Features
 Decodes
Ogg Vorbis;
MP3 = MPEG 1 & 2 audio layer III (CBR
+VBR +ABR);
MP1/MP2 = layers I & II optional;
MPEG4/ 2 AAC-LC(+PNS),
HE-AAC v2 (Level 3) (SBR + PS);
WMA 4.0/4.1/7/8/9 all profiles (5-384 kbps);
General MIDI 1 / SP-MIDI format 0 files;
FLAC with software plugin;
WAV (PCM + IMA ADPCM)
 Encodes Ogg Vorbis w/ software plugin
 Encodes stereo IMA ADPCM / PCM
 Streaming support for MP3 and WAV
 EarSpeaker Spatial Processing
 Bass and treble controls
 Operates with a single 12..13MHz clock
 Can also be used with a 24..26MHz clock
 Internal PLL clock multiplier
 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
load
 Quiet power-on and power-off
 I2S output interface for external DAC
 Separate voltages for analog, digital, I/O
 On-chip RAM for user code and 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 up to 8 GPIO pins
 Lead-free RoHS-compliant package

Description
VS1053b is an Ogg Vorbis/MP3/AAC/WMA/
FLAC/WAVMIDI audio decoder as well as an
PCM/IMA ADPCM/Ogg Vorbis encoder on a
single chip. It contains a high-performance,
proprietary low-power DSP processor core
VS_DSP4, data memory, 16 KiB instruction
RAM and 0.5+ KiB data RAM for user applications
running simultaneously with any builtin
decoder, serial control and input data interfaces,
up to 8 general purpose I/O pins,
an UART, as well as a high-quality variablesample-
rate stereo ADC (mic, line, line + mic
or 2line) and stereo DAC, followed by an
earphone amplifier and a common voltage buffer.
VS1053b receives its input bitstream through
a serial input bus, which it listens to as a
system slave. The input stream is decoded
and passed through a digital volume control
to an 18-bit oversampling, multi-bit, sigmadelta
DAC. The decoding is controlled via a
serial control bus. In addition to the basic decoding,
it is possible to add application specific
features, like DSP effects, to the user
RAM memory.
Optional factory-programmable unique chip
ID provides basis for digital rights management
or unit identification features.