Datasheet
MAX97220A Evaluation Kit
Evaluates: MAX97220A–MAX97220D
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Quick Start
Recommended Equipment
• MAX97220A EV kit
• 2.5V to 5.5V DC supply
• Stereo audio signal source
• Pair of stereo headphones
Procedure
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 a shunt is installed across jumper JU1
(device enabled).
2) Set the power-supply output to 5V.
3) Disable the power-supply output.
4) Connect the power-supply ground to the GND pad
and the power-supply positive output to the VDD
pad on the EV kit.
5) Connect headphones to the stereo headphone jack
(HP_OUT) provided on the EV kit.
6) Verify that the audio source output is disabled.
7) Connect the left output of the audio source to the
INL- pad.
8) Connect the ground of the audio source to the INL+
pad.
9) Connect the right output of the audio source to the
INR- pad.
10) Connect the ground of the audio source to the INR+
pad.
11) Enable the stereo audio source.
12) Enable the power-supply output.
13) Verify that the headphones are playing the audio
source signal.
Detailed Description
The MAX97220A EV kit features the MAX97220A differen-
tial stereo headphone driver with DirectDrive, designed
to directly drive a 125mW into a 32I stereo headphone.
The EV kit operates from a DC power supply that can
provide 2.5V to 5.5V and accepts two sets of differential
audio inputs.
Headphone Amplifier Shutdown
Jumper JU1 enables or disables the headphone ampli-
fier. See Table 1 for jumper JU1 configuration.
MAX97220C/MAX97220D Usage
When replacing the MAX97220A with either the
MAX97220C or MAX97220D, several external compo-
nents must be changed. R1–R4 should be replaced with
0ω resistors. R5–R8 should be removed from the PCB.
C11–C16 should be left uninstalled (same as the default
EV kit setting).
Table 1. Shutdown Input (JU1)
*Default position.
SHUNT POSITION
SHDN PIN
AMPLIFIER
Installed* Connected to VDD Enabled
Not installed
Connected to GND
through R9
Disabled