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Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

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Description: The VS1003 from VLSI is a single-chip MP3/WMA/MIDI audio decoder and ADPCM encoder. Central to the IC is a high-performance, low-power DSP processor core VS DSP4. It’s loaded with features: working data memory, 5kB instruction RAM and 0.5kB data RAM for user applications, serial control and input data interfaces, 4 general purpose I/O pins, a UART. Also, a high-quality, variable-sample-rate, mono ADC and stereo DAC, followed by an earphone amplifier and a ground buffer

Comes in an LQFP-48 pin package.


  • Decodes:
    • MPEG 1 & 2 audio layer III (CBR +VBR +ABR)
    • WMA 4.0/4.1/7/8/9 all profiles (5-384kbit/s)
    • WAV (PCM + IMA ADPCM);General MIDI / SP-MIDI files
  • Encodes IMA ADPCM from microphone or line input
  • Streaming support
  • Bass and treble controls
  • Operates with a single 12 - 13 MHz or 24 - 26MHz clock
  • Internal PLL clock multiplier
  • Low-power operation
  • High-quality, on-chip, stereo DAC with no phase error between channels
  • Stereo earphone driver capable of driving a 30­ ohm load
  • Separate operating voltages for analog, digital and I/O
  • 5.5kB On-chip RAM for user code / data
    • 5kB instruction RAM
    • 0.5kB user data RAM
  • Serial control and data interfaces
  • Can be used as a slave co-processor
  • SPI flash boot for special applications
  • UART for debugging purposes
  • New functions may be added with software and 4 GPIO pins


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