MAX9768EVKIT+ [MAXIM]
Fully Tested PCB;
| 型号： | MAX9768EVKIT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Fully Tested PCB PC |
| 文件： | 总9页 (文件大小：206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1222; Rev 0; 11/07
MAX9768 Evaluation Kit/Evaluation System
Evluate:MAX9768
General Description
Features
♦ Fully Tested PCB
The MAX9768 evaluation kit (EV kit) is a fully assembled
and tested printed-circuit board (PCB) that demon-
strates the capabilities of the MAX9768 mono 10W
Class D speaker amplifier with volume control. The
MAX9768 EV kit also includes Windows® 98SE/2000/XP-
compatible software that provides a simple graphical user
interface (GUI) for exercising the features of the MAX9768.
♦ 10W Output into 8Ω Load at 13V Power Supply
♦ Bridge-Tied Load (BTL) Output and Click-and-Pop
Suppression
♦ Dual Mode™ Volume Control: Analog or I2C
♦ Dual Modulation Schemes: Fixed Frequency and
Spread Spectrum
The MAX9768 evaluation system (EV system) consists of the
MAX9768 EV kit and a companion CMAXQUSB serial-
interface board. The CMAXQUSB interface board allows
a PC to control an I2C interface using its USB port. Order
the MAX9768 EV system (MAX9768EVCMAXQU+) for a
complete PC-based evaluation of the MAX9768. Order
the MAX9768 EV kit (MAX9768EVKIT+) if you already
have a MAX9768-compatible serial interface.
♦ Shut-Down Mode and Speaker Mute Mode
♦ On-Board LDO for Low-Voltage Analog Power
Supply
♦ Windows 98SE/2000/XP-Compatible Evaluation
Software
♦ EV System Includes USB Connectivity
Ordering Information
Windows is a registered trademark of Microsoft Corp.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
PART
TYPE
EV Kit
Component Lists
MAX9768 EV System
MAX9768EVKIT+
MAX9768EVCMAXQU+
+Denotes lead-free and RoHS-compliant.
EV System
PART
MAX9768EVKIT+
CMAXQUSB+
QTY
DESCRIPTION
MAX9768 EV kit
1
1
Note: The MAX9768 EV kit software is designed for use with
the complete EV system. The EV system includes both the
Maxim CMAXQUSB interface board and the EV kit. If the
Windows software will not be used, the EV kit board can be
purchased without the Maxim CMAXQUSB board.
Serial-interface board
MAX9768 EV Kit
DESIGNATION QTY
DESCRIPTION
MAX9768 EV Kit (continued)
MINIMAL COMPONENTS FOR CUSTOMER DESIGN
DESIGNATION QTY
DESCRIPTION
0.1µF 10ꢀ, 16V X7R ceramic
C1, C2
C3, C5
C4
2
2
1
2
capacitors (0603)
Murata GRM188R71C104K
OPTIONAL COMPONENTS FOR CUSTOMER EVALUATION
Not installed, ceramic capacitors
(0603)
C9, C10
0
1µF 10ꢀ, 10V X7R ceramic
capacitors (0603)
Murata GRM188R61A105K
0.47µF 10ꢀ, 16V X7R ceramic
capacitor (0805)
0.01µF 10ꢀ, 50V X7R ceramic
capacitors (0805)
C11, C12
2
Murata GRM216R71H103K
0.22µF 10ꢀ, 25V X7R ceramic
capacitors (1206)
Panasonic ECJ-3VB1E224K
Murata GRM21BR71C474K
C13, C15
C14, C16, C20
C17
2
3
1
1
1µF 10ꢀ, 16V X7R ceramic
capacitors (0805)
Murata GRM21BR71C105K
C6, C8
0.01µF 10ꢀ, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C103K
22µF 20ꢀ, 16V aluminum
electrolytic capacitor (C case)
Panasonic EEEFC1C220R
C7, C21
R2, R3
2
2
1µF 10ꢀ, 16V X7R ceramic
capacitor (0805)
Murata GRM21BR71C105K
20kΩ 1ꢀ resistors (0603)
Maxim 10W mono speaker amplifier
with volume control
MAX9768ETG+ (24-pin, 4mm x 4mm
x 0.8mm, TQFN-EP*)
1µF 10ꢀ, 10V X7R ceramic
capacitor (0603)
U1
1
C18
Murata GRM188R61A105K
*EP = Exposed paddle.
________________________________________________________________ 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.
MAX9768 Evaluation Kit/Evaluation System
Component Lists (continued)
MAX9768 EV Kit (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
100pF 5ꢀ, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
Maxim 12V low-dropout linear regulator
MAX1726EUK33+ (5-pin SOT23)
U2
—
—
1
8
4
C19
1
Shunts
J1
J2
1
1
4
5
1
2
2 x 10 right-angle female receptacle
White RCA mono jack
Binding posts, uninsulated
Single-row 3-pin headers
3-way-pin header
0.250in x 0.500in 4–40 round nylon
spacers
J3–J6
JU1–JU5
JU6
—
—
4
1
4–40 x 0.375in nylon machine screws
PCB: MAX9768 Evaluation Kit+
JU7, JU8
2-pin headers
MAX9768 EV Kit Files
60
Murata BLM21PG600SN1
Shorted with 0 resistors (0603)
Ω, 3A ferrite beads (0805)
L1, L2
L3, L4
L5, L6
2
2
2
FILE
DESCRIPTION
Installs the EV kit files
on your computer
Ω
INSTALL.EXE
Evluate:MAX9768
22µH, 1.9A inductors
TDK SLF10145T-220M1R9PF
MAX9768.EXE
FTD2XX.INF
Application program
USB device driver file
R1, R5
R4
2
1
10k
Ω
5ꢀ resistors (0603)
5ꢀ resistor (1206)
20ꢀ thumbwheel
Uninstalls the EV kit
software
20Ω
UNINST.INI
10kΩ
USB driver installation
help file
R6
1
potentiometer
Panasonic EVL-HFAA05B14
TROUBLESHOOTING_USB.PDF
directly from the EV kit software. Text in bold and
underlined refers to items from the Windows 98SE/
2000/XP operating system.
Quick Start
Recommended Equipment
Before proceeding, the following equipment is needed:
Procedure for Stand-Alone Operation
The MAX9768 EV kit is fully assembled and tested.
Follow the steps below to verify board operation for
analog volume control. Do not turn on the power sup-
ply until all connections are completed.
•
•
•
•
4.5V to 14V DC, 3A power supply
Audio source (i.e., CD player, 1V
8Ω speaker
maximum output)
RMS
MAX9768 EV system
1) On the MAX9768 EV kit, make sure the shunts are in
the default positions (see Table 1).
MAX9768 EV kit
Maxim CMAXQUSB interface board
(USB cable included)
2) Connect the positive terminal of the 4.5V to 14V DC
power supply to the PV binding post, and the power-
DD
•
A user-supplied Windows 98SE/2000/XP PC with a
spare USB port
supply ground terminal to the PGND binding post.
3) Connect the 8Ω speaker across the FOUT+ and
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
FOUT- binding posts.
Component Suppliers
SUPPLIER
PHONE
770-436-1300
WEBSITE
Murata Mfg. Co., Ltd.
Panasonic Corp.
TDK Corp.
www.murata.com
800-344-2112
847-803-6100
www.panasonic.com
www.component.tdk.com
Note: Indicate that you are using the MAX9768 when contacting these component suppliers.
2
_______________________________________________________________________________________
MAX9768 Evaluation Kit/Evaluation System
Evluate:MAX9768
4) Plug the audio source to the RCA jack.
Table 1. MAX9768 EV Kit Jumper Settings
5) Turn on the audio source.
JUMPER SHUNT POSITION
DESCRIPTION
Normal operation
6) Turn on the 4.5V to 14V DC power supply.
2-3*
JU1
1-2
7) Adjust the potentiometer R6 to change the speaker
volume.
Speaker mute
1-2*
Normal operation
Amplifier shutdown
JU2
2-3
Procedure for I2C Interface
Volume Control
The MAX9768 EV kit is fully assembled and tested.
Follow the steps below to verify board operation for I2C
volume control. Caution: Do not turn on the power
supply until all connections are completed.
I2C Address: disabled, stand-
alone operation
2-3*
1-2
I2C Address: 1001 011x
I2C Address: 1001 001x
I2C Address: 1001 010x
Stand-alone operation
I2C volume control mode
SYNC connected to GND
JU3, JU4
1-2, 2-3
2-3, 1-2
1) Visit www.maxim-ic.com/evkitsoftware to download
the latest version of the EV kit software,
9768Rxx.ZIP.
2-3*
JU5
1-2
2) Install the MAX9768 evaluation software on your
computer by running the INSTALL.EXE program.
The program files are copied and icons are created
in the Windows Start menu.
1-4*
1-2
SYNC connected to V
SYNC unconnected
DD
JU6
JU7
1-3
SYNC connected to external
clock
3) On the CMAXQUSB board, ensure that the shunt of
JU1 is in the 3.3V position.
Open
V
supplied by on-board
DD
4) Carefully connect the boards by aligning the
MAX9768 EV kit’s 20-pin connector with the 20-pin
connector of the CMAXQUSB board.
1-2*
Open
1-2*
LDO regulator
V
supplied by an external
DD
power supply
5) Ensure shunts on JU1, JU2, JU4, JU6, and JU7 are
in their default positions (see Table 1).
In stand-alone operation:
classic PWM modulation
6) Place the shunt on JU3 across pins 1-2.
7) Place the shunt on JU5 across pins 1-2.
8) Remove the shunt on JU8.
JU8
In stand-alone operation:
filterless modulation
I2C interface control mode
Open
Open
9) Connect the positive terminal of the 4.5V to 14V DC
*Default position.
power supply to the PV
binding post, and the
DD
power-supply ground terminal to the PGND binding
post.
the TROUBLESHOOTING_USB.PDF document
included with the software if you have any prob-
lems during this step.
10) Connect the 8Ω speaker across the FOUT+ and
FOUT- binding posts.
15) Follow the directions of the Add New Hardware
Wizard to install the USB device driver. Choose the
Search for the Best Driver for your Device option.
Specify the location of the device driver to be
C:\Program Files\MAX9768 (or the directory cho-
sen during installation) using the Browse button.
11) Plug the audio source to the RCA jack.
12) Turn on the audio source.
13) Turn on the 4.5V to 14V DC power supply.
14) Connect the USB cable from the PC to the
CMAXQUSB board. A Building Driver Database
window pops up in addition to a New Hardware
Found message. If you do not see a window that is
similar to the one described above after 30s, remove
the USB cable from the CMAXQUSB and reconnect
it. Administrator privileges are required to install the
USB device driver on Windows 2000/XP. Refer to
16) Start the MAX9768 EV kit software by opening its
icon in the Start menu. The GUI main window
appears, as shown in Figure 1.
17) Move the volume-control slider on the software win-
dow and verify that the speaker volume changes.
_______________________________________________________________________________________
3
MAX9768 Evaluation Kit/Evaluation System
Volume Control
Detailed Description of Hardware
Jumpers JU3, JU4, JU5, and JU8 select which volume-
control mode is used. See Table 3 for details.
The MAX9768 is a mono, switch-mode (Class D) audio
power amplifier. The EV kit is designed to be driven by
the lineout or headphone jack of a CD player, or direct-
ly connected to any audio source. A thumbwheel
potentiometer mounted on-board is provided to control
the volume. The volume can also be controlled by the
I2C interface.
Table 3. Control-Mode Setting
JUMPER SHUNT POSITION
DESCRIPTION
I2C Address: disabled, stand-
alone operation
2-3*
The EV kit has an on-board LDO (MAX1726) to power
the input buffers and the volume-control circuitry.
1-2
I2C Address: 1001 011x
I2C Address: 1001 001x
I2C Address: 1001 010x
Stand-alone operation
I2C volume control mode
JU3, JU4
1-2, 2-3
2-3, 1-2
Preamplifier Gain Configuration
The preamplifier gain stage of the MAX9768 EV kit is
configured to 0dB. To avoid clipping at the amplifier
2-3*
JU5
1-2
input stage, ensure input signals are ≤ 1V
. If input
RMS
signals are ≥ 1V
, attenuate the input signal at the
In stand-alone operation:
classic PWM modulation
RMS
1-2*
preamplifier gain stage to avoid clipping at the pream-
plifier output. The preamplifier gain stage is defined as:
JU8
In stand-alone operation:
filterless modulation
I2C interface control mode
Open
Evluate:MAX9768
A
= -R3 / R2
V (preamplifier)
Open
where R2 is in the 10kΩ to 40kΩ range.
*Default position.
Define the preamplifier gain such that the output of the
Shutdown Mode
Jumper JU2 sets the amplifier in normal operation or
shutdown mode. See Table 4 for details.
preamplifier is ≤ 1V
(i.e., V x A
≤
RMS
IN
V (preamplifier)
1V
). Once the preamplifier gain is fixed, use the
RMS
amplifier’s volume-control block to set the clipping lev-
els at the output of the Class D amplifier.
Table 4. JU2 Setting
JUMPER SHUNT POSITION
Power Supplies
DD
The power supply is applied on PV and PGND binding
DESCRIPTION
Normal operation
Shutdown mode
posts. V is generated either by the on-board MAX1726
DD
1-2*
or by an external 3.3V power supply applied between the
JU2
2-3
V
DD
pad and PGND. See Table 2 for JU7 setting.
*Default position.
Table 2. JU7 Jumper Setting
Mute Control
JUMPER SHUNT POSITION
DESCRIPTION
Jumper JU1 controls the MUTE pin state. See Table 5
for details.
On-board V
MAX1726
generated by
DD
1-2*
JU7
Table 5. JU1 Setting
JUMPER SHUNT POSITION
User-provided 3.3V V
power supply
DD
Open
DESCRIPTION
Normal operation
Speaker muted
2-3*
*Default position.
JU1
1-2
*Default position.
4
_______________________________________________________________________________________
MAX9768 Evaluation Kit/Evaluation System
Evluate:MAX9768
Modulation Schemes
Detailed Description of Software
Jumper JU6 sets the output modulation scheme. See
To start the MAX9768 EV kit software, double-click the
Table 6 for details.
MAX9768 EV kit icon created during installation. The
GUI main window appears, as shown in Figure 1. Wait
approximately 2s while the MAX9768 EV kit software
connects to the CMAXQUSB board and automatically
detects the I2C address of the device.
Table 6. JU6 Setting
JUMPER SHUNT POSITION
DESCRIPTION
Fixed-frequency mode with
1-4*
1-2
On the left side of the window, the scrollbar is used to
increment/decrement the speaker volume by one step.
f
= 300kHz
SW
Spread-spectrum mode with
f = 300kHz 7.5kHz
S
On the right side of the window, a user can manually
change the device I2C address, set volume directly by
programming the volume register, and set the modula-
tion mode.
JU6
Fixed-frequency mode with
f = 360kHz
S
1-3
Fixed-frequency mode with
Open
f = 1/4 external clock
S
frequency
*Default position.
Figure 1. MAX9768 Evaluation Software Main Window
_______________________________________________________________________________________
5
MAX9768 Evaluation Kit/Evaluation System
Evluate:MAX9768
Figure 2. MAX9768 EV Kit Schematic
6
_______________________________________________________________________________________
MAX9768 Evaluation Kit/Evaluation System
Evluate:MAX9768
Figure 3. MAX9768 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
7
MAX9768 Evaluation Kit/Evaluation System
Evluate:MAX9768
Figure 4. MAX9768 EV Kit PCB Layout—Component Side
8
_______________________________________________________________________________________
MAX9768 Evaluation Kit/Evaluation System
Evluate:MAX9768
Figure 5. MAX9768 EV Kit PCB Layout—Solder Side
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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