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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.
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WM7121, WM7121E
Top Port Analogue Silicon Microphone
FEATURES
High SNR; selectable sensitivity tolerance options
WM7121 - SNR 65dB, Sensitivity +/-3dB
WM7121E - SNR 65dB, Sensitivity +/-1dB
Matched sensitivity performance
Matched frequency response
Matched phase response
Matched performance to bottom port microphone WM7132
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
BLOCK DIAGRAM
VDD
Charge
Pump
Transducer
(CMOS MEMS)
Amp
OUTPUT
WM7121
GND
WOLFSON MICROELECTRONICS plc
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GND
Preliminary Technical Data, October 2012, 2.0
Copyright
2012
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
