19-5979; Rev 0; 7/11
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
General Description
The MAX98309 evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX98309
mono 1.4W Class AB audio amplifier. The amplifier gain
can be set through external resistors. The EV kit operates
from a single 2.5V to 5.5V power supply.
The EV kit can also evaluate the MAX98310 internally
fixed gain mono 1.4W Class AB audio amplifier.
S
2.5V to 5.5V Single-Supply Operation
S
Differential or Single-Ended Input
S
Pin-Selectable Turn-On Time
S
1.8V Logic-Compatible
SHDN
Input
S
Proven PCB Layout
S
Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
Features
Component List
DESIGNATION
C1, C2, C3
QTY
3
DESCRIPTION
1FF
Q10%,
16V X5R ceramic
capacitors (0402)
TDK C1005X5R1C105K
10FF
Q10%,
6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106K
0.1FF
Q10%,
16V X7R ceramic
capacitor (0402)
Murata GRM155R71C104K
Binding posts
White side-entry, PCB-mount
phono jack
DESIGNATION
JU1
JU2
JU3
R1–R4
SHDN
U1
—
—
QTY
1
1
1
4
1
1
3
1
DESCRIPTION
3-pin header
4-pin header
2-pin header
10kI
Q1%
resistors (0402)
PCB miniature red test point
Mono 1.4W Class AB audio
amplifier (9 WLP)
Maxim MAX98309EWL+
Shunts
PCB: MAX98309 EVALUATION
KIT
C4
1
C5
GND, OUT+,
OUT-, VDD
IN
1
4
1
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
PHONE
770-436-1300
847-803-6100
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
Note:
Indicate that you are using the MAX98309 when contacting these component suppliers.
_________________________________________________________________
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.
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
Quick Start
•
•
•
•
MAX98309 EV kit
8I speaker
Mono audio signal source
Recommended Equipment
2.5V to 5.5V DC supply
The EV kit features 2-pin jumper JU1 to control the active-
low shutdown input of the IC. Drive
SHDN
high to place
the device in normal operation; drive
SHDN
low to place
the device in the low-power shutdown mode. See Table 1
for shunt positions.
The MAX98309/MAX98310 have excellent click-and-pop
performance with respect to the
SHDN
pin activation/
deactivation.
Jumper JU2 demonstrates the IC’s selectable turn-on-
time feature for optimized click-and-pop performance.
Connect TON to GND for a 10ms turn-on time. Connect
TON to VDD for a 100ms turn-on time. See Table 2 for
selectable turn-on times.
The MAX98310 has a preset 5ms turn-on time.
The EV kit provides resistors R1–R4 to externally set the
differential gain. The default gain is 1V/V or 0dB. Set the
gain of the amplifier as follows:
A
V
=
R
F
R
IN
Shutdown Mode (SHDN)
Turn-On Time
The 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 2-3 (device enabled)
JU2: Pins 1-2 (turn-on time of 100ms)
JU3: Installed (single-ended input)
2)
Connect the positive terminal of the power supply
to the VDD PCB pad on the EV kit. Connect the
negative terminal of the power supply to the GND
PCB pad on the EV kit.
Verify that the audio source output is disabled.
Connect the single-ended mono audio source to the
IN phono jack or between the IN+ and IN- PCB pads
on the EV kit.
Connect the speaker across the OUT+ and OUT-
test pads.
Set the power-supply output to 3.7V.
Enable the power-supply output.
Enable the audio source.
Procedure
Amplifier Gain
4)
5)
6)
7)
8)
9)
where A
V
is the desired voltage gain, R
F
is the value of
feedback resistors R2 and R4, and R
IN
is the value of
input resistors R1 and R3.
When evaluating the MAX98310, jumper JU2 controls
the GAIN input pin and selects the four internally fixed
differential gain options. See Table 2 for selectable gain
options.
Jumper JU3 provides the option to select between a
differential or single-ended input mode for the EV kit. See
Table 3 for jumper JU3 configurations.
10) Verify that the speaker is playing the audio source
signal.
Input Mode
Detailed Description of Hardware
The MAX98309 EV kit is a fully assembled and tested
circuit board that evaluates the MAX98309 mono 1.4W
Class AB audio amplifier. The amplifier gain can be set
through external resistors.
The EV kit can also evaluate the MAX98310 internally fixed
gain mono 1.4W Class AB audio amplifier. To evaluate
the MAX98310, remove R2 and R4, and replace R1 and
R3 with 0I resistors.
Table 1. Shutdown Mode (JU1)
SHUNT
POSITION
1-2
2-3*
*Default
position.
SHDN
PIN
Connected to GND
Connected to VDD
DEVICE
OPERATION
Disabled
Enabled
_________________________________________________________________
Maxim Integrated Products
2
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