October 2007
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
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 16mWRMS 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
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
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 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.
ID
MUTE
BYPASS
MIC+
MIC-
MICSUP
CPOUT
V-
SPKLOUT
VS
SPKROUT
D+
MLP-24
4x4mm
SW1
V+
GND
VS
CP1
CP2
MICOUT
MICSW
GND
D-
SPKLIN
SPKRIN
Figure 1. FAN3800 Pin Out
Ordering Information
Part Number Pb-Free Package Packing Method
FAN3800MLP24X 24-Pin Molded Leadless Package (MLP) Pack
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 2
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Block Diagram
SPKROUT
SPKLOUT
MIC+
MIC-
SEND/END
N.O.
VS
2.5V
Suppl y
SPKLIN
D+
ID
GND
Bias
Bias
V
pos
V-
V
pos
V-
Neg Suppl y
Audio
Removal
Filter
V
pos
SW1
V+ CP1 CP2
MICOUT
MICSW
V-
D-
VBUS
D-
D+
ID
GND
Rid
102k
SPKRIN
R
stereo
MUTE
CPOUT
Vpos
MIC
BIAS
V-
MICBIAS
0dB
0dB
38dB
D-
D-
R
1
R
2
R
mono
V+
MUTE
GND
R
mic
MICSUP
R
mic
BYPASS
VS
Figure 2. Block Diagram
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 3
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Pin Assignments
ID
MUTE
BYPASS
MIC+
MIC-
MICSUP
CPOUT
V-
SPKLOUT
VS
SPKROUT
D+
MLP-24
4x4mm
SW1
V+
GND
VS
CP1
CP2
MICOUT
MICSW
GND
D-
SPKLIN
SPKRIN
Figure 3. FAN3800 Pin Out
Pin Definitions
Pin # Name Type Description
1 ID Input Identification pin
2 MUTE Input Microphone mute control input
3 BYPASS Output External 100nF capacitor used for pop/click suppression
4 MIC+ Input High-side differential MIC input
5 MIC- Input Low-side differential MIC input
6 MICSUP Output Microphone supply pin
7 MICOUT Output Microphone amplifier output tap for setting gain and shifting the DC bias level
8 MICSW Input Output of microphone amplifier AC coupled to the D+ switch
9 GND Input IC ground
10 D- Input DC biased EMU bus input for send-end enable
11 SPKLIN Input Left audio channel input
12 SPKRIN Input Right audio channel input
Input DC biased EMU bus input for identification
13 D+
Output Driven by MICOUT in mono mode
14 SPKROUT Output Right speaker driver output
15 VS Input Supply input from host device (3.3V typical)
16 SPKLOUT Output Left speaker driver output
17 V- Input Filtered negative supply driven by CPOUT
18 CPOUT Output Charge pump unfiltered output
19 CP2 I/O Charge pump external cap pin
20 CP1 I/O Charge pump external cap pin
21 VS Input Supply input from host device (3.3V typical)
22 GND Input IC ground
23 V+ Output Positive power supply output for decoupling capacitor
24 SW1 Input Send-end switch input
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 4
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 Parameter Min. Max. Unit
VS Supply Voltage -0.3 +6.0 V
VI/O Analog and Digital I/O GND-0.3 VCC+0.3 V
TJ Junction Temperature +150 °C
TSTG Storage Temperature Range -40 +80 °C
TL Lead Temperature (Soldering, 10 seconds) +240 °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 Parameter Min. Typ. Max. Unit
VS Supply Voltage 2.7 3.3 4.5 V
TA Temperature Range -20 27 60 °C
ZLOAD Speaker Load Impedance 14 32
VIN D+/D- D+,D- ,SPKLIN,SPKRIN Input Range 0 VS V
VBIAS D+/D D- / D+ Bias Level in Audio Mode 1.25 1.39 1.53 V
ΘJA Package Thermal Resistance,
JEDEC Standard Multi-Layer Boards, Still Air 40
°C/W
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 5
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Electrical Characteristics
TA = 25°C, VS = 3.0V, audio inputs at -6dBV and AC coupled with 1µF, speaker outputs DC coupled into 16 loads
referenced to 1kHz, ID = VIL, CBYPASS = 100nF, unless otherwise noted.
Symbol Parameter Conditions Min. Typ. Max. Units
Power Supply Characteristics
IS Supply Current(1) No load 5.6 6.0 mA
tSUPPLY Power-Up Stabilization Time V+, V- within 90% of final value 10 ms
PSRRMIC Power Supply Noise Rejection at
MIC Output
217Hz 12% duty cycle square wave
2.7V to 3.2V at VS
Output (D+) in Vrms as single wideband
measurement within psophometric filter
-80 dBV(p)
PSRRSPKR Power Supply Noise Rejection at
Speaker Output
217Hz 12% duty cycle square wave
2.7V to 3.2V at VS
Output (D+) in Vrms as single wideband
noise measurement within 20Hz –
20kHz, A weighted
-80 dBV(a)
VMIC Microphone Bias Supply(1) Supply current = 1mA 2.0 2.1 2.2 V
D+/D- Line Characteristi cs
VOH D+ Output High Voltage D+(1) During detection, mono mode (external
150k ± 30% D+ pull-up to 2.775V 3% 2.0 V
VOL D+ Output Low Voltage D+ (1) During detection, stereo mode (external
150k ± 30% D+ pull-up to 2.775V 3% 0.8 V
VOL D- Output Low Voltage D-(1) During detection (external 4M pull-down
to GND) 0.8 V
VEN LOW D- Voltage to Disable MFB(1) Multi-function button disabled 0.5 V
VEN HIGH D- Voltage to Enable MFB(1) Multi-function button enabled 1.0 V
ID Line Characteristics
VOH Output High Voltage(1) Send-end active, 102k pull-down
resistor 0.8 V
VOL Output Low Voltage(1) Send -end Active, 102k pull-down
resistor 0.2 V
VIH Input High Voltage – Stereo Mode(1) Voltage divider from phone and external
102k pull-down resistors 1.4 V
VIL Input Low Voltage – Mono Mode(1) Voltage divider from phone and external
102k pull-down resistors 1.0 V
IIN Input Leakage Current(2) Send-end inactive 100 nA
Input/Output Impedance
ZiD- D- Input Impedance(1) D-, mono mode; D-, stereo mode 33 k
ZiD+ D+ Input Impedance(1) D+, stereo mode 33 k
ZOD+ D+ Output Impedance(2) D+, mono mode 200
Zi MICSUP MICSUP input Impedance(2) V
S = 0 200 k
ZL D+ Maximum Load Impedance on D+(2) Mono mode 300 pF
ZL SPKR Maximum Load Impedance on
SPKROUT & SPKLOUT(2) Stereo or mono mode 1 nF
Mute Input
VIH Input High Voltage(1) Mute-line floating 1.5 V
VIL Input Low Voltage(1) 0.8 V
Continued on the following page…
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 6
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Electrical Characteristics (Continued)
TA = 25°C, VS = 3.0V, audio inputs at -6dBV and AC coupled with 1µF, speaker outputs DC coupled into 16 loads
referenced to 1kHz, ID = VIL, CBYPASS = 100nF, unless otherwise noted.
Symbol Parameter Conditions Min. Typ. Max. Units
Microphone Pre-Amplifier
AMIC Gain(1) 1kHz, no divider on MICOUT, Input = -58dBV 37.5 38.0 38.5 dB
20Hz to 100Hz -3.0 0.5 dB
FRMIC Frequency Response(1)
Input = -58dBV, no
divider on MICOUT,
referenced to 1kHz 100Hz to 20kHz -0.5 0.5
THDMIC Distortion(2) Input = -44dBV at 1kHz
Microphone output resistors, R1 = R2 = 800 -65
dB
SINAD
NOISEMIC Idle Noise(2) Input loaded with 2 through 1µF cap.
Psophometric weighted output -80 dBVp
Speaker Amplifier
ASPK Gain(1) Input = -26dBV at 1kHz, 16 loads -0.5 0 0.5 dB
20Hz to 15kHz
referenced to 1kHz -1.5 1.5 dB
FRSPK Frequency Response(1) Input = -26dBV 15kHz to 20kHz
referenced to 1kHz -0.5 0.5
THDSPK Distortion(2) Input = -6dBV at 1kHz -65 dB
SINAD
NOISESPK Idle Noise(2) No input -75 dBV(A)
XTLKMS Microphone to Speaker
Crosstalk(2)
Input at microphone to give D+ = -6dBV,
measure at speaker output -65 dB
XTLKSM Speaker to Microphone
Crosstalk(2) D- = -6dBV, measure at D+ -65 dB
AMATCH Matching of L & R
Channels(2) Input = -26dBV, 20Hz to 20kHz 0.5 dB
XTLKSPK Crosstalk Between L & R
Channel(2) Input = -26dBV -65 dB
Notes:
1. 100% tested at TA = 25°C.
2. Guaranteed by design and characterization.
3. Microphone path noise measured using psophometric weighting function (see Figure 4).
4. Speaker path noise measured using A-type weighting.
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 7
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Typical Characteristics
MIC Path Psophometric Weighti ng
-96
-86
-76
-66
-56
-46
-36
-26
-16
-6
4
10 100 1000 10000
Freque ncy (Hz)
Relati v e G a in (dB)
Hi Limit Gain (dB) Low Limit
Figure 4. Microphone Path Psophometric Weighting Function
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 8
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
Physical Dimensions
Figure 5. 24-Pin Molded Leadless Package (MLP)
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN3800 • Rev. 1.0.0 9
FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface
