USB Audio Decoder ICs - BU94604BKV

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
BU94604BKV-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
iPod iPod 5G/iPod nano/iPod classic/iPod touch/iPhone/iPad
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
  • ・BU94604KV 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.
    ・BU94604KV 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 C60 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).
    ・I²C bus ⇔ USB protocol conversion function built into. Only MODE2 or MODE3
    ・BU94604KV supports fast forward playing and fast backward playing with music.
    ・BU94604KV 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.
    ・BU94604KV 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
PART NUMBER Product Name Package Datasheet Distribution Inventory
BU94502CKS2 AAC/WMA/MP3 + SD Memory Card + iPod SQFP-T52   Buy Sample
BU94502CMUV AAC/WMA/MP3 + SD Memory Card + iPod VQFN040V6060   Buy Sample
BU94601KV USB Audio Decoder ICs VQFP64   Buy Sample
BU94603KV USB Audio Decoder ICs VQFP64   Buy Sample
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.