The VS1003 is a 48 pin LQFP package 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

Features:

• 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

Datasheet VS1003

VLSI Website