VS1005 – All-In-One MP3 Audio System-on-a-Chip

Block diagram


VS1005 product family is the new flagship and VLSI Solution's first MP3 system-on-a-chip.

The features of VS1005 are particularly suited for portable audio devices, docking stations, and portable recorder applications.

The Hi-speed USB (480 Mbit/s) host function is useful in systems that require audio playback capability from external media such as USB memory sticks or drives, opening up many new applications in AV receivers and radio players. USB slave mode is also supported.

The Ethernet interface provides Internet streaming capability over wired lines. I2S extends digital connectivity with other ICs. The RTC and battery backed registers provide alarm functions as well as very low power - low speed modes for the DSP.

The VS1005 SoC takes a new approach in application development when compared to VLSI's earlier products. The multitasking operating system VSOS and the object code library MegaLib offer services that can be utilized with VLSI Solution's Integrated Development Environment VSIDE. This combination makes writing applications to VS1005's 256 KiB RAM memory a straightforward and intuitive process. To further extend VS1005's usability, code can be loaded dynamically from any non-volatile memory, including VS1005's optional internal 1024 KiB flash memory. The internal flash memory can be protected, making it possible for developers and third parties to protect their code.

The MegaLib library includes all VLSI Solution's existing codecs: MP3 and Ogg Vorbis encoders, MP2, MP3, WMA, OGG, AAC LC, FLAC, IMA and WAV PCM decoders, and other functions: FM including RDS, file I/O, device drivers, application loading, multitasking, graphical interface functions, audio processing, etc.



  • Single power input
  • Internal voltage regulators
  • 3-input multiplexed SAR for monitoring
  • Optional battery for RTC and backup registers

Analog Audio

  • 2 x 24-bit / 96kHz DAC
  • 3 x 24-bit / 192kHz ADC
  • Integrated FM tuner with RDS, Japanese band included (76-108 MHz)
  • Stereo headphone output
  • Stereo microphone amplifier

Digital Audio

  • S/PDIF input and output (+AES/EBU support)
  • I2S input and output
  • 24-bit sample rate converter
  • High-speed USB slave or host
  • Ethernet interface


  • NAND flash interface
  • High speed SD card interface
  • Optional embedded flash
  • Internal SRAM (256 KiB) and ROM (256 KiB)

General Purpose I/O

  • Hi-Speed USB (480 Mbit/s) host / device
  • Resistive Touch Screen interface
  • JTAG interface for hardware debug
  • 8-bit bus for LCD
  • PWM output
  • UART
  • 2 SPI buses, host and slave mode supported

Other Hardware Features

  • Operates with a single clock
  • Optional real-time clock
  • Embedded flash memory can be copy protected
  • Power button pin, software-controlled power-off

VSOS Firmware and MegaLib Highlights

  • Programs are written using VLSI Solution's Integrated Development Environment VSIDE
  • Decoders: MP3, WMA, Ogg Vorbis, AAC LC, FLAC, WAV PCM
  • Encoders: MP3, Ogg Vorbis, WAV PCM
  • DSP audio features: EarSpeaker, Parametric EQ, VU Meter, Mixer, Speed Shifter, Pitch Shifter, etc
  • File I/O for SD cards and NAND flash.
  • FM tuner and RDS decoder
  • USB host and slave libraries
  • Graphical display with resistive touch speed control

Product variations

Device ID MP3 Encoder MP3 Decoder Embedded 8Mbit Flash
VS1005G-Q   X  
VS1005G-F-Q   X X
VS1205G-Q X X  
VS1205G-F-Q X X X
VS8005G-F-Q     X


VS1005 samples and developer board are available in VLSI's web store.

Small production quantities of VS1205G-F-Q can be ordered from our headquarters or distributors.

Please contact us for volume pricing.



LFGA88 10x10x0.8mm