Features

• Encodes a multitude of audio formats, all at 8-48 kHz, mono and stereo:
  • MP3: All samplerates and bitrates of MPEG 1.0, 2.0 and 2.5
  • Ogg Vorbis
  • 16-bit PCM
  • IMA ADPCM
  • G.711 u-law and A-law
  • G.722 ADPCM
• Decodes multiple formats upto 48 kHz:
  • MP3 = MPEG 1 & 2 audio layer III (CBR+VBR+ABR)
  • MP2 = MPEG 1 & 2 audio layer II optional
  • Ogg Vorbis
  • MPEG4 / 2 AAC-LC(+PNS), HE-AAC v2 (Level 3) (SBR + PS)
  • WMA4.0/4.1/7/8/9 all profiles (5-384 kbps)
  • FLAC lossless audio (upto 24 bits)
  • WAV: 16-bit PCM, IMA ADPCM, G.711 u-law and A-law, G.722 ADPCM
• A new full-duplex codec mode allows both input and output using many formats:
  • 16-bit PCM
  • IMA ADPCM
  • G.711 u-law and A-law
  • G.722 ADPCM
• Streaming support
• Upto 96 KiB RAM for user code and data
• I2S interface for external DAC
• High-quality stereo A/D converter
• Serial control and data interfaces
• Can be used either as a slave co-processor or as a standalone processor
• UART for debugging purposes
• New functions may be added with software and 12 GPIO pins
• EarSpeaker Spatial Processing
• Bass and treble controls
• 5-channel equalizer
• Low-power operation
• High-quality on-chip stereo DAC with no phase error between channels
• Zero-cross detection for smooth volume change
• Stereo earphone driver capable of driving a 30­-ohm load
• Quiet power-on and power-off
• Separate voltages for analog, digital, I/O
• SPI flash boot for special applications
• Hardware drop-in replacement for VS1053 (control software still needs to be modified)

For more information see the VS1063 product page

If you don't require mp3 encoding (only decoding), also consider VS1163A-L below.