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FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
October 2007
FAN3800 — Mono / Stereo Audio Amplifier with
Microphone Pre-Amplifier and EMU Interface
Features
Regulated positive supply
Negative supply generator allows ground-centered
output swing
Dual speaker drivers with mono/stereo switch
capability
Capable of driving 16mW
RMS
per channel
Complete external microphone interface
Enhanced mini-USB bus detection and interface
circuitry
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
Description
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 16mW
RMS
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.
GND
SW1
CP1
CP2
VS
V+
Applications
One-piece stereo/mono headset with microphone
EMU to 3.5mm stereo headphone adapter
EMU to 2.5 or 3.5 adapter for stereo headset with
microphone
ID
MUTE
BYPASS
MIC+
MIC-
MICSUP
MICOUT
SPKLIN
SPKRIN
MICSW
GND
D-
CPOUT
V-
MLP-24
4x4mm
SPKLOUT
VS
SPKROUT
D+
Figure 1. FAN3800 Pin Out
Ordering Information
Part Number
FAN3800MLP24X
© 2007 Fairchild Semiconductor Corporation
FAN3800 • Rev. 1.0.0
Pb-Free
Package
24-Pin Molded Leadless Package (MLP)
Packing Method
Pack
www.fairchildsemi.com
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Block Diagram
V+
CP1
CP2
CPOUT
V-
V
pos
SPKLOUT
VS
2.5V
Suppl y
Vpos
MIC
BIAS
Neg Suppl y
V-
0dB
VS
V-
SPKLIN
VBUS
D-
D+
ID
GND
D+
R
mono
SPKRIN
V
pos
0dB
D-
D-
V
pos
SPKROUT
V-
BYPASS
R
stereo
MICBIAS
MICSUP
R
mic
ID Bias
SEND/END
N.O.
SW 1
MIC-
Rid
102k
Audi o
Removal
Filter
38dB
D-
MIC+
Bias
R
mic
MICOUT
GND
GND
MICSW
V+
MUTE
R
1
MUTE
R
2
Figure 2. Block Diagram
© 2007 Fairchild Semiconductor Corporation
FAN3800 • Rev. 1.0.0
www.fairchildsemi.com
2
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Pin Assignments
GND
SW1
CP1
CP2
VS
V+
ID
MUTE
BYPASS
MIC+
MIC-
MICSUP
SPKLIN
MICOUT
SPKRIN
GND
MICSW
D-
CPOUT
V-
MLP-24
4x4mm
SPKLOUT
VS
SPKROUT
D+
Figure 3. FAN3800 Pin Out
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Name
ID
MUTE
BYPASS
MIC+
MIC-
MICSUP
MICOUT
MICSW
GND
D-
SPKLIN
SPKRIN
D+
SPKROUT
VS
SPKLOUT
V-
CPOUT
CP2
CP1
VS
GND
V+
SW1
Type
Input
Input
Output
Input
Input
Output
Output
Input
Input
Input
Input
Input
Input
Output
Output
Input
Output
Input
Output
I/O
I/O
Input
Input
Output
Input
Identification pin
Microphone mute control input
Description
External 100nF capacitor used for pop/click suppression
High-side differential MIC input
Low-side differential MIC input
Microphone supply pin
Microphone amplifier output tap for setting gain and shifting the DC bias level
Output of microphone amplifier AC coupled to the D+ switch
IC ground
DC biased EMU bus input for send-end enable
Left audio channel input
Right audio channel input
DC biased EMU bus input for identification
Driven by MICOUT in mono mode
Right speaker driver output
Supply input from host device (3.3V typical)
Left speaker driver output
Filtered negative supply driven by CPOUT
Charge pump unfiltered output
Charge pump external cap pin
Charge pump external cap pin
Supply input from host device (3.3V typical)
IC ground
Positive power supply output for decoupling capacitor
Send-end switch input
© 2007 Fairchild Semiconductor Corporation
FAN3800 • Rev. 1.0.0
www.fairchildsemi.com
3
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol
V
S
V
I/O
T
J
T
STG
T
L
Supply Voltage
Parameter
Analog and Digital I/O
Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
Min.
-0.3
GND-0.3
-40
Max.
+6.0
V
CC
+0.3
+150
+80
+240
Unit
V
V
°C
°C
°C
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
V
S
T
A
Z
LOAD
V
IN D+/D-
V
BIAS D+/D
Θ
JA
Supply Voltage
Temperature Range
Parameter
Min.
2.7
-20
14
0
1.25
Typ.
3.3
27
32
Max.
4.5
60
V
S
Unit
V
°C
Ω
V
V
°C/W
Speaker Load Impedance
D+,D- ,SPKLIN,SPKRIN Input Range
D- / D+ Bias Level in Audio Mode
Package Thermal Resistance,
JEDEC Standard Multi-Layer Boards, Still Air
1.39
40
1.53
© 2007 Fairchild Semiconductor Corporation
FAN3800 • Rev. 1.0.0
www.fairchildsemi.com
4
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