19-4926; Rev 0; 8/09
MAX9830A Evaluation Kit
General Description
The MAX9830A evaluation kit (EV kit) is a fully assembled
and tested circuit board that uses the MAX9830A filter-
less Class D amplifier to drive a mono bridge-tied-load
(BTL) speaker in portable audio applications. Designed
to operate from a 2.6V to 5.5V DC power supply, the EV
kit is capable of delivering 2W into a 4I load. The EV
kit accepts differential or single-ended input signals.
The MAX9830A EV kit also evaluates the MAX9830B–
MAX9830E.
Features
S
Industry-Leading Quiescent Current
1.6mA (V
DD
= 5V), 1.2mA (V
DD
= 3.6V)
S
Filterless Operation Passes EN55022B-Radiated
Emissions with Up to 24in (61cm) of Speaker
Cable
S
Evaluates the MAX9830B–MAX9830E
(with IC Replacement)
S
2.6V to 5.5V Single-Supply Operation
S
2W Mono Class D Output
S
Differential or Single-Ended Input
S
Low-Power Shutdown Input
S
Fully Assembled and Tested
Evaluates: MAX9830A–MAX9830E
Ordering Information
PART
MAX9830AEVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
0.1FF
Q10%,
25V X7R ceramic
capacitor (0603)
Murata GRM188R71E104K
TDK C1608X7R1E104K
10FF
Q20%,
6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106M
TDK C1608X5R0J106M
Not installed, ceramic capacitors
(0603)
0.47FF
Q10%,
10V X7R ceramic
capacitors (0603)
TDK C1608X7R1A474K
Murata GRM188R61A474K
0.22FF
Q10%,
25V X7R ceramic
capacitors (0603)
Murata GRM188R71E224K
TDK C1608X7R1E224K
DESIGNATION
JU1
JU2
L1, L2
L3, L4
L5
OUT-, OUT+,
R1, R2
U1
—
—
QTY
1
1
0
2
1
2
2
1
2
1
DESCRIPTION
3-pin header
2-pin header
Not installed, inductors
0I resistors (0805)
Ferrite bead, 100I at 100MHz,
50mI DCR, 3A (0603)
TDK MPZ16085101A
Test points
22I
Q5%
resistors (0603)
Mono Class D amplifier (8 TDFN)
Maxim MAX9830AETA+
Shunts
PCB: MAX9830A EVALUATION KIT+
REQUIRED COMPONENTS
C1
1
REQUIRED COMPONENTS
C2
1
C3, C4
0
C5, C6
2
C7–C11
5
OPTIONAL COMPONENTS
L1, L2
2
22FH
Q20%,
0.7A inductors
TOKO A915AY-220M
_______________________________________________________________
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.
MAX9830A Evaluation Kit
Evaluates: MAX9830A–MAX9830E
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
TOKO America, Inc.
PHONE
770-436-1300
847-803-6100
847-297-0070
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
www.tokoam.com
Note:
Indicate that you are using the MAX9830A when contacting these component suppliers.
Quick Start
U
2.6V to 5.5V, 1A DC supply
U
4I speaker
U
Mono audio signal source
The MAX9830A 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.
1)
Verify that shunts are installed as follows:
JU1: Pins 1-2 (device enabled)
JU2: Installed (single-ended input)
Set the power-supply output to 5V.
Disable the power-supply output.
Connect the power-supply ground to the GND pad
and the power-supply positive output to the VDD
pad on the EV kit.
Verify that the audio source output is disabled.
Connect the mono audio source between the
INPUT+ and INPUT- pads on the EV kit.
Connect the speaker across the OUT+ and OUT-
test points.
Enable the power-supply output.
Enable the audio source.
Detailed Description of Hardware
The MAX9830A EV kit features the MAX9830A filterless
Class D amplifier IC, designed to drive a BTL mono
speaker in portable audio applications. The EV kit oper-
ates from a DC power supply that provides 2.6V to 5.5V
and 1A of current. The EV kit accepts a differential or
single-ended audio input. The audio input source is
amplified to drive 2W into a 4I speaker.
The EV kit provides two sets of differential outputs. The
device outputs (OUT+, OUT-) can be connected directly to
a speaker load, without any filtering, with up to 24in (61cm)
of cable. However, a filter can be added to ease evaluation.
Jumper JU1 enables or disables the speaker amplifier.
See Table 1 for jumper JU1 configuration.
Jumper JU2 provides the option to select between a dif-
ferential or single-ended input mode for the EV kit. See
Table 2 for JU2 configuration.
Recommended Equipment
Procedure
Speaker Amplifier Shutdown
2)
3)
4)
Input Mode
5)
6)
7)
8)
9)
Table 1. Shutdown Input (JU1)
SHUNT
POSITION
1-2*
2-3
*Default
position.
SHDN
PIN
Connected to VDD
Connected to GND
AMPLIFIER
Enabled
Disabled
10) Verify that the speaker is playing the audio source
signal.
Table 2. JU2 Settings
SHUNT
POSITION
Installed*
Not installed
*Default
position.
IN- PIN
Connected to GND
Connected to user-supplied
negative differential input
INPUT
MODE
Single-
ended input
Differential
input
2
______________________________________________________________________________________
MAX9830A Evaluation Kit
The MAX9830A is designed to pass EN55022B emis-
sions standards without any filtering when using up to
61cm of cable to connect the speaker. When evaluating
the MAX9830A without any filtering, connect the speaker
to the outputs (OUT+, OUT-).
The MAX9830A EV kit also features PCB pads for a low-
pass filter that can be added to ease evaluation. Audio
analyzers typically cannot accept the Class D amplifier’s
Optional Output Filtering
pulse-width-modulated (PWM) waveform at their inputs.
The lowpass filter extracts the audio content from the
PWM output signal and allows the device to be con-
nected directly to an audio analyzer. The PWM output
signal can be lowpass filtered by installing 22µH ±20%,
0.7A inductors (TOKO A915AY-220M) at L1 and L2. The
filtered outputs should then be monitored at the FOUT+
and FOUT- pads.
Evaluates: MAX9830A–MAX9830E
Figure 1. MAX9830A EV Kit Schematic
_______________________________________________________________________________________
3
MAX9830A Evaluation Kit
Evaluates: MAX9830A–MAX9830E
1.0”
1.0”
Figure 2. MAX9830A EV Kit Component Placement Guide—
Component Side
Figure 3. MAX9830A EV Kit PCB Layout—Component Side
1.0”
Figure 4. MAX9830A 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.
4
©
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.
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