Bottom Port Analog Silicon Microphone

Pre-Production

This document contains information for a product under

development. Cirrus Logic reserves the right to modify this

product.

http://www.cirrus.com

Copyright

 Cirrus Logic, Inc., 2014–2016

(All Rights Reserved)

Rev 3.2

APR

‘16

WM7331E

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

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

CMOS MEMS Transducer

VDD

CHARGE

PUMP

GND

WM7331

AMP

OUTPUT

3D VIEW

2.50mm x 1.60mm x 0.90mm LGA package