Features

 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. . . 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

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

Description

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 VS_DSP4, a high-performance,

proprietary low-power DSP processor

core, 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, a UART,

as well as a high-quality variable-sample-rate

mono ADC and stereo DAC, followed by an

earphone amplifier 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.