VS1003B

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 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