133
J1, J10
2
0
Not installed, ceramic capacitors
(0402)
USB mini-B right-angle PC-mount
receptacles
J2
1
C39
1
0.033FF Q10%, 25V X7R ceramic
capacitor (0603)
Murata GRM188R71E333K
3.5mm surface-mount stereo
headphone jack, 4 positions
J5
1
Digital audio optical transmitter
Toshiba TOTX147L
J6
1
2
18pF Q5%, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H180J
Digital audio optical receiver
Toshiba TORX147L
J12–J15
4
Red RCA jacks
JU12
1
4-pin, 3-way header
C30
C36, C41, C73,
C74
C48, C49
2 _______________________________________________________________________________________
MAX98088 Evaluation Kit
DESIGNATION
QTY
JU13, JU19
2
DESCRIPTION
12-pin (3 x 4) headers
DESIGNATION
QTY
SPKLN, SPKRN
2
Black multipurpose test points
DESCRIPTION
U1
1
Stereo audio codec (63 WLP)
Maxim MAX98088EWY+
1
1.8V low-noise linear regulator
(5 SC70)
Maxim MAX8510EXK18+
(Top Mark: AEA)
JU14–JU17,
JU22, JU27,
JU28, JU30,
JU32, JU34–
JU37, JU40,
JU41, JU42
16
JU20
1
6-pin (2 x 3) header
L1
1
47FH, 220mA inductor (1812)
Murata LQH43MN470J03L
U3
1
L2–L5
0
Not installed, inductors
(6.2mm x 6.3mm)
TOKO D63CB series (22FH)
1.8V low-noise linear regulator
(5 SOT23)
Maxim MAX8887EZK18+
(Top Mark: ADPX)
U4
1
Digital audio transceiver (28 SO)
Cirrus Logic CS8427-CSZ
U5
1
USB audio codec (32 QFP)
Texas Instruments PCM2707PJT
U7
1
UART-to-USB converter (32 QFN)
U8
1
Low-power microcontroller
(56 TQFN-EP*)
Maxim MAXQ2000-RBX+
U9, U16
2
3.3V low-noise linear regulators
(5 SC70)
Maxim MAX8511EXK33+
(Top Mark: AEI)
U10
1
93C46 type 3-wire EEPROM
16-bit architecture
(8 SO)
1
2.5V low-noise linear regulator
(5 SC70)
Maxim MAX8511EXK25+
(Top Mark: ADV)
1
Digital microphone (6 LGA)
Knowles Acoustic
SPM0423HE4H-WB
Akustica AKU2002C
(Top Mark: A2002C)
U13
0
Not installed, digital
microphone (6 LGA)
Knowles Acoustic
SPM0423HE4H-WB
Akustica AKU2002C
U14, U17
2
Dual SPDT switches (10 FDFN)
Maxim MAX4906ELB+
2-pin headers
U2
P101
1
-20V, -2.4A p-channel MOSFET
(Super SOT3)
Fairchild FDN304P
Q1
1
n-channel MOSFET (SOT23)
Central Semi 2N7002
R1, R7, R9–
R14, R31, R32,
R33, R56, R59,
R60, R61
15
R2, R15, R16,
R29
0
Not installed, resistors (0402)
R3
1
1MI Q5% resistor (0603)
R4, R28
2
10kI Q5% resistors (0603)
R5
1
10kI Q5% resistor (0402)
R6
1
1kI Q5% resistor (0603)
R17
1
402I Q1% resistor (0603)
R18
1
47kI Q5% resistor (0603)
0I Q5% resistors (0402)
R19, R20
2
220I Q5% resistors (0603)
R21, R22, R23
3
1.5kI Q5% resistors (0603)
R24, R25
2
27I Q5% resistors (0603)
R26
1
470I Q5% resistor (0603)
R27
1
2.2kI Q5% resistor (0603)
R34, R37
2
1.5kI Q5% resistors (0402)
R35, R36, R39,
R41, R42, R43
6
22I Q5% resistors (0402)
R38
1
1MI Q5% resistor (0402)
R50, R53
2
0I Q5% resistors (0603)
R54, R55, R57,
R58
4
2.2kI Q5% resistors (0402)
U11
U12
_______________________________________________________________________________________ 3
Evaluates: MAX98088
Component List (continued)
Evaluates: MAX98088
MAX98088 Evaluation Kit
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
Y2
1
13MHz crystal oscillator
(2.5mm x 2.0mm)
Y3
1
16MHz crystal
(3.2mm x 2.5mm)
Y4
1
12MHz crystal
(3.2mm x 2.5mm)
Y5
1
6MHz crystal (HC49)
Hong Kong X’tals
SSL60000N1HK188F0-0
DESIGNATION
QTY
DESCRIPTION
—
4
22FH, 1A inductor
(6.2mm x 6.3mm)
TOKO #A916C4-220M
—
2
USB high-speed A-to-mini-B
cables, 6ft
—
27
Shunts
—
1
PCB: MAX98088 EVALUATION
KIT+
*EP = Exposed pad.
Component Suppliers
SUPPLIER
Central Semiconductor Corp.
PHONE
WEBSITE
631-435-1110
www.centralsemi.com
www.fairchildsemi.com
Fairchild Semiconductor
888-522-5372
Hong Kong X'tals Ltd
852-35112388
www.hongkongcrystal.com
KEMET Corp.
864-963-6300
www.kemet.com
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Taiyo Yuden
800-348-2496
www.t-yuden.com
TDK Corp.
847-803-6100
www.component.tdk.com
TOKO America, Inc.
847-297-0070
www.tokoam.com
Note: Indicate that you are using the MAX98088 when contacting these component suppliers.
MAX98088 EV Kit Files
FILE
INSTALL.EXE
CDM20600.EXE
CDSM2.06.00WHQLCertified.ZIP
Device Manager
USB_Driver_Help_200.PDF
DESCRIPTION
Installs the EV kit files on your computer
USB driver installer
USB driver
Shortcut to device manager
USB driver installation help file
4 _______________________________________________________________________________________
MAX98088 Evaluation Kit
Required Equipment
• MAX98088 EV kit (USB cables included)
privileges are required to install the USB device
driver on Windows.
7)
Follow the directions of the Found New Hardware
window to install the USB device driver. Manually
specify the location of the device driver to be
C:\Program Files\MAX98088 (default installation
directory) using the Browse button. During device
driver installation, Windows may show a warning
message indicating that the device driver Maxim
uses does not contain a digital signature. This is
not an error condition and it is safe to proceed with
installation. Refer to the USB_Driver_Help_200.PDF
document included with the software for additional
information.
8)
Start the MAX98088 EV kit software by opening
its icon in the Start | Programs | Maxim EVKIT
Software menu. The EV kit software main window
appears, as shown in Figure 1.
9)
Wait while the software connects to the EV kit. Once
the connection is established, the status bar at the
bottom displays USB Connected and MAX98088
Connected.
• User-supplied Windows XP, Windows Vista, or
Windows 7 PC with two available USB ports
• 2.8V to 5.5V, 1A DC power supply
• Set of headphones with a 3.5mm plug
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system.
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to configure the EV kit for audio playback and control from the PC to verify the EV kit is functioning properly.
1)
Visit www.maxim-ic.com/evkitsoftware to download the latest version of the EV kit software,
98088Rxx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file.
2) Install the EV kit software on your computer by
running the INSTALL.EXE program inside the temporary folder. The program files are copied and
icons are created in the Windows Start | Programs
| Maxim EVKIT Software menu.
3)
Verify that all jumpers are in their default positions,
as shown in Table 1.
4)
Connect the power supply between the SPKVDD
and GND PCB pads.
5)
Set the power supply to 3.7V and turn it on.
6)
Connect a USB cable between the PC and J1 on
the EV kit. A New Hardware Found window pops
up when installing the USB driver for the first time.
If a window is not seen that is similar to the one
described above after 30s, remove the USB cable
from the board and reconnect it. Administrator
10) Once the EV kit software has initialized, select the
Block Diagram tab.
11) Click on the USB block.
12) Click Yes to automatically configure the EV kit for
USB audio playback.
13) Connect a USB cable between the PC and J10.
Windows automatically detects the EV kit has a
sound card and installs the USB audio class drivers. A USB DAC option is added to the list of available playback devices. All audio played through
this device is sent to the IC.
14) Connect headphones to the headphone jack (J2) to
hear audio generated by the PC.
_______________________________________________________________________________________ 5
Evaluates: MAX98088
Quick Start
Evaluates: MAX98088
MAX98088 Evaluation Kit
Detailed Description of Software
Graphical User Interface
The MAX98088 EV kit software uses a block diagram
interface to control all the functions of the MAX98088
audio codec. Click on blocks on the Block Diagram tab
(Figure 2) to control various functions of the IC. Each
block that represents multiple control options displays a
dialog box containing all available controls for that block.
Blocks that represent a single option toggle the enable
of that function when clicked. Blocks colored grey are
disabled while blocks colored blue are enabled. Click on
the MAX98088 Power button to enable/disable the IC.
The icon is shaded grey when the IC is in shutdown. The
icon is shaded blue when the IC is enabled.
Register Map Control Interface
To view the IC’s register settings, select the Control
Registers tab (Figure 3). The value of all control registers
is displayed and updated automatically when changes
are made using the graphical user interface (GUI). Click
on bit names or enter register values in hexadecimal format to manually program the IC’s registers. Changes to
the register map automatically update the GUI.
Figure 2. MAX98088 EV Kit Software Main Window (Block Diagram Tab)
6 _______________________________________________________________________________________
MAX98088 Evaluation Kit
Evaluates: MAX98088
Figure 3. MAX98088 EV Kit Software Main Window (Control Registers Tab)
_______________________________________________________________________________________ 7
Evaluates: MAX98088
MAX98088 Evaluation Kit
Global Control Buttons
Select Read All Registers to update the software settings with the register settings of the connected EV kit.
This option is useful if the EV kit software is restarted
without power cycling the EV kit.
Press Reset to restore the EV kit to power-on default settings. Uncheck options that need not be reset.
Select Write All Registers to download all software settings to the connected EV kit. This option is useful when
power has been removed from the IC. Pressing the Write
All Registers button is only necessary when the IC’s
entire register bank needs updating. Individual register
changes are made automatically.
Buttons at the top of the EV kit software window control
the connection and synchronization of the software with
the IC.
Press Connect to reconnect to the EV kit after the software is started. The Connect button is disabled when
the software is already connected to the EV kit. The
Connect button is used primarily if the EV kit is connected to the PC after the software is already running.
File Menu
The EV kit software can save its state to a configuration
file for loading at a later time. Select the Save Settings
menu item from the File menu bar to save the current
configuration. A Save As dialog box appears to allow the
location for the saved file to be selected. Files are saved
with the extension .ax26.
Select Load Settings to revert to a saved configuration.
An Open dialog box appears to allow the location of
the saved configuration file to be specified. The default
directory lists several presaved options. Alternatively,
.ax26 files are associated with the EV kit software.
Double click on a saved file to launch the EV kit software
and load the saved configuration.
Select Exit to exit the software.
Detailed Description of Hardware
The MAX98088 EV kit evaluates the MAX98088 audio
codec and provides access to all analog and digital
inputs/outputs on the device. In addition, the EV kit
includes support circuitry that eases evaluation of the
device.
Power Supplies
The EV kit requires a single 2.8V to 5.5V external supply
to operate. For evaluation other than power consumption, all other supplies are generated from USB bus
power. Jumpers JU14–JU17, and JU22 (see Table 1)
allow all supplies on the IC to be disconnected from USB
bus power and powered externally. This allows varying
the supply voltage and performing supply current measurements.
Class D Filters
View Menu
The IC integrates stereo Class D amplifiers. Although
these amplifiers are designed to operate completely filterless, filters are often helpful during evaluation. Stuffing
options for two types of filters are provided on the EV kit.
Options Menu
When long speaker cables are used with the IC, 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 a 680pF capacitor with the Murata
BLM18SG331TN1 ferrite bead generally works well.
The Show S/PDIF Transceiver Registers menu item
under the View menu bar displays a new tab sheet for
manually controlling the CS8427.
When the Auto Connect menu item is selected from the
Options menu bar, the software automatically connects
to the EV kit board as soon as the connection is available.
When Auto Read Status is selected, the software automatically reads the device registers every 1000ms.
The I2C Clock Speed submenu item selects the speed
of the I2C interface as either 400kHz or 100kHz.
Configure MCLK Routing selects which clock source is
connected to the IC.
Tools Menu
Select the Debug Tools menu item under the Tools
menu bar to directly send I2C commands to the EV kit.
To allow analysis of the audio output with an oscilloscope, or an analyzer not designed to accept Cass D
switching waveforms, populate L2–L5 with the included
22FH inductors and make connections to external equipment and speakers at FSPKLP, FSPKLN, FSPKRP, and
FSPKRN. The LC filter is designed to work best with an
8ω load. Do not connect the load at SPKLP, SPKLN,
SPKRP, and SPKRN when L2–L5 are installed.
Select Export Register Setup File to export the value of
all registers set to a nondefault setting.
8 _______________________________________________________________________________________
MAX98088 Evaluation Kit
When receiving S/PDIF data, the CS8427 outputs a
recovered master clock that is exactly 256 x fS, where
fS is the sample rate. This clock signal can be used to
clock the IC.
When transmitting S/PDIF data, the CS8427 requires a
master-clock input. If S/PDIF data is also being received,
the CS8427 uses this data to generate its own master
clock. If S/PDIF data is not being received, then the
CS8427 generates a master clock based on the LRCLK
signal being output by the IC. For proper transmit-only
operation, the IC must be configured in master mode.
USB Audio
The PCM2707 USB DAC generates I2S audio data from
a USB connection to the PC. The PCM2707 supports
standard class drivers that are included in most operat-
ing systems. As a result, no drivers are required for this
device. The PCM2707 appears as a sound card in the
PC and allows audio playback from the PC through the
IC. The PCM2707 also generates a master-clock signal
that can be used to clock the IC. The clock signal is 256
x fS.
Digital Microphone
The EV kit includes an on-board digital microphone
to demonstrate the digital microphone input. Install
shunts on jumpers JU27 and JU32 to enable the
microphone. When using the digital microphone, the
MIC1 analog microphone input cannot be used. If a
second digital microphone is added, then MIC2 is also
unavailable.
Jumper Selection
The EV kit includes 20 jumpers to adjust various hardware configuration options. Table 1 describes all the
jumpers available on the EV kit.
Table 1. Jumper Selection
JUMPER
SHUNT POSITION
DESCRIPTION
JU12
—
See Table 2
JU13
—
See Table 3
JU14
JU15
JU16
JU17
JU19
JU20
JU22
JU27
JU28
JU30
JU32
1-2*
Open
1-2*
Open
1-2*
Open
1-2*
Open
—
2-3*, 5-6*
Open
1-2*
Open
1-2
Open*
1-2*
Open
1-2
Open*
1-2
Open*
Connects 1.8V to DVDD
Allows external powering of DVDD
Connects 1.8V to AVDD
Allows external powering of AVDD
Connects 1.8V to HPVDD
Allows external powering of HPVDD
Connects 3.3V to DVDDS1
Allows external powering of DVDDS1
See Table 3
Connects the on-board I2C master to the IC
Allows external control of the IC over I2C
Connects 3.3V to DVDDS2
Allows external powering of DVDDS2
Connects the digital microphone data output to the IC
Disconnects the digital microphone data output from the IC
Connects the MAX98088 interrupt output (IRQ) to the on-board microcontroller
Disconnects the MAX98088 interrupt output (IRQ) to the on-board microcontroller
Connects JACKSNS to MIC1 for jack detection
Disconnects JACKSNS from MIC1
Connects the digital microphone clock input to the IC
Disconnects the digital microphone clock input from the IC
_______________________________________________________________________________________ 9
Evaluates: MAX98088
S/PDIF Transceiver
The CS8427 S/PDIF transceiver serves as a format converter between I2S and S/PDIF. Use this device to send
and receive digital audio over the optical connectors
(J5, J6).
Evaluates: MAX98088
MAX98088 Evaluation Kit
Table 1. Jumper Selection (continued)
JUMPER
SHUNT POSITION
1-2
JU34
Connects a 2.2kI resistor from MIC1N to ground for microphone biasing
Open*
Disconnects MIC1N from ground
1-2
JU35
Connects a 2.2kI resistor from MIC2N to ground for microphone biasing
Open*
Disconnects MIC2N from ground
1-2
JU36
Grounds MIC1N for single-ended operation on MIC1
Open*
Enables differential operation on MIC1
1-2
JU37
Grounds MIC2N for single-ended operation on MIC2
Open*
Enables differential operation on MIC2
1-2
JU40
Connects MIC1P to MICBIAS through a 2.2kI resistor
Open*
Disconnects MIC1P from MICBIAS
1-2
JU41
Connects MIC2P to MICBIAS through a 2.2kI resistor
Open*
Disconnects MIC2P from MICBIAS
Allows software to sense that a voltage is applied to SPKVDD (through SPKVDD_
POWERED net driving the MAXQ2000)
1-2*
JU42
DESCRIPTION
Open
Disconnects Q1 for accurate SPKVDD supply current measurement
*Default position.
Master Clock Selection
Jumper JU12 selects which master-clock source clocks
the IC. The available clocks are shown in Table 2. The
EV kit software indicates the correct clock source to use
depending on which audio source is in use. If an external
audio source is used, choose either the on-board 13MHz
oscillator or an external clock. To connect the external
clock, remove the shunt from JU12 and connect the
clock to the center pin.
Digital Audio Interface
Jumpers JU13 and JU19 provide access to the digital
audio interfaces on the IC. See Table 3 for individual pin
descriptions. When using the on-board USB and S/PDIF
audio sources, install shunts between pins 2-3 on each
row. When using an external audio source, remove the
shunts and connect the audio source clock and data
lines to position 2 of the header. Position 1 on each row
provides a convenient ground connection.
Control Interface
Jumper JU20 connects the on-board I2C master to the
IC. When using an external I2C master, remove both
shunts from JU20 and connect position 1 to SDA and
SCL on the external I2C master. Install pullup resistors
at R15 and R16 if the external master does not include
pullup resistors.
Microphone Bias and Jack Sense
Jumpers JU34–JU37, JU40, and JU41 provide microphone biasing on MIC1 and MIC2. To provide microphone bias, install a shunt on JU40 and JU41. For singleended microphone inputs, install shunts on JU36 and
JU37. For differential microphone inputs, install shunts
on JU34 and JU35.
To enable microphone detection on MIC1, install a shunt
on JU30.
Table 2. MAX98088 Clock Sources (JU12)
SHUNT POSITION
CLOCK SOURCE
1-2
Disabled
1-3
13MHz oscillator
1-4*
Software-selected clock source
*Default position.
10 �������������������������������������������������������������������������������������
MAX98088 Evaluation Kit
JUMPER
JU13
JU19
POSITION 1
POSITION 2
POSITION 3
GND
BCLKS1 (IC)
BCLK (S/PDIF)
GND
LRCLKS1 (IC)
LRCLK (S/PDIF)
GND
SDINS1 (IC)
DAC input (S/PDIF)
GND
SDOUTS1 (IC)
ADC output (S/PDIF)
GND
BCLKS2 (IC)
BCLK (USB audio)
GND
LRCLKS2 (IC)
LRCLK (USB audio)
GND
SDINS2 (IC)
DAC input (USB audio)
GND
SDOUTS2 (IC)
ADC output (USB audio)
Note: Default shunt position is between pins 2-3 for all rows.
______________________________________________________________________________________ 11
Evaluates: MAX98088
Table 3. Digital Audio Interface (JU13, JU19)
Evaluates: MAX98088
MAX98088 Evaluation Kit
Figure 4a. MAX98088 EV Kit Schematic (Sheet 1 of 5)
12 �������������������������������������������������������������������������������������
MAX98088 Evaluation Kit
Evaluates: MAX98088
Figure 4b. MAX98088 EV Kit Schematic (Sheet 2 of 5)
______________________________________________________________________________________ 13
Evaluates: MAX98088
MAX98088 Evaluation Kit
Figure 4c. MAX98088 EV Kit Schematic (Sheet 3 of 5)
14 �������������������������������������������������������������������������������������
MAX98088 Evaluation Kit
Evaluates: MAX98088
Figure 4d. MAX98088 EV Kit Schematic (Sheet 4 of 5)
______________________________________________________________________________________ 15
Evaluates: MAX98088
MAX98088 Evaluation Kit
Figure 4e. MAX98088 EV Kit Schematic (Sheet 5 of 5)
16 �������������������������������������������������������������������������������������
MAX98088 Evaluation Kit
Evaluates: MAX98088
1.0’’
Figure 5. MAX98088 EV Kit Component Placement Guide—Component Side
______________________________________________________________________________________ 17
Evaluates: MAX98088
MAX98088 Evaluation Kit
1.0’’
Figure 6. MAX98088 EV Kit PCB Layout—Component Side
18 �������������������������������������������������������������������������������������
MAX98088 Evaluation Kit
Evaluates: MAX98088
1.0’’
Figure 7. MAX98088 EV Kit PCB Layout—Ground Layer 2
______________________________________________________________________________________ 19
Evaluates: MAX98088
MAX98088 Evaluation Kit
1.0’’
Figure 8. MAX98088 EV Kit PCB Layout—Ground Layer 3
20 �������������������������������������������������������������������������������������
MAX98088 Evaluation Kit
Evaluates: MAX98088
1.0’’
Figure 9. MAX98088 EV Kit PCB Layout—Power Layer 4
______________________________________________________________________________________ 21
Evaluates: MAX98088
MAX98088 Evaluation Kit
1.0’’
Figure 10. MAX98088 EV Kit PCB Layout—Ground Layer 5
22 �������������������������������������������������������������������������������������
MAX98088 Evaluation Kit
Evaluates: MAX98088
1.0’’
Figure 11. MAX98088 EV Kit PCB Layout—Solder Side
______________________________________________________________________________________ 23
Evaluates: MAX98088
MAX98088 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION_
DATE
0
8/10
Initial release
—
1
5/11
Added an alternate source for U12 and U13 components
3
DESCRIPTION
PAGES_
CHANGED
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.
24 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011
Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
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