FSA8049UCX Datasheet, PDF (1/5 Pages) Fairchild Semiconductor – Audio Jack Detection and Configuration, MIC / GND Cross Point Switch

April 2012
FSA8049
Audio Jack Detection and Configuration, MIC / GND
Cross Point Switch
Features
Detection
V_DD
THD (MIC)
ESD (IEC 61000-4-2)
(Air Gap)
Operating Temperature
Package
Top Mark
Ordering Information
Audio Plug GND & MIC Polarity
2.5 to 4.4V
0.002% Typical
15kV
-40°C to 85°C
9-Ball WLCSP 3x3 Array, 0.4mm
Terminal Pitch, 250µm Ball
M3
FSA8049UCX
Applications
 Cellular Phones, Smart Phones
 MP3 and Portable Multimedia Player
Description
The FSA8049 is an audio jack detection switch for 3- or
4-pole accessories. The FSA8049 detects the locations of
ground (GND) and microphone (MIC) poles on the audio
plug and automatically routes them to the appropriate
connections. This allows the end user to plug accessories,
such as headsets with different audio pole configurations,
into the mobile device and have them operate correctly.
 Detects 3- or 4-pole audio accessories
 Detects polarity of GND and MIC on 4-pole plugs
 Automatically routes GND and MIC to audio jack terminals
Related Resources
 For evaluation boards and questions, please contact:
[e-mail].
Typical Application
Baseband
Processor
GPIO
Audio
Sub System
MIC Bias
MIC
RMIC
CMIC
VDD
EN
Oscillator &
Logic
CEXT
Switch Enable
Timing
MIC
5Ω
Detection
To Audio Plug
Detection Circuit
Audio Jack
LSPKR
RSPKR
GND/MIC1
3Pole
4Pole
GND/MIC2
tOn/Off
Capacitor
GND
100mΩ
GNDA
Figure 1. Mobile Phone Example
© 2011 Fairchild Semiconductor Corporation
FSA8049 • Rev. 1.0.1
www.fairchildsemi.com