Document
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-topart 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., 2014–2016 (All Rights Reserved)
Rev 3.2 APR ‘16
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
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
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 und.