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MAX98304 Evaluation Kit
Shutdown
JU2 enables or disables the audio speaker amplifier. See
Table 2 for JU2 configuration.
Gain Setting
The EV kit maximum signal gain can be configured to
five different settings. JU3 selects the overall gain for the
EV kit. See Table 3 for JU3 configuration.
Filtered Output
Audio analyzers typically cannot accept pulse-width-
modulated (PWM) signals at their inputs. Therefore, the
EV kit features the option to install a lowpass filter at its
outputs to ease evaluation. OUT+ and OUT- are shorted
to FOUT+ and FOUT-. The trace must be broken at L1
and L2 before installing inductors L1 and L2 (provided
with the EV kit). The filter components (C7–C11, R3, and
The IC can pass CE EN55022B regulations with 60cm
of speaker cable and no filtering. However, ferrite-bead
filters can be used to achieve further attenuation of radi-
ated emissions. To install the ferrite-bead filters, replace
shorting resistors FB1 and FB2 with 0603 or smaller
ferrite beads and install filter capacitors on the C5 and
C6 pads. The speaker wire should be connected to the
FOUT+ and FOUT- pads.
Filterless Output
The EV kit’s filterless outputs (OUT+ and OUT-) can be
connected directly to a speaker load without any filtering.
Use the OUT+ and OUT- test points or the FOUT+ and
FOUT- pads to connect a speaker directly to the IC out-
puts. Inductors L1 and L2 are not installed for maximum
efficiency.
GAIN PIN
R4) are provided with the EV kit and must be installed
prior to operation. Use FOUT+ and FOUT- to connect the
filtered PWM outputs to an audio analyzer. The default
lowpass filter at the EV kit outputs is optimized for an 8 I
speaker. Contact the factory for the 4 I speaker filter.
Table 3. Gain Setting (JU3)
SHUNT
POSITION
Open Not connected
MAXIMUM
GAIN (dB)
0
Table 2. Shutdown (JU2)
1-2
Connected to PVDD
through R1
+3
SHUNT
POSITION
1-2*
2-3
SHDN PIN
Connected to PVDD
Connected to PGND
AMPLIFIER
Enabled
Disabled
1-3
1-4
1-5*
Connected to PVDD
Connected to PGND
through R2
Connected to PGND
+6
+9
+12
*Default position.
*Default position.
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