USB Audio Decoder ICs - BU94501AMUV

ROHM's USB Audio Decoder ICs integrate a USB 2.0 host, SD memory card controller, AAC decoder, WMA decoder, MP3 decoder, Audio DAC amp, and a system controller all on a single chip, allowing easy playback of music stored in USB flash memory using an audio player. They can be easily added to virtually any audio device (i.e. CD player, mini-component stereo, portable player, car stereo) for greater functionality.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BU94501AMUV-E2 Active VQFN40 2000 2000 Taping Yes
Vcc(Min.)[V] 3.0
Vcc(Max.)[V] 3.6
Digital Audio I/F I2S SPDIF
USB USB2.0 Full Speed
SD MMC SD / miniSD / microSD / SDHC
Display information Number(Folder, File), Reproduction time, Name(Folder, File), Tag(Artist, Album, Title)
MP3 MPEG 1, 2, 2.5 LAYER 1, 2, 3
WMA WMA9 Standard
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 85
  • ・This LSI is an IC which integrates the WAV/AAC/WMA/MP3 decoder with built-in USB host
        interface, SD memory card interface, audio DAC, system control functions and
        internal CORE power supply regulator circuit.
    ・All the operations, from read of AAC/WMA/MP3/WAV files written in a memory device
        having the USB interface or a SD card to output of these to an audio system using
        KEY or I²C interface commands, are integrated in a single chip.
    ・The LSI supports external operations in stand-alone mode, which uses a command from
        the KEY input configured using the key matrix (hereinafter referred to as MODE1)
        and in slave mode, which uses a command from the master microcomputer using
        the built-in I²C interface (hereinafter referred to as MODE2). Select either MODE1
        or MODE2 at power ON.
    ・The LSI supports fast-forward and rewind playing functions.
    ・The LSI supports browsing function for other file name and direct select play while
        playing the current music. *This is available in MODE2 only.
    ・The LSI supports output of the information on folder names, file names, ID3TAG
        (V1.0, V.1,1, V2.2, V2.3, V2.4), WMA-TAG and AAC-TAG (iTunes, 3GP Meta-data)
        via the I²C slave interface. *This is available in MODE2 only.
    ・The LSI supports the audio line output, digital audio serial 3-line (I2S, EIAJ) output and
        digital audio interface (SPDIF) output.
    ・The IC allows reading from the specified file data within the memory. *This is available in
        MODE2 only.
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Application Note

Thermal Resistance