REFAUDIODMA12070PTOBO1

UM 1902 PL88 1902 171735 TM User manual for MERUS 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 2 interference tests. Finally, Appendix A provides sample code that demonstrates basic I C communication using Arduino UNO. Intended audience Audio amplifier design engineers, audio system engineers and audio software engineers. 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 User manual for MA120xxx reference boards Board overview Table of contents About this document ....................................................................................................................... 1 Table of contents ............................................................................................................................ 2 1 Board overview ...................................................................................................................... 3 1.1 General board specifications .................................................................................................................. 4 1.2 RFB device type ....................................................................................................................................... 4 1.3 Set-up guide ............................................................................................................................................ 4 1.4 Board configuration ................................................................................................................................ 6 2 1.5 Device configuration through I 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 Appendix A sample code ...................................................................................................... 25 Revision history............................................................................................................................. 27 Application Note 2 of 28 V 1.0 2019-04-28