VS1103b is a single-chip MIDI/ADPCM/WAV audio decoder and ADPCM encoder that can handle up to three simultaneous audio streams. It can also act as a MIDI synthesizer. VS1103B contains a high-performance, proprietary low-power DSP processor core VS DSP4, working data memory, 5 KiB instruction RAM and 0.5 KiB data RAM for user applications, serial control and input data interfaces, 4 general purpose I/O pins, an UART, as well as a high-quality variable-sample-rate mono ADC and stereo DAC, followed by an earphone amp and a common buffer.

VS1103b receives its input bitstreams through serial input buses, which it listens to as a system slave. The input streams are decoded and passed through digital volume controls to an 18-bit oversampling, multi-bit, sigma-delta DAC. Decoding is controlled via a serial control bus. In addition to basic decoding, it is possible to add application specific features, like DSP effects, to user RAM memory.

Available in a LQFP-48 pin 7x7x1.4mm package.

• Mixes three audio sources: General MIDI 1+ / SP-MIDI, WAV (PCM + IMA ADPCM), 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 to 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 30Ω 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 boot for special applications
• UART for debugging purposes
• New functions may be added with software and 4 GPIO pins

• 
  VLSI website
• VS1103B Datasheet