BU94705AKV is a MP3 encoder + WAV/AAC/WMA/MP3 decoder IC which contains program download function from external serial Flash ROM and contains USB host, SD card I/F, CD-ROM I/F, audio DAC, system controller, regulator for internal CORE power supply.
The BU94705AKV is an audio decoder IC that integrates USB host, SD‑card interface, CD‑ROM interface, MP3/AAC/WMA decoding, audio DAC and system controller. It supports both stand‑alone and slave operation modes and includes functions such as FAT file‑system handling, ID3 tag analysis, and digital audio outputs (S/PDIF, I2S).
The document provides absolute maximum ratings, operating conditions, detailed pin descriptions, block diagrams, and I/O signal specifications. It also outlines usage notes, licensing requirements for Apple devices, and safety/legal notices.
| Supply voltage (Analog, I/O) range | -0.3 V to 4.5 V |
|---|---|
| Input voltage VIN range | -0.3 V to VDD1+0.3 V |
| Storage temperature range | -55 °C to 125 °C |
| Operating temperature range | -40 °C to 85 °C |
| Power dissipation (25 °C) | 900 mW |
| Clock frequency (XIN_PLL / XOUT_PLL) | 16.9344 MHz |
| Reset input minimum pulse width | 100 µs |
| USB2.0 Full Speed host support | Yes |
| Audio DAC THD (1 kHz sine) | 0.005 % |
| Audio DAC dynamic range | 90 dB |
The analog I/O pins operate from –0.3 V up to 4.5 V.
The device can dissipate up to 900 mW when the ambient temperature is 25 °C.
The PLL uses a 16.9344 MHz crystal for both input and output.
Set the SEL_SLAVE pin high for stand‑alone mode (MODE1) or low for slave mode (MODE2) at power‑on; the selection cannot be changed after power‑on.