Preliminary Technical Data
FEATURES
4.72 mm × 3.76 mm × 1.0 mm surface mount package
High SNR: 62 dBA
High sensitivity: −37 dBV
Flat frequency response from 100 Hz to over 12 kHz
Low current consumption: <200 μA
Single-ended analog output
High PSRR: >50 dB
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant
Omnidirectional Microphone with
Bottom Port and Analog Output
ADMP401-1
GENERAL DESCRIPTION
The ADMP401-1 is a high quality, low cost, low power analog
output bottom-ported omnidirectional MEMS microphone.
The ADMP401-1 consists of a MEMS microphone element and
an output amplifier. The ADMP401-1 has a high SNR and high
sensitivity, making it an excellent choice for far field applications.
The ADMP401-1 has a flat wideband frequency response
resulting in natural sound with high intelligibility. Low current
consumption enables long battery life for portable applications.
A built-in particle filter provides for high reliability.
The ADMP401-1 is available in a thin 4.72 mm × 3.76 mm ×
1.0 mm surface mount package. The ADMP401-1 is reflow
solder compatible with no sensitivity degradation.
APPLICATIONS
Cell phones
PC audio
Digital cameras
Bluetooth headsets
FUNCTIONAL BLOCK DIAGRAM
MEMS
ASIC
BUFFER
MEMS
SIGNAL
–
OUTPUT
DRIVER
OUTPUT
+
V
DD
GND
MEMBRANE
BACKPLATE
REFERENCE VOLTAGE
BIAS CURRENT
MEMS
V
BIAS
FILTER
CHARGE
PUMP
GENERATOR
07712-001
Figure 1.
Rev. PrB
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
ADMP401-1
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ............................. 5
Preliminary Technical Data
Typical Performance Characteristics ..............................................6
Handling Instructions .......................................................................7
Pick-and-Place Equipment ..........................................................7
Reflow Solder .................................................................................7
Board Wash ....................................................................................7
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................8
Rev. PrB | Page 2 of
8
Preliminary Technical Data
SPECIFICATIONS
ADMP401-1
T
A
= 25°C, V
DD
= 1.8 V, unless otherwise noted. All minimum and maximum specifications are guaranteed. Typical specifications are not
guaranteed.
Table 1.
Parameter
PERFORMANCE
Directionality
Sensitivity
Signal-to-Noise Ratio
Equivalent Input Noise
Frequency Response
Total Harmonic Distortion
Power Supply Rejection Ratio
Maximum Acoustic Input
POWER SUPPLY
Supply Voltage
Supply Current
OUTPUT CHARACTERISTICS
Output Impedance
Polarity
1
Symbol
Test Conditions/Comments
Min
Typ
Omni
−37
62
32
0
0
Max
Unit
1 kHz, 94 dB SPL
SNR
EIN
100 Hz to 10 kHz
100 Hz to 12 kHz
105 dB SPL
217 Hz, 100 mV p-p square wave super-
imposed on V
DD
= 1.8 V
Peak
−40
60
−2
−3
50
−34
THD
PSRR
+2
+2
3
dBV
dBA
dBA SPL
dB
dB
%
dB
dB SPL
120
1.5
3.6
200
200
Noninverting
1
V
DD
I
S
Z
OUT
V
μA
Ω
Positive going (increasing) pressure on the membrane results in a positive going (increasing) output voltage.
Rev. PrB | Page 3 of
8
ADMP401-1
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Sound Pressure Level (SPL)
Mechanical Shock
Vibration
Temperature Range
Rating
3.6 V
160 dB
20,000
g
Per MIL-STD-883G
−40°C to +85°C
Preliminary Technical Data
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
CRITICAL ZONE
T
L
TO T
P
T
P
RAMP-UP
t
P
TEMPERATURE
T
L
T
SMAX
T
SMIN
t
L
t
S
PREHEAT
RAMP-DOWN
t
25°C TO PEAK
TIME
Figure 2. Recommended Soldering Profile
Table 3. Recommended Soldering Profile
Profile Feature
Average Ramp Rate (T
L
to T
P
)
Preheat
Minimum Temperature (T
SMIN
)
Maximum Temperature (T
SMAX
)
Time (T
SMIN
to T
SMAX
), t
S
Ramp-Up Rate (T
SMAX
to T
L
)
Time Maintained Above Liquidous (t
L
)
Liquidous Temperature (T
L
)
Peak Temperature (T
P
)
Time Within 5°C of Actual Peak Temperature (t
P
)
Ramp-Down Rate
Time 25°C to Peak Temperature
Sn63/Pb37
3°C/sec max
100°C
150°C
60 sec to 120 sec
3°C/sec
60 sec to 150 sec
183°C
240°C + 0°C/−5°C
10 sec to 30 sec
6°C/sec max
6 minute max
Pb-Free
3°C/sec max
150°C
200°C
60 sec to 120 sec
3°C/sec
60 sec to 150 sec
217°C
260°C + 0°C/−5°C
20 sec to 40 sec
6°C/sec max
8 minute max
Rev. PrB | Page 4 of
8
07712-002
Preliminary Technical Data
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
OUTPUT
1
ADMP401-1
GND
2
GND
GND
6
3
V
DD
5
4
GND
BOTTOM VIEW
(TERMINAL SIDE DOWN)
Not to Scale
007712-003
Figure 3. Pin Configuration (Bottom View)
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
Mnemonic
OUTPUT
GND
GND
GND
V
DD
GND
Description
Analog Output Signal.
Ground.
Ground.
Ground.
Power Supply.
Ground.
Rev. PrB | Page 5 of
8
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