Infineon MERUS MA120 Series, MERUS MA12070, MERUS MA12040P, MERUS MA12040, MERUS MA12070P User Manual

Application Note Please read the Important Notice and Warnings at the end of this document V 1.0

www.infineon.com/merus page 1 of 28 2019-04-28

UM_1902_PL88_1902_171735

User manual for MERUS

TM

MA120xxx reference

boards

P100002130 REF_AUDIO_MA12040

P100002140 REF_AUDIO_MA12040P

P100002170 REF_AUDIO_MA12070

P100002180 REF_AUDIO_MA12070P

About this document

Scope and purpose

This is a reference and demonstration board for MA12040, MA12040P, MA12070 and MA12070P proprietary multi-level amplifiers.

This application note describes the functionality and set-up of the reference design (Sections 2 and 3). It also includes a schematic, PCB layout, BOM and a discussion of circuit design considerations (Section 4). Measurement results (Section 5) show high performance in audio and efficiency parameters, as well as good thermal characteristics. Testing included a frequency sweep, output power sweep and electromagnetic interference tests. Finally, Appendix A provides sample code that demonstrates basic I2C communication using Arduino UNO.

Intended audience

Audio amplifier design engineers, audio system engineers and audio software engineers.

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User manual for MA120xxx reference boards

Board overview

1 Board overview

The reference board (RFB) is a reference and demonstration board for Infineon’s MA12040, MA12040P, MA12070 and MA12070P amplifiers. See the board in Figure 1 with MA12070 mounted.

It contains a variety of digital/analog input, output and set-up/selection features. It also contains one on-board power supply (5 V buck converter), so only one external power supply (PVDD) is necessary.

Figure 1 Reference board PCB

The board can be used for evaluating or demonstrating key features/advantages of the MERUSTM Audio technology:

 Energy efficiency

− Power losses under normal user operating conditions (listening levels)

− Idle power loss

 Adaptive power management system  No output filter components

− Solution cost and size reduction

 Audio performance

− THD performance and audio quality

 Fast product protyping

− All design files are available

− Guides as reference for product design-in

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User manual for MA120xxx reference boards

Board overview

1.1 General board specifications

 Number of audio channels 2 x BTL or 1 x PBTL  Audio input format:

o MA12040 and MA12070 Analog o MA12040P and MA12070P Digital (I

2

S)

 Supply voltage range MA12040(P) 5 to 18 V  Supply voltage range MA12070(P) 5 to 26 V  Maximum output current per channel MA12040(P) 6 A  Maximum output current per channel MA12070(P) 8 A  Output power capability at 18 V PVDD:

o Peak 2 x 40 W sine 1 kHz (RMS) into 4 Ω (10 percent THD + N) o Peak 2 x 20 W sine 1 kHz (RMS) into 8 Ω (10 percent THD + N) o Continuous 2 x 9.0 W sine 1 kHz (RMS) into 4 Ω (less than 0.08 percent THD + N)

 Output power capability at 26 V PVDD:

o Peak 2 x 80 W sine 1 kHz (RMS) into 4 Ω (10 percent THD + N) o Peak 2 x 40 W sine 1 kHz (RMS) into 8 Ω (10 percent THD + N) o Continuous 2 x 9.0 W sine 1 kHz (RMS) into 4 Ω (less than 0.02 percent THD + N)

 Amplifier gain (MA12040 and MA12070 only) 20 dB or 26 dB (register configurable)  Output integrated noise:

o MA12040 and MA12070 Less than 100 µV

rms

(AW)

o MA12040P and MA12070P Less than 150 µV

rms

(AW)

 Dynamic range:

o MA12040 and MA12070 More than 100 dB o MA12040P and MA12070P More than 96 dB

 Idle current consumption at 18 V PVDD:

o MA12040 and MA12070 Less than 16 mA o MA12040P and MA12070P Less than 19 mA

Note: Idle consumption is the sum of output stage current and 5 V supply current. As all the supplies are tied to

PVDD, the efficiency of the buck converter 5 V should be taken into account when measuring idle current consumption directly from PVDD. Please refer to the MA120xx/P device datasheet for exact current figures.

1.2 RFB device type

The type of device (MA12040, MA12040P, MA12070 and MA12070P) on the RFB is printed on the top of the device, and is also stated on the serial number label placed on the bottom side of the PCB.

1.3 Set-up guide

The RFB works out of the box with speakers, input source and power connected. No external configuration or set-up is needed for quick start-up.

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User manual for MA120xxx reference boards

Board overview

Figure 2 shows the top view of the board assembly. The board has following key features, which are indicated by corresponding numbers marked with red.

1. PVDD power connector: connect PVDD 5 V to 18 V for MA12040(P) or connect PVDD 5 V to 26 V for

MA12070(P)

2. BTL output connection channel 0

3. BTL output connection channel 1

4. PAUDIO: signal input connector: o For MA12070 devices:

 Pin 5: AN0A – analog input A channel 0  Pin 4: AN0B – analog input B channel 0  Pin 3: GND  Pin 2: AN1A – analog input A channel 1  Pin 1: AN1B – analog input B channel 1

o For MA12070P devices:

 Pin 5: SCK – I

2

S bit clock

 Pin 4: WS – I

2

S word clock

 Pin 3: GND  Pin 2: SD0 – I

2

S audio data

 Pin 1: CLK – I

2

S master clock

5. PCTRL external communication:

 Pin 5: SCL – I

2

C clock

 Pin 4: SDA – I

2

C data

 Pin 3: GND  Pin 2: /ENABLE – enable or disable the amplifier  Pin 1: /MUTE – mute or unmute the amplifier

6. MA12040, MA12040P, MA12070 or MA12070P Eximo multi-level amplifier IC

7. Buck regulator: TPS62175 – for generating 5 V supply

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User manual for MA120xxx reference boards

Board overview

Figure 2 Schematic top view of component and connector assembly

1.4 Board configuration

The board is shipped with a default configuration for automatic start-up, two channels of BTL output, and default internal register settings. It is however possible to operate the board in different modes. The following configurations are possible:

 BTL or PBTL output configuration:

o BTL: RPBTL unmounted; RBTL mounted o PBTL: RPBTL mounted; RBTL unmounted

 External control of the /ENABLE pin: RENABLE unmounted  External control of the /MUTE pin: RMUTE unmounted

The board can carry MA12040(P) or MA12070(P) devices. Depending on which device is placed, the following configurations apply for:

 MA12040 and MA12070:

o CAPIN0A, CAPIN0B, CAPIN1A and CAPIN1B are mounted o RCLK_ANA mounted; RCLK_DIG unmounted o RCLK unmounted

 MA12040P and MA12070P:

o CAPIN0A, CAPIN0B, CAPIN1A and CAPIN1B replaced by jumpers o RCLK_ANA unmounted; RCLK_DIG mounted o RCLK mounted

Application Note 7 of 28 V 1.0 2019-04-28

User manual for MA120xxx reference boards

Board overview

1.5 Device configuration through I

2

C

Multi-level technology offers the possibility to optimize for audio performance, efficiency or EMI. Depending on the application, typically one parameter is more important than the others. The amplifiers offer the flexibility to make this design trade-off by the use of different optimal modes (Power Mode Profiles or PMP), selected through internal register settings. The RFB uses the MA120XXX in the default PMP0, which optimizes the amplifier operation for highest power efficiency in the low to mid output power region. For a complete overview of device configurations, please refer to the datasheets. I2C is used to read and write the internal registers. SCL and SDA can be accessed through Pin 5 and Pin 4 on the

PCTRL header (see previous section). Figure 3 shows how to set up I2C communication using an Arduino UNO. Sample code for I2C set-up can be found in Apendix A – sample code.

Figure 3 Arduino I

2

C communication to the RFB

Pull-up

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User manual for MA120xxx reference boards

Schematic, layout and design considerations

2 Schematic, layout and design considerations

Figure 4 Reference board schematic

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User manual for MA120xxx reference boards

Schematic, layout and design considerations

Figure 5 Top side of the PCB layout

Infineon MERUS MA120 Series, MERUS MA12070, MERUS MA12040P, MERUS MA12040, MERUS MA12070P User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

About this document

Table of contents

1 Board overview

1.1 General board specifications

1.2 RFB device type

1.3 Set-up guide

1.4 Board configuration

2 Schematic, layout and design considerations