March 2013

© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSA2000 • Rev. 1.0.0

FSA2000

Auto-Selecting HS-USB Switch with Cap-Free Headphone

Audio Amplifier

Features

Switch Type

USB + Headphone Amplifier

Switch Mechanism

USB Detection

YES

USB

USB 2.0 High Speed &

Full-Speed Compliant

Audio Amplifier

Class AB

Amplifier Output Power

Ω)

Amplifier Gain

0dB

THD+N

0.1%

SNR

-90dB

PSRR

-95dB

2.7 to 4.3V

3mA

6µA

Package

16- Lead UMLP 1.80 x 2.60 x

0.55mm, 0.40mm pitch

Ordering Information

FSA2000UMX

Applications

Description

The FSA2000 is a low-cost integrated HS-USB and audio

switch that incorporates an audio headphone amplifier. This

solution eliminates many of the discrete parts currently used

in stereo headset applications. It provides stereo headphone

drivers designed to operate with a ground-centered output

signal. This allows for the removal of large and expensive

DC blocking capacitors. The headphone drivers are capable

Related Resources

Reduce Audio “Click” and “Pop”

contact: Analog.Switch@fairchildsemi.com.

Typical Application

Figure 1. Mobile Phone Example

D+

D-

0.1µF

OR

0.1µF

V-

V+

+

-

V-

V+

+

-

R

L

D+/ R

D-/ L

Headphone

Amplifiers

FS / HS USB

32

Ω

32

Ω

USB Data

Cable

Auto Switches to USB

when V

Audio

Subsystem

USB TX

Eliminates large

220µF capacitors