Datasheet

VS1053b Datasheet
6 CONNECTION DIAGRAM, LQFP-48
The common buffer GBUF can be used for common voltage (1.23 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: 1.22, 2014-12-19 14