Infineon EVAL AUDIO MA12040 User manual

QUICK START GUIDE
Class D Audio Team
March 2019
EVAL_AUDIO_MA12040

Product overview and features
Overview
The demonstration board EVAL_AUDIO_MA12040 is an evaluation and demonstration
board for MERUS™ audio MA12040.It contains analog inputs and a variety of output
and setup/selection features. It also contains two on-board power supply generators (5 V
and 3.3 V buck-converted) so only one external power supply (PVDD) is necessary. The
board can be used for evaluating or demonstrating key features/advantages of the
MERUS™ technology:
>Energy efficiency: Power losses at typical audio listening levels / Idle power loss
>Adaptive power management system
>Minimum output filter components: Significant cost and size reduction.
>THD performance and audio quality
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›General features and audio performance
Number of audio channels
2xBTL, 1
xPBTL, 1xBTL+2xSE
Audio input format
Analog
Amplifier gain
20
dB / configurable 26dB
Supply voltage
18
V
Output noise level
<
100 uVrms(AW)
Dynamic range
>
100 dB
Idle consumption @ PVDD=18V
<
16 mA
Crosstalk
<
-85 dB
Efficiency, full
-scale, 8 ohm
91
%
Figure 1. Overview of EVAL_AUDIO_MA12040 evaluation board

Board description
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>Recommended operation conditions
Parameter Part Nr Minimum
Nominal
Maximum Unit
PVDD MA12040 5.5 18 V
Output peak current MA12040 6.0 A
AC Analog input level
IN0A, IN0B, IN1A, IN1B
MA12040 6.0 Vpk
Parameter Conditions Typ Unit
Output power p/channel (peak)
THD+N = 10%, RL =
4 Ω, f =
1 kHz
40 W
Output power p/channel (peak)
THD+N = 10%, RL =
8 Ω, f =
1 kHz
20 W
Total harmonic distortion + noise
1kHz, POUT =
1 W, RL = 4 Ω 0.008 %
Total harmonic distortion + noise
1kHz, POUT =
20 W, RL = 4 Ω 0.010 %
Efficiency*
POUT =
2×40 W, 4Ω , PMP = 0 87 %
Efficiency*
POUT =
2×20 W, 8Ω , PMP = 0 91 %
>Typical audio and electrical specifications
(BTL default configuration; Power Mode Profile = 0)
USB control
interface
Speaker
output
terminals
Power supply terminals
Device
enable/
mute
Output
configuration
jumpers
I2C
address
selection
3V3 / 5 V internal supply with
measurement and enable
jumpers
Power input
measurement
jumpers
Error and clipping
reading outputs
I2C
serial
clock
and data
Figure 2. Top board view of EVAL_AUDIO_MA12040
0B
GND
0A
1A
GND
1B
Analog
audio input
(non p versions)
I2S digital
audio input
(p versions only)
* Efficiency values do not take into account the 5 V and 3V3 board power supplies’ consumption.

Default configuration for a quick start
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Bridge tied load (BTL)
outputs
Slides 4 and 5 describe the start up and quick start
operation procedures with the following configuration:
Single ended audio sources
Verify that the jumpers are set in the following positions:
Jumper State Picture
MSEL0
H
MSEL1
L
CLK M/S
H(M)
AD0 & AD1
L
Analog audio
Jack input = all jumpered
Balanced input = use individual
pints.
Digital audio
Do not Jumper
PVDD MEAS
Jumpered
3V3 & 5V
MEAS
Jumpered
REG EN_N
Do not Jumper
Figure 3. Bridge tied load (BTL) configuration with single ended inputs for MA12040
Note: Please refer to the manual for other Input/Output configurations. Typically
balanced/differential inputs should be used to obtain optimum audio performance.

Power up and start procedure
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3. Open your web browser and download the software from the following
Link. A complete folder will be downloaded with the executable file
“MA120xx_GUI” of gui software.
Although it is not necessary to configure the MA12040 for quick start
purposes, the following slides describe also the installation process of
its software tool. This will allow to monitor and configure the power
mode profiles. Power mode profile 0 is configured by default.
2. Open your web browser and download the USB control interface drivers
from the following Link. Press “setup executable” to download the
automatic installation. Run the downloaded file “CDM21228_Setup” and
follow the instructions to install the driver. Do not connect the USB cable
while the installing process in running.
1. Before connecting any source or load (speaker) make sure all of them
are turned off.
4. Make sure toggle buttons are in “shutdown” and “mute”
positions.
5. Connect all the sources and speaker/load cables:
a) Audio source to the analog audio jack input
b) Power source and its ground to PVDD and GND
c) Speaker/load to audio output terminals
d) USB control interface to the computer.
Figure 4. File download for USB control interface drivers
Figure 5. File download for GUI software
Figure 6. Toggle buttons set to “mute” and “shutdown”
Figure 7. Complete evaluation board connections.

Power up and start procedure
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6. Turn on the PVDD supply
7. Start board by setting toggle switch to “enable” position.
10. Start playing music from your audio source and set the toggle
switch to “play” position. You will be able to monitor the
modulation index of both channels and the their current
power modes. Also, the power mode profiles can be
selected. For more information on power mode profiles
please refer to the MA12040 data sheet and Infineon
MERUS™ evaluation board user’s guide.
8. Open the “MA120xx_GUI”file to run the monitoring interface.
9. If the connection was successful it will be indicated in the ID
status line:
Figure 9. MA120xx control software interface
Figure 8. Left toggle switch set to “enable” position.
Figure 10. Control interface indicating a
successful communication with the board.
Figure 11. Right toggle switch set to “play” position.

Audio measurements set up
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MA120xx and MA120xxP are filterless amplifiers enabled by
it’s MERUS™audio multilevel technique. However, in order
to obtain reliable measurements results an external low-pass
filter is required in front of the input stage. This is because
fast transients in the switching output signal might stress the
bandlimited input of measurement instruments. Therefore,
slew rate limiting and other distortion artifacts may appear
due to this stress if no external filtering is applied.
The need for an external filter:
Figure 12. Measurement setup for MA120xx amplifiers.

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