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WM7331E
Bottom Port Analog Silicon Microphone
DESCRIPTION
The WM7331 is a low-profile silicon analog microphone. It
offers high Signal to Noise Ratio (SNR) and low power
consumption and is suited to a wide variety of consumer
applications.
The WM7331 incorporates Cirrus Logic® proprietary
CMOS/MEMS membrane technology, offering high reliability
and high performance in a miniature, low-profile package.
The compact integration of transducer and internal circuitry
on a single die enables implementation within an extremely
small package size.
The WM7331 is designed to withstand the high
temperatures associated with automated flow solder
assembly processes. (Note that conventional microphones
can be damaged by this process.)
The WM7331 offers tight tolerance on the microphone
sensitivity, giving reduced variation between parts. This
removes the need for in-line production calibration of part-to-
part microphone variations.
FEATURES
High SNR (63dB)
Low variation in sensitivity (±1dB tolerance)
Low current consumption (55µA)
Analog output
Bottom Port LGA Package
2.5mm x 1.6mm x 0.9mm package
1.6V to 3.6V supply
APPLICATIONS
Mobile phone handsets
Wearable devices
Portable media players
Digital cameras
BLOCK DIAGRAM
VDD
WM7331
3D VIEW
CHARGE
PUMP
CMOS MEMS Transducer
AMP
OUTPUT
2.50mm x 1.60mm x 0.90mm LGA package
GND
Pre-Production
http://www.cirrus.com
This document contains information for a product under
development. Cirrus Logic reserves the right to modify this
product.
Copyright Cirrus Logic, Inc., 20142016
(All Rights Reserved)
Rev 3.2
APR ‘16

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TABLE OF CONTENTS
WM7331E
DESCRIPTION................................................................................................................ 1
FEATURES..................................................................................................................... 1
APPLICATIONS ............................................................................................................. 1
BLOCK DIAGRAM ......................................................................................................... 1
3D VIEW ......................................................................................................................... 1
TABLE OF CONTENTS.................................................................................................. 2
PIN CONFIGURATION ................................................................................................... 3
PIN DESCRIPTION......................................................................................................... 3
ORDERING INFORMATION........................................................................................... 3
ABSOLUTE MAXIMUM RATINGS ................................................................................. 4
IMPORTANT ASSEMBLY GUIDELINES ....................................................................... 4
RECOMMENDED OPERATING CONDITIONS.............................................................. 4
ACOUSTIC AND ELECTRICAL CHARACTERISTICS .................................................. 5
TERMINOLOGY .........................................................................................................................5
TYPICAL PERFORMANCE............................................................................................ 6
APPLICATIONS INFORMATION ................................................................................... 7
RECOMMENDED EXTERNAL COMPONENTS........................................................................7
CONNECTION TO A CIRRUS LOGIC CODEC .........................................................................8
PCB LAND PATTERN AND PASTE STENCIL ..........................................................................9
PACKAGE DIMENSIONS............................................................................................. 10
IMPORTANT NOTICE .................................................................................................. 11
REVISION HISTORY .................................................................................................... 12
2 Rev 3.2

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PIN CONFIGURATION
3
WM7331E
4
12
Top View
PIN DESCRIPTION
PIN NAME
1 VDD
2 OUTPUT
3 GND
4 GND
TYPE
Supply
Analog Output
Supply
DESCRIPTION
Analog supply
Microphone analog output signal
Analog ground
Can be left floating (recommended), or connected to GND
ORDERING INFORMATION
ORDER CODE
TEMPERATURE
RANGE
WM7331IMSE/RV
-40 to +100°C
Note:
Reel quantity = 6000
All devices are Pb-free and Halogen free.
PACKAGE
LGA
(tape and reel)
MOISTURE
PEAK SOLDERING
SENSITIVITY LEVEL TEMPERATURE
MSL2A
+260°C
Rev 3.2
3

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WM7331E
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Cirrus Logic tests its package types according to IPC/JEDEC J-STD-020 for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL2A = out of bag storage for 4 weeks at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
MIN MAX
Supply Voltage (VDD)
Operating temperature range, TA
Storage temperature prior to soldering
Storage temperature after soldering
-0.3V
+4.2V
-40°C
+100°C
30°C max / 60% RH max
-40°C
+100°C
IMPORTANT ASSEMBLY GUIDELINES
Do not put a vacuum over the port hole of the microphone. Placing a vacuum over the port hole can damage the device.
Do not board wash the microphone after a re-flow process. Board washing and the associated cleaning agents can damage the
device. Do not expose to ultrasonic cleaning methods.
Do not use a vapour phase re-flow process. The vapour can damage the device.
Please refer to application note WAN0273 (MEMS MIC Assembly and Handling Guidelines) for further assembly and handling
guidelines.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Analog Supply Range
Ground
SYMBOL
VDD
GND
MIN
1.6
TYP
1.8
0
MAX
3.6
UNIT
V
V
4 Rev 3.2

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WM7331E
ACOUSTIC AND ELECTRICAL CHARACTERISTICS
Test Conditions: VDD=1.8V, 1kHz test signal, TA = 25°C, unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
Directivity
Polarity
Positive sound pressure
Sensitivity
S 94dB SPL
Acoustic Overload
No Load, THD < 10%
Total Harmonic Distortion
THD
94dB SPL
114dB SPL
120dB SPL
Signal to Noise Ratio
SNR
A-weighted
Dynamic Range
DR A-weighted
Frequency Response
-3dB low frequency
+3dB high frequency
Frequency Response Flatness
200Hz to 8kHz
Part-to-Part Phase Matching
80Hz to 100Hz
200Hz
Acoustic Noise Floor
A-weighted
Electrical Noise Floor
A-weighted
Power Supply Rejection Ratio
PSRR
217Hz sine wave,
100mV (peak-peak)
Power Supply Rejection
PSR
217Hz square wave,
100mV (peak-peak)
Current Consumption
Output DC Impedance
IVDD
ZOUT
MIN TYP MAX
Omni-directional
Positive output voltage
-39 -38 -37
124
0.04
0.3
1
63
89
70 100
15000
-1 +1
±10
±5
31
-101
62
-88
55 60
200 400
UNIT
dBV
dB SPL
%
dB
dB
Hz
dB
°
dB SPL
dBV
dB
dBV
µA
Ω
TERMINOLOGY
1. Sensitivity (dBV) - Sensitivity is a measure of the microphone output response to the acoustic pressure of a 1kHz 94dB SPL
(1Pa RMS) sine wave.
2. Total Harmonic Distortion (%) THD is the ratio of the RMS sum of the harmonic distortion products in the specified bandwidth
(see note below) relative to the amplitude of the fundamental (ie. test frequency) output.
3. Signal-to-Noise Ratio (dB) SNR is a measure of the difference in level between the output response of a 1kHz 94dB SPL
sine wave and the idle noise output.
4. Dynamic Range (dB) DR is the ratio of the 1% THD microphone output level (in response to a sine wave input) and the idle
noise output level.
5. All performance measurements are carried out within a 20Hz to 20kHz bandwidth and, where noted, an A-weighted filter.
Failure to use these filters will result in higher THD and lower SNR values than are found in the Acoustic and Electrical
Characteristics. The low pass filter removes out of band noise.
Rev 3.2
5