_______________________________________________________________ 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.
MAX97001 Evaluation Kit
Evaluates: MAX97001
General Description
The MAX97001 evaluation kit (EV kit) is a fully assembled
and tested PCB that evaluates the MAX97001 mono
Class D audio power amplifier and stereo Class H
DirectDriveM headphone amplifier communicating over
a 2-wire I2C interface. The EV kit features an on-board
microcontroller for communicating with the I2C interface
of the MAX97001. PCB pads are provided for accessing
the analog inputs and amplifier outputs.
The MAX97001 EV kit requires a 2.7V to 5.5V supply for
PVDD and a 1.8V supply for VDD.
WindowsM 2000-, Windows XPM-, and Windows VistaM-
compatible software is provided to facilitate configura-
tion. The software controls an on-board microcontroller
over USB, which generates I2C commands.
Features
S Proven Audio PCB Layout
S On-Board USB Interface Circuit Generates I2C-
Compatible Signals
S PCB Pads for User-Supplied I2C-Compatible
Signals
S Surface-Mount Components
S Windows 2000-, Windows XP-, and Windows Vista
(32-Bit)-Compatible Software
S Fully Assembled and Tested
Ordering Information
Component List
19-5082; Rev 0; 12/09
+Denotes lead(Pb)-free and RoHS compliant.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
DESIGNATION QTY DESCRIPTION
C1, C3–C10, C17 10
0.1FF Q10%,16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
C2 1
4.7FF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
C11, C12 2
10pF Q5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J
C13, C15, C32,
C34 4
10FF Q10%, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J106M
C14, C16, C22–
C25, C35–C38 10
1FF Q10%, 10V X5R ceramic
capacitors (0402)
Murata GRM155R61A105K
C18, C19 2
22pF Q5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J
C20 1
3300pF Q10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H332K
DESIGNATION QTY DESCRIPTION
C26–C29,
C39–C42 0Not installed, ceramic capacitors
(0402)
C31, C33 2
0.1FF Q10%, 16V X7R ceramic
capacitors (0402)
Murata GRM155R71C104K
C43–C47 50.22FF Q10%, 10V X5R ceramic
capacitors (0402)
Murata GRM155R61A224K
D1 1 Green LED (0603)
GND 1 Black miniature test point
HPJK 1 3.5mm stereo phone jack, SMT
(3 positions, nonswitch)
HPL 1 White miniature test point
HPR 1 Red miniature test point
JINA1, JINB1 2 White RCA jacks (left)
JINA2, JINB2 2 Red RCA jacks (right)
JU1, JU2 2 2-pin headers
L1, L2 0
Not installed, inductors (provided
with EV kit)
TOKO A916CY-220M
OUT-, OUT+ 2 1-pin headers
PART TYPE
MAX97001EVKIT+ EV Kit
MAX97001 Evaluation Kit
Evaluates: MAX97001
2 ______________________________________________________________________________________
Component List (continued)
Component Suppliers
Note: Indicate that you are using the MAX97001 when contacting these component suppliers.
*EP = Exposed pad.
SUPPLIER PHONE WEBSITE
Hong Kong X’tals Ltd. 852-35112388 www.hongkongcrystal.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
TOKO America, Inc. 847-297-0070 www.tokoam.com
DESIGNATION QTY DESCRIPTION
P1 1 USB mini type-B receptacle con-
nector
R1, R10–R13,
R18, R19 70I Q5% resistors (0402)
R2 1 220I Q5% resistor (0603)
R3 1 10kI Q5% resistor (0603)
R4 1 2.2kI Q5% resistor (0603)
R5, R8, R9 3 1.5kI Q5% resistors (0603)
R6, R7 2 27I Q5% resistors (0603)
R14, R15 2 10I Q1% resistors (0402)
R16, R17 0 Not installed, resistors (0603)
R20, R21 2 0I Q5% resistors (0603)
R22, R23 2 22I Q5% resistors (0402)
TP1, TP2 0 Not installed, multipurpose test
points
U1 1
Mono Class H speaker and
DirectDrive headphone amplifier
(20 WLP)
Maxim MAX97001EWP+
U2 1
32-bit microcontroller
(68 QFN-EP*)
Maxim MAXQ2000-RAX+
DESIGNATION QTY DESCRIPTION
U3 1 93C46 type 3-wire EEPROM
(8 SO)
U4 1 UART-to-USB converter (32 TQFP)
U5 1
3.3V regulator (5 SC70)
Maxim MAX8511EXK33+
(Top Mark: AEI)
U6 1
2.5V regulator (5 SC70)
Maxim MAX8511EXK25+
(Top Mark: ADV)
Y1 1
16MHz crystal (HCM49)
Hong Kong X'tals
SSM16000N1HK188F0-0
Y2 1
6MHz crystal (HCM49)
Hong Kong X'tals
SSL60000N1HK188F0-0
— 1 USB high-speed A-to-mini B
cable, 2m
— 2 Shunts
— 1 PCB: MAX97001 EVALUATION
KIT+
MAX97001 Evaluation Kit
Evaluates: MAX97001
_______________________________________________________________________________________ 3
Quick Start
Required Equipment
• 5V, 1A DC power supply (PVDD)
• 1.8V, 100mA DC power supply (VDD)
• Speaker
• Headphones
• User-supplied Windows 2000, Windows XP, or
Windows Vista PC with a spare USB port
• MAX97001 EV kit (cable included)
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 under-
lined refers to items from the Windows operating system
Procedure
The MAX97001 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Visit www.maxim-ic.com/evkitsoftware to down-
load the latest version of the EV kit software,
MAX97000_1_2xx.ZIP. Save the EV kit software to a
temporary folder and uncompress the ZIP file.
2) Install the EV kit software on the computer by run-
ning the INSTALL.EXE program inside the temporary
folder.
3) Verify that shunts are installed on jumpers JU1 and
JU2. This configures the I2C inputs to receive signals
from the USB interface circuitry.
4) Verify that a shunt is installed on jumper JU3.
5) Connect the USB cable from the PC to the EV kit
board. 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 privi-
leges are required to install the USB device driver
on Windows.
6) 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\MAX97000_1_2 (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.PDF
document included with the software for additional
information.
7) Connect the 5V power supply across the PVDD and
GND pads.
8) Connect the 1.8V power supply across the VDD and
GND pads.
9) Connect the speaker across the OUT+ and OUT-
test points.
10) Connect the headphones to HPJK.
11) Enable the power supplies.
12) Start the MAX97001 EV kit software by selecting its
icon in the Start | Programs menu.
13) Observe as the program automatically detects the
address of the MAX97001 and starts the main program.
14) The MAX97001 is now ready for evaluation.
MAX97001 EV Kit Files
FILE DESCRIPTION
INSTALL.EXE Installs the EV kit files on your
computer
MAX97000_1_2.EXE Application program
FTD2XX.INF USB device driver file
UNINST.INI Uninstalls the EV kit software
USB_Driver_Help.PDF USB driver installation help file
MAX97001 Evaluation Kit
Evaluates: MAX97001
4 ______________________________________________________________________________________
Detailed Description of Software
Note: Text in bold refers to items in the EV kit software.
Graphical User Interface (GUI)
The MAX97001 EV kit software GUI (Figures 1 and 2)
provides a convenient way to test the features of the
MAX97001. Figure 1 displays the MAX97001 EV kit soft-
ware’s Main Control tab sheet, while Figure 2 displays
the Registers tab sheet. Actions on the two tabs gener-
ate I2C commands to update the MAX97001 internal
memory registers.
The MAX97001 EV kit software Main Control tab sheet
(Figure 1) divides the EV kit functions into logical blocks.
The MAX97001 EV kit software Registers tab (Figure 2)
displays each register’s individual bit logic-level status.
A data bit in bold indicates a logic-high, while a non-
bolded data bit indicates a logic-low. Clicking on the
individual data bit toggles the bit and performs a write
command. The new command is shown in the 0x edit
box at the far right. Write commands can be written to
the registers alternatively by typing a hex value in the
edit box and pressing Enter on the keyboard.
Figure 1. MAX97001 Evaluation Kit Software (Main Control Tab)
MAX97001 Evaluation Kit
Evaluates: MAX97001
_______________________________________________________________________________________ 5
Figure 2. MAX97001 Evaluation Kit Software (Registers Tab)
MAX97001 Evaluation Kit
Evaluates: MAX97001
6 ______________________________________________________________________________________
Software Startup
Upon starting the program, the MAX97001 EV kit soft-
ware automatically searches for the USB interface cir-
cuit and then for the MAX97001 device address. The
MAX97001 EV kit enters the normal operating mode
when the USB connection is detected and has found the
device address. If the USB connection is not detected,
the software prompts the user to retry or enter the demo
mode.
Demo Mode
The MAX97001 EV kit software enters the demo mode
when the USB connection is not detected, or by select-
ing the Options | Demo Mode menu item in the main
window. When in demo mode, all software communica-
tion to the EV kit circuit is disabled; however, most of the
software GUI is functional. Demo mode allows the user
to evaluate the software without hardware connectivity.
If the USB cable is connected to the EV kit, but power
is not applied to PVDD, the EV kit GUI acts like it is in
demo mode. In such a case, the EV kit is connected to
the PC through USB and I2C commands can be sent to
the MAX97001. However, without power, the MAX97001
does not acknowledge the I2C commands. When power
is applied, press the Reset button to detect the pres-
ence of the MAX97001.
Write All/Read All/Reset
The Write All button writes the current settings to all the
registers on the GUI. The EV kit software GUI performs
I2C write commands as changes occur on the GUI. The
Read All button changes the GUI settings to match
the MAX97001 register settings. To change settings
one time, enter demo mode by selecting the Options |
Demo Mode menu item, change the GUI to the required
settings, exit demo mode by selecting Options | Demo
Mode, and then press the Write All button. If further
changes are not required, enter demo mode to dis-
able communication to the MAX97001. To obtain the
MAX97001 settings, exit demo mode and press the
Read All button. The Reset button clears the EV kit soft-
ware GUI and reprograms the MAX97001 to the default
values.
MAX97001 Master Controls
The EV kit software’s MAX97001 Master Controls group
box contains ENABLE, Volume Slew Disable, and Zero
Crossing Detection Disable checkboxes. The ENABLE
checkbox, which is also called the software shutdown,
enables or disables the MAX97001. The Volume Slew
Disable checkbox, when checked, disables the volume
slewing. The Zero Crossing Detection Disable check-
box disables the zero-crossing detection (ZCD) during a
volume change operation when checked. When enabled
(unchecked), the ZCD forces all volume adjustment to
be made when the output signal is crossing zero, thus
reducing audio clicks during volume changes.
Input Gain
The MAX97001 EV kit software’s Input Gain group
box selects the input channel preamp gain for the
MAX97001. The MAX97001 input channel preamp gain
is selectable between -6dB, -3dB, 0dB, +3dB, +6dB,
+9dB, and +18dB.
Charge Pump
The MAX97001 features an internal charge pump for
Maxim’s Class H DirectDrive architecture. The charge
pump operates in two modes, fixed mode and high-effi-
ciency mode. By default, the MAX97001 charge pump
operates in high-efficiency mode. High-efficiency mode
on the charge pump dynamically changes the internal
supply rails. To have fixed internal supply rails, check the
Fixed Mode checkbox in the Charge Pump group box.
Within fixed mode, there are two options for the supply
rails shown in the drop-down list, Q1.8V and Q0.9V.
Distortion Limiter
The distortion limiter limits distortion based on the
defined THD level and has programmable release time.
Switch Enable
The MAX97001 features an internal switch that can
bypass the Class D amplifier and allow an external
amplifier to power the same speaker connected to the
MAX97001 EV kit without requiring external switches.
Connect the external amplifier output to COM1 and
COM2, and enable in the software by checking the
Switch Closed checkbox in the Analog Switch group
box.
Low-Power Mode
The MAX97001’s low-power mode minimizes current
consumption when only using the headphone amplifier.
Low-power mode transmits a single-ended audio signal
to the headphone amplifier from either INA or INB, or a
differential signal from INA and INB. Low-power mode
can be enabled by clicking on the LP Mode drop-down
list. The volume control and mixer are bypassed in this
mode.
Mixer
The speaker, left headphone, and right headphone
each have an independent mixer. The MAX97001 EV kit
accepts a pair of single-ended audio inputs for stereo
MAX97001 Evaluation Kit
Evaluates: MAX97001
_______________________________________________________________________________________ 7
operation, or a pair of differential audio inputs for mono
operation. The single-ended input signals for the speak-
er and headphones are defined as IN_1 (left) and IN_2
(right). In the Input Configuration group box, select
Stereo (S/E) for single-ended stereo operation or Mono
(DIF) for differential mono operation. Depending on the
selection, the speaker and headphone mixers provide
options for selecting the audio source for the SPKR
Mixer, Left HP Mixer, and Right HP Mixer.
Speaker Amplifier
The MAX97001 EV kit software’s Speaker Amplifier
group box contains the speaker mixer, speaker volume,
and speaker-enable control. Check the Speaker Enable
checkbox to enable the speaker amplifier. The Speaker
Volume track bar sets the speaker volume between
-30dB (min) to +20dB (max). Alternatively, the user can
enter a numerical value inside the Speaker Volume edit box.
Headphone Amplifier
The Headphone Amplifier group box enables or dis-
ables the headphone outputs. The Left Headphone
Volume and Right Headphone Volume track bars set
the headphone volume. The Left HP Enable and Right
HP Enable checkboxes enable the headphone amplifiers.
The Left Headphone Volume and Right Headphone
Volume track bars set the left and right headphone
volume, respectively, to between -64dB (min) to +6dB
(max). Alternatively, the user can enter a numerical
value inside the Left Headphone Volume and Right
Headphone Volume edit boxes.
I2C Interface Indicator
The MAX97001 EV kit software Interface group box dis-
plays the MAX97001’s I2C Device Address, Register
Address, and the last Data Sent. The MAX97001 I2C
device address is internally set to 0x9A.
Simple I2C Commands
There are three methods for communicating with the
MAX97001 EV kit, through the Main Control tab (Figure
1), the Registers tab (Figure 2), or by using low-level
SMBusK commands available in the Advanced User
Interface window (Figure 3). Select the Options | Interface
(Advanced User Interface) menu item to display the
Advanced User Interface window that allows I2C opera-
tions, such as SMBusReadByte and SMBusWriteByte.
Figure 3. Advanced User Interface Window (2-Wire Interface Tab)
SMBus is a trademark of Intel Corp.
MAX97001 Evaluation Kit
Evaluates: MAX97001
8 ______________________________________________________________________________________
Detailed Description of Hardware
The MAX97001 EV kit evaluates the MAX97001 Class D
audio amplifier and stereo DirectDrive headphone ampli-
fier that communicate over I2C. The EV kit demonstrates
the MAX97001 features, such as user-defined input con-
figuration, input gain, input source, output enable, and
volume control.
The EV kit uses the MAX97001 IC in a 20-bump WLP
(2mm x 2mm) package on a proven four-layer PCB
design. The MAX97001 EV kit operates from a 2.7V to
5.5V supply for PVDD and a 1.8V supply for VDD.
Filterless Output
The MAX97001 EV kit’s filterless outputs (OUT+/OUT-)
can be connected directly to a speaker load without
any filtering. Use the OUT+/OUT- test points to connect
the speaker directly to the MAX97001 outputs using a
twisted-pair cable. Do not install inductors L1 and L2 for
maximum efficiency.
Filtered Output
Audio analyzers typically cannot accept pulse-width-
modulated (PWM) signals at their inputs. Therefore, the
MAX97001 EV kit includes a pair of lowpass filters at
the output to ease evaluation. To use the filtering output
pads (FOUT+/FOUT-), install inductors L1 and L2 (pro-
vided with the EV kit), connect the load between FOUT+
and FOUT-, and connect the filtered output to the audio
analyzer. The lowpass filters at the speaker outputs are
optimized for an 8I speaker.
Table 1. Jumper Table
*Default position.
JUMPER SHUNT
POSITION DESCRIPTION
JU1 Closed* On-board I2C (connects on-board SCL signal to the SCL pad)
Open User-supplied I2C (open the jumper and apply the SCL signal to the SCL pad)
JU2 Closed* On-board I2C (connects on-board SDA signal to the SDA pad)
Open User-supplied I2C (open the jumper and apply the SDA signal to the SDA pad)
MAX97001 Evaluation Kit
Evaluates: MAX97001
_______________________________________________________________________________________ 9
Figure 4a. MAX97001 EV Kit Schematic (Sheet 1 of 2)
MAX97001 Evaluation Kit
Evaluates: MAX97001
10 _____________________________________________________________________________________
Figure 4b. MAX97001 EV Kit Schematic (Sheet 2 of 2)
MAX97001 Evaluation Kit
Evaluates: MAX97001
______________________________________________________________________________________ 11
Figure 5. MAX97001 EV Kit Component Placement Guide—
Component Side
Figure 6. MAX97001 EV Kit PCB Layout—Component Side
Figure 7. MAX97001 EV Kit PCB Layout—GND Layer 2
1.0’’
1.0’’ 1.0’’
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
© 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX97001 Evaluation Kit
Evaluates: MAX97001
Figure 8. MAX97001 EV Kit PCB Layout—Power Layer 3 Figure 9. MAX97001 EV Kit PCB Layout—Solder Side
1.0’’ 1.0’’
