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FSA321UMX Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part # FSA321UMX
Description  USB2.0 Hi-Speed (480Mbps) and Audio Switches with Negative Signal Capability and Built-in Termination on Unselected Audio Paths
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSA321UMX Datasheet(HTML) 3 Page - Fairchild Semiconductor

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© 2007 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSA321 • Rev.1.0.6
3
Functional Description
The FSA321 is a combined USB and audio switch that
enables sharing the D+/D- lines of a USB connector with
stereo audio CODEC outputs. The USB Sel pin has an
internal pull-down resistor that results in a default audio-
mode configuration. The switch can be configured for
auto USB detection by connecting the VBUS pin to the
USB Sel pin. The audio switch path also handles
negative signals, eliminating the need for large coupling
capacitors and greatly reducing the potential for audio
pop. Termination resistors on the audio R and L ports
are enabled when the switch is in USB mode, this also
helps reduce audio pop when enabling the audio path.
The FSA321 allows for an audio override state by
forcing A/LP Sel high when USB Sel is high. This is
useful for USB car kit applications or if the device is in a
cradle charger when “Send/End” is pressed.
Application Diagram
USB 2.0
Hi-Speed
Controller
Audio
CODEC
FSA321
D+
D-
R
L
D+/R
D-/L
USB Sel
VCC
0.1µF
Figure 3. Typical Application Diagram


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