FAN3800 — Mono / Stereo Audio Amplifier with
Microphone Pre-Amplifier and EMU Interface
Regulated positive supply
Negative supply generator allows ground-centered
Dual speaker drivers with mono/stereo switch
Capable of driving 16mWRMS per channel
Complete external microphone interface
Enhanced mini-USB bus detection and interface
Manual and remote send-end switch interface
Pop and click suppression
Single 2.7V to 4.5V operation
2kV ESD (HBM) protection
MLP 24-pin package
One-piece stereo/mono headset with microphone
EMU to 3.5mm stereo headphone adapter
www.DataSheet4EUM.coUmto 2.5 or 3.5 adapter for stereo headset with
The FAN3800 is a low-cost solution that integrates the
many discrete parts currently used in stereo headset
applications. It provides mono / stereo speaker drivers
and a complete microphone interface. Additionally, the
FAN3800 allows headset detection and identification
through a 5-pin, enhanced mini-USB (EMU) bus.
Manual and remote send-end switching is supported.
The FAN3800 speaker drivers are designed to operate
with a ground-centered output signal. This allows
removal of large and expensive DC blocking capacitors.
In addition, it allows interfacing with externally powered
speakers. The speaker drivers are capable of driving up
to 16mWRMS per channel.
FAN3800 delivers a complete solution for interfacing an
external microphone. The microphone interface
provides a regulated, high PSRR supply, differential
input sense to single-ended output driver amplifiers,
and output muting. Gain is fixed at 36dB and can be
attenuated externally with a resistor divider network.
Send-end switching automatically routes the
microphone output to the D+ output. When activated,
the speakers switch from stereo to mono mode, both
driven by the D- input. Pop and click noise is minimized
during switching. Send-end information can be
generated manually through an external switch or
through the EMU bus interface.
© 2007 Fairchild Semiconductor Corporation
FAN3800 • Rev. 1.0.0
Figure 1. FAN3800 Pin Out
24-Pin Molded Leadless Package (MLP)