WM7121 Datasheet, PDF (1/12 Pages) Wolfson Microelectronics plc – Top Port Analogue Silicon Microphone

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WM7121, WM7121E
Top Port Analogue Silicon Microphone
DESCRIPTION
The WM7121 is a low-profile silicon analogue microphone. It
offers high Signal to Noise Ratio (SNR) and low power
consumption and is suited to a wide variety of consumer
applications.
The WM7121 incorporates Wolfson’s proprietary
CMOS/MEMS membrane technology, offering high reliability
and high performance in a miniature, low-profile package.
The WM7121 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 WM7121E variant offers a tighter 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.
BLOCK DIAGRAM
VDD
FEATURES
 High SNR; selectable sensitivity tolerance options
- WM7121 - SNR 65dB, Sensitivity +/-3dB
- WM7121E - SNR 65dB, Sensitivity +/-1dB
 Matched performance to bottom port microphone WM7132
- Matched sensitivity performance
- Matched frequency response
- Matched phase response
 Low supply current 200µA
 Low profile packaging
 Support for automated flow solder assembly
 Analogue output
 Top Port Package
 1.5V to 3.7V supply
 3.76mm x 2.95mm x 1.10mm Package
APPLICATIONS
 Mobile phone handsets
 Portable media players
 Digital still cameras
 Digital video cameras
 Bluetooth headsets
 Portable navigation devices
 Portable games consoles
Transducer
(CMOS MEMS)
Charge
Pump
Amp
OUTPUT
WM7121
WOLFSON MICROELECTRONICS plc
GND
GND
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Preliminary Technical Data, October 2012, 2.0
Copyright 2012 Wolfson Microelectronics plc