VS1053B Datasheet, PDF (17/79 Pages) List of Unclassifed Manufacturers – Ogg Vorbis/MP3/AAC/WMA/MIDI AUDIO CODEC

VLSI
Solution ^y
VS1053b preliminary
VS1053B
6. CONNECTION DIAGRAM, LQFP-48
The common buffer GBUF can be used for common voltage (1.24 V) for earphones. This will eliminate
the need for large isolation capacitors on line outputs, and thus the audio output pins from VS1053b may
be connected directly to the earphone connector.
GBUF must NOT be connected to ground under any circumstances. If GBUF is not used, LEFT and
RIGHT must be provided with coupling capacitors. To keep GBUF stable, you should always have the
resistor and capacitor even when GBUF is not used. See application notes for details.
Unused GPIO pins should have a pull-down resistor. Unused line and microphone inputs should not be
connected.
If UART is not used, RX should be connected to IOVDD and TX be unconnected.
Do not connect any external load to XTALO.
Version 0.5, 2007-12-03
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