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MAX98400A Evaluation Kit
Detailed Description of Hardware
The MAX98400A EV kit provides a proven layout for eval-
uating the MAX98400A. The EV kit is designed to evaluate
the device in a 36-pin TQFN package with an exposed
pad. The device is a Class D amplifier that can be config-
ured to drive 2x20W into a pair of 8? speakers, or 1x40W
into a 4? speaker. The EV kit operates from a DC power
supply that provides 8V to 28V and 5A of current. The EV
kit PCB is designed with two layers and has 2oz copper
for optimized power dissipation. Each side of the EV
kit accepts a pair of differential or single-ended input
signals and provides two sets of amplified differential
audio outputs.
Optional External Preamplifier
Power Supply (VS)
The EV kit provides input pads (VS1 for U1 and VS2 for
U2) to accept an optional 5V external power supply for
powering the device’s preamplifiers when the internal
regulator is disabled. The external power supply for the
preamplifiers must be in the 4.5V to 5.5V range.
Filterless Output (U1)
The EV kit’s filterless outputs (SPKL1+/SPKL1- and
SPKR1+/SPKR1-) can be connected directly to a pair of
speaker loads without any filtering.
Output Filtering Requirements (U1)
The device can pass CE EN55022B regulations with only
ferrite-bead filters, especially when speaker-wire lengths
are less than or equal to 1m. To install the ferrite-bead
filters, first remove the 0? resistors (R111–R114). Next,
replace resistors R111–R114 with ferrite beads listed
in Table 3 (provided with the EV kit), and install filter
capacitors on the C111–C114 pads. The speaker wire
should be connected to the L1+/L1- and R1+/R1- test
points. Although component selection for the output filter
is dependent on speaker-wire length, the components in
Table 3 are provided with the EV kit as a starting point.
Final component selection should be determined during
EMC testing. Contact the factory, if required. Note that
an inductive load is required at this terminal. If using an
8? power resistor, add a 68μH series inductor. If using a
4? power resistor, add a 33μH series inductor.
Filtered Output (U2)
Audio analyzers typically cannot accept pulse-width
modulated (PWM) signals at their inputs. Therefore,
the EV kit features a pair of lowpass filters at each of
the outputs to ease evaluation. Use the filtering output
posts (FOUTL2+/FOUTL2- and FOUTR2+/FOUTR2-) to
connect the filtered PWM outputs to the audio analyzer.
The default lowpass filters at the EV kit outputs are opti-
mized for a pair of 8? power resistors or 8? speakers.
Mono Mode (MONO)
The EV kit is preconfigured for stereo mode at the facto-
ry. To change the EV kit to operate in mono mode, short
jumper MONO_1 (U1) or MONO_2 (U2) with a shorting
wire, connect SPKL1- to SPKR1- (U1) or FOUTL2- to
FOUTR2- (U2) with a short banana-lead cable, and
connect SPKL1+ to SPKR1+ (U1) or FOUTL2+ to
FOUTR+2 (U2) with a short banana-lead cable. Connect
the audio input source to the INL1 or INL2 RCA jack.
Thermal Foldback
As shipped from the factory, the thermal-foldback
feature is enabled (TEMP_1 and TEMP_2 jumpers open).
To disable thermal foldback, install a shunt across the
TEMP_1 and TEMP_2 jumpers. Refer to the MAX98400A/
MAX98400B IC data sheet.
Limiter
As shipped from the factory, the limiter-threshold control
is disabled. To enable the limiter in PVDD tracking mode,
move the LIM_1 or LIM_2 shunt to the 2-3 position. To
enable the limiter in programmable mode, leave the
LIM_1 or LIM_2 jumper open and select appropriate val-
ues for R103, R104, and R105 or R203, R204, and R205.
Refer to the MAX98400A/MAX98400B IC data sheet for
information on selecting these component values.
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