FSA850 Datasheet, PDF (1/3 Pages) Fairchild Semiconductor – Audio 3-Pole / 4-Pole MIC-GND Switch

August 2012
FSA850
Audio 3-Pole / 4-Pole MIC-GND Switch
Features
Switch Type
V_CC
THD (MIC)
ESD
IEC 61000-4-2 (Air Gap)
IEC 61000-4-2 (Contact)
HBM (All Pins)
GNDnA/GNDnB to GND
Power to GND
CDM
Operating Temperature
R_ON Maximum (GND1n)
R_ON Maximum (SENSE)
3-Pole/4-Pole MIC - GND
2.3 to 4.5 V
0.001% Typical
15 kV
8 kV
3 kV
8 kV
10 kV
2 kV
-40°C to 85°C
0.08 Ω
1Ω
Applications
 3.5 mm and 2.5 mm Audio Jacks
 Cellular Phones, Smart Phones
 MP3 and PMP (Portable Media Player)
Typical Application
Description
The FSA850 is a 3-pole or 4-pole audio jack microphone
GND switch for accessories with General-Purpose Input /
Output (GPIO) control signals. The FSA850 also has the
ability to perform 4-pole cross-point switching to support
Open Mobile Terminal Platform (OMTP) 4-pole headset
plugs. The architecture is designed to replace discrete
MOSFET solutions and allow common third-party
headphones to be used for listening to music or playing
video from mobile handsets, personal media players, and
portable peripheral devices.
 Supports 4-Pole OMTP Cross Point Switching for GND
Connection
 Integrates a MIC switch for 3- or 4-Pole Configuration
Headset Plugs
 Reduces “Pop and Click” Caused by Microphone Bias
Related Resources
 For samples and questions, please contact:
[e-mail].
© 2011 Fairchild Semiconductor Corporation
FSA850 • Rev. 1.0.0
Figure 1. Typical Mobile Application
www.fairchildsemi.com