VS1003-MP3 / WMA / MIDI Audio Codec Circuit 
DataSheet
Introduction
VS1003 is a versatile slave MP3 and WMA decoder chip, replacing the discontinued VS1002. It can record wideband speech quality audio and play MIDI either from files or using a standard serial MIDI keyboard with the Real-Time MIDI Input Application. Many wide-ranging applications have been developed for this IC that has sold more than 5 million units.
Features
- Decodes MP3 (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
- 5.5 KiB On-chip RAM for user code / data
- 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