VS1103 - MIDI / ADPCM Audio Codec Circuit

Block diagram


  • Mixes three audio sources
    • General MIDI 1+ / SP-MIDI
    • Microphone or line input
  • Encodes IMA ADPCM from microphone line input or mixed output
  • Input streams can use different sample rates
  • EarSpeaker Spatial Processing
  • 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


LQFP48 7x7x1.4mm