MAX98309EVKIT# Maxim Integrated, MAX98309EVKIT# Datasheet - Page 2

• Manufacturer Part Number: MAX98309EVKIT#
• Description: Audio IC Development Tools MAX98309 Eval Kit
• Manufacturer: Maxim Integrated
• Type: Audio Amplifiersr
• Series: MAX98309, MAX98310r

Specifications of MAX98309EVKIT#

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX98309
• Operating Supply Voltage: 2.5 V to 5.5 V
• Description/function: MAX98309 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX98309 mono 1.4W Class AB audio amplifier

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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:
2) Connect the positive terminal of the power supply
4) Verify that the audio source output is disabled.
5) Connect the single-ended mono audio source to the
6) Connect the speaker across the OUT+ and OUT-
7) Set the power-supply output to 3.7V.
8) Enable the power-supply output.
9) Enable the audio source.
10) Verify that the speaker is playing the audio source
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.
Detailed Description of Hardware
MAX98309 EV kit
2.5V to 5.5V DC supply
8I speaker
Mono audio signal source
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.
IN phono jack or between the IN+ and IN- PCB pads
on the EV kit.
test pads.
signal.
JU1: Pins 2-3 (device enabled)
JU2: Pins 1-2 (turn-on time of 100ms)
JU3: Installed (single-ended input)
_________________________________________________________________ Maxim Integrated Products 2
Recommended Equipment
Quick Start
Evaluates: MAX98309/MAX98310
Procedure
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:
where A
feedback resistors R2 and R4, and R
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.
Table 1. Shutdown Mode (JU1)
*Default position.
POSITION
SHUNT
2-3*
1-2
V
is the desired voltage gain, R
Connected to GND
Connected to VDD
A
SHDN PIN
V
Shutdown Mode (SHDN)
=
R
R
IN
F
Amplifier Gain
IN
Turn-On Time
F
is the value of
is the value of
Input Mode
OPERATION
Disabled
DEVICE
Enabled