Top Port Analog Silicon Microphone

http://www.cirrus.com

Copyright

 Cirrus Logic, Inc., 2014–2016

(All Rights Reserved)

Rev 4.1

MAR

‘16

WM7121PE

DESCRIPTION

The WM7121P 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 WM7121P

incorporates

CMOS/MEMS membrane technology, offering high reliability

and high performance in a miniature, low-profile package.

The

WM7121P

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 WM7121P Top Port microphone offers matched

performance to the WM7132P Bottom Port microphone. The

matched characteristics enable highly accurate sound pick-

up in opposite directions, suitable for noise cancellation and

other DSP algorithms.

The WM7121P 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 (65dB)



Low variation in sensitivity (±1dB tolerance)



Matched pair with Bottom Port microphone WM7132P

-

Matched sensitivity, roll-off, and phase response



Low current consumption (190µA)



Analog output



Top Port LGA Package



1.5V to 3.7V supply

APPLICATIONS



Mobile phone handsets



Portable media players



Digital still cameras



Digital video cameras



Bluetooth

™ headsets



Portable navigation devices



Portable games consoles

BLOCK DIAGRAM

CMOS MEMS

Transducer

VDD

CHARGE

PUMP

GND

WM7121P

AMP

OUTPUT

3D VIEW

3.76mm x 2.95mm x 1.10mm LGA package