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Infineon MERUS MA12070P User Manual Download Page 15

  

 

Application Note 

15 of 28 

V 1.0  

                                                                                                                                                                                                                                                                    2019-04-28  

User manual for MA120xxx reference boards 

  

Measurement results 
 

   

3.2

 

Output power sweep 

Output power sweeps were carried out on both channels with a 1 kHz input signal. 

 

 

 

 

Figure 9

 

THD + N vs. output power 

 

 

0,01

0,1

1

10

100

0,001

0,01

0,1

1

10

100

TH

D

+N

 [%

]

Frequency [Hz]

Channel 1

Channel 2

Summary of Contents for MERUS MA12070P

Page 1: ...roprietary 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 swee...

Page 2: ...up guide 4 1 4 Board configuration 6 1 5 Device configuration through I2 C 7 2 Schematic layout and design considerations 8 2 1 BOM 11 2 2 Design considerations 12 3 Measurement results 13 3 1 Frequency sweep 13 3 2 Output power sweep 15 3 3 Output spectrum 16 3 4 Power consumption and efficiency 17 3 5 EMI radiated measurements 20 3 5 1 EMI measurement setup 20 3 5 2 EMI measurement results 20 4 ...

Page 3: ...tains 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 compo...

Page 4: ...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 µVrms AW o MA12040P and MA12070P Less than 150 µVrms 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 tha...

Page 5: ...IO 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 I2 S bit clock Pin 4 WS I2 S word clock Pin 3 GND Pin 2 SD0 I2 S audio data Pin 1 CLK I2 S master clock 5 PCTRL external communication Pin 5 SCL I2 C clock Pin 4 SDA...

Page 6: ...urations 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 ...

Page 7: ...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 I2 C is used to read and write the internal registers SCL and SDA can be accessed through Pin 5 and Pi...

Page 8: ...plication Note 8 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Schematic layout and design considerations 2 Schematic layout and design considerations Figure 4 Reference board schematic ...

Page 9: ...Application Note 9 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Schematic layout and design considerations Figure 5 Top side of the PCB layout ...

Page 10: ...ttom side of the PCB layout The RFB is cost optimized The cost of one module including PCB components and assembly is estimated to be 2 15 at a volume of 1000 pieces The price of the MA120xx P amplifier depends on the volume and part For performance optimization see the application note EMC output filter recommendation or contact Infineon ...

Page 11: ...B CAP 1 µF 50 V 10 percent X5R 0805 Multicomp MC0805X105K500CT 4 CIN0 CIN1 CAP 0 022 µF 10 percent X7R 50 V 0402 Murata GRM155R71H223KA12D 2 CINBUCK CAP 2 2 µF 50 V 10 percent 0805 Taiyo Yuden UMK212BB7225KG T 1 COUTBUCK CAP 22 µF 50 V 10 percent 0805 Murata GRM21BR61A226ME51L 1 CSUP1 CSUP2 Electrolytic cap UWT series 100 µF 35 V Nichicon UWT1V101MCL1GS 2 L0A L0B L1A L1B SMD ferrite bead Z 56 Ω Fa...

Page 12: ...e bottom plate can function as a heatsink for the amplifier IC o Vias placed between bottom and top ground planes add to the copper mass that functions as a heatsink Filterless operation o Multi level technology also significantly reduces out of band noise which allows LC filter free operation Only a small SMD sized EMI filter is needed o Figure 1 shows the footprint and PCB size it takes The boar...

Page 13: ...sumption and efficiency EMI All measurement results were obtained using the following settings Device MA12070 Two channel BTL configuration Load 4 Ω 22 μH series inductance PVDD 18 V Gain setting 20 dB PMP default PMP0 Measurements carried out with APx 515 AUX 0025 input filter APx uses AES17 brick wall filter 20 kHz 3 1 Frequency sweep Frequency sweeps were carried out with both channels at 1 W o...

Page 14: ...oards Measurement results Figure 8 THD N vs frequency To improve the THD N performance use high performance ferrite beads See the application note EMC output filter recommendations at www Infineon com 0 001 0 01 0 1 1 10 100 10 100 1000 10000 THD N Frequency Hz Channel 1 Channel 2 ...

Page 15: ...MA120xxx reference boards Measurement results 3 2 Output power sweep Output power sweeps were carried out on both channels with a 1 kHz input signal Figure 9 THD N vs output power 0 01 0 1 1 10 100 0 001 0 01 0 1 1 10 100 THD N Frequency Hz Channel 1 Channel 2 ...

Page 16: ...at has been obtained by applying 1 mVrms 1 kHz input signal to both channels This gives an output signal of 40 dBV The noise floor for these settings is shown in the Figure 10 The integrated A weighted noise floor number for both channels is 70 µVrms AW Figure 10 Output FFT spectrum 160 140 120 100 80 60 40 20 0 20 40 20 200 2000 20000 Level dBV Frequency Hz Ch0 Ch1 ...

Page 17: ...umption and efficiency measurements were obtained by using a test signal of 1 kHz and a load of 4 Ω with 22 μH series inductance Power consumption was calculated using the RMS method Figure 12 Input power as a function of output power 0 02 0 016 0 012 0 008 0 004 0 0 004 0 008 0 012 0 016 0 02 0 0 0005 0 001 0 0015 0 002 Level V Time s Ch0 Ch1 0 1 1 10 100 0 00001 0 0001 0 001 0 01 0 1 1 10 100 In...

Page 18: ...tion Note 18 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Measurement results Figure 13 Power loss as a function of output power Figure 14 Efficiency as a function of output power log scale ...

Page 19: ...Application Note 19 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Measurement results Figure 15 Efficiency as a function of output power linear scale ...

Page 20: ...t power at 20 dB gain 1 W average output power per channel Speaker cable length 10 cm Amplifier load 4 Ω speaker Visaton FR 10 WP EMI filter Murata ferrite BLE32PN300SN1L 1 nF capacitor Pi filter on PVDD Würth ferrite 74279221100 2 x 22 nF capacitor 3 5 2 EMI measurement results EMI radiated results were collected for the reference board using four scenarios Board was positioned toward the antenna...

Page 21: ...lication Note 21 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Measurement results Figure 17 EMI radiated measurement results Board positioned toward antenna Antenna position is vertical ...

Page 22: ...ication Note 22 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Measurement results Figure 18 EMI radiated measurement results Board positioned toward antenna Antenna position is horizontal ...

Page 23: ...n Note 23 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Measurement results Figure 19 EMI radiated measurement results Board positioned perpendicular to the antenna Antenna position is vertical ...

Page 24: ... Note 24 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Measurement results Figure 20 EMI radiated measurement results Board positioned perpendicular to the antenna Antenna position is horizontal ...

Page 25: ...in 3 GND pin 2 Revisions D1a use of external lib initial test working F1 final version for demonstration This code is free software you can redistribute it and or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation either version 2 1 of the License or at your option any later version include I2C h const byte LED 13 LED pin number const by...

Page 26: ...rite LED 0 set audio_in_mode_ext I2c begin I2c write 0x20 0x27 0x28 audio_in_mode_ext 1 I2c end set in 26dB audio_in_mode I2c begin I2c write 0x20 0x25 0x30 audio_in_mode 1 I2c end set in 20dB audio_in_mode I2c write 0x20 0x25 0x10 audio_in_mode 0 digitalWrite LED 0 end of setup void loop wait for interrupt void write_I2C bool dB I2c begin if dB true I2c write 0x20 0x25 0x30 audio_in_mode 1 else I...

Page 27: ...cation Note 27 of 28 V 1 0 2019 04 28 User manual for MA120xxx reference boards Appendix A sample code Revision history Document version Date of release Description of changes 1 0 24 01 2019 Initial release ...

Page 28: ...f intellectual property rights of any third party with respect to any and all information given in this application note The data contained in this document is exclusively intended for technically trained staff It is the responsibility of customer s technical departments to evaluate the suitability of the product for the intended application and the completeness of the product information given in...

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