USB Audio Decoder ICs - BU94603KV

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.

Evaluation Board
* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part Number
Unit Quantity
Minimum Package Quantity
Packing Type
BU94603KV-E2 Active VQFP64 1000 1000 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
  • ・BU94603KV is AAC+WMA+MP3 decoder IC in which a USB host I/F, SD memory card I/F,
        audio DAC and system control functions are built. Using a KEY or I²C interface
        command, the IC reads out a MP3 file written to a memory device having a USB I/F
        or a SD memory card. All the operations required before the data can be output to
        audio devices are incorporated into one chip.
    ・BU94603KV supports STAND ALONE MODE which is enabled by commands entered
        from the keyboard (hereinafter referred to as MODE1), AUTO SLAVE MODE which
        is enabled by commands entered from the master microcomputer, same as those
        entered from the keyboard, via the built-in I²C interface (hereinafter referred to as
        MODE2) and MANUAL SLAVE MODE which can send the memory device
        information to the master microcomputer via the I²C interface and completely
        control sequences such as a play sequence by the master microcomputer
        (hereinafter referred to as MODE3).
    ・BU94603KV supports fast forward playing and fast backward playing with music.
    ・BU94603KV outputs folder names, file names, ID3TAG (V1.0, V1.1 V2.2 V2.3 and V2.4)
        information and WMA-TAG information and AAC-TAG(iTunes Meta-data)
        information via the I²C interface. This function is enabled only in MODE 2 and
        MODE 3.
    ・BU94603KV supports audio line output, audio serial three-line (I2S) output and digital
        audio interface (SPDIF) output.
    ・Reading a specified file data is possible from USB memory. *Only a file that exists in root
        folder corresponds.
Other New/Updated Products Relating to Audio & Video
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BU94601KV USB Audio Decoder ICs VQFP64   Buy Sample
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BU94605AKV USB Audio Decoder ICs VQFP80   Buy Sample
BU94607AKV USB Audio Decoder ICs VQFP80   Buy Sample
New Products:
Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.