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DESCRIPTION
The WM7220 is a low-profile silicon digital microphone. It
offers high Signal to Noise Ratio (SNR) and low power
consumption and is suited to a wide variety of consumer
applications.
The WM7220 incorporates Wolfson’s proprietary
CMOS/MEMS membrane technology, offering high
reliability and high performance in a miniature, low-profile
package. The WM7220 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 WM7220 incorporates a high performance ADC,
which outputs a single-bit Pulse Density Modulated (PDM)
audio data stream. The WM7220 supports selectable
left/right channel assignment for a two-channel digital
microphone interface, enabling efficient connection of
multiple microphones in stereo/array configurations.
The WM7220E 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.
WM7220, WM7220E
Top Port Digital Silicon Microphone
FEATURES
High SNR; selectable sensitivity tolerance options
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WM7220 – SNR 58dB, Sensitivity +/- 3dB
-
WM7220E – SNR 58dB, Sensitivity +/- 1dB
Low power
-
-
Sleep mode - 2μA
Normal operation - 650μA
Low profile packaging
Support for automated flow solder assembly
PDM digital audio output
Stereo/array operation
Proprietary ADC technology
-
Reduced clock jitter sensitivity
-
-
Low noise floor modulation
Stable in overload condition
Top port package
1.64V to 3.7V supply
4.72 x 3.76 x 1.22mm thin package design
APPLICATIONS
Mobile telephone handsets
Portable computers
Portable media players
Digital still cameras
Digital video cameras
Bluetooth headsets
Portable navigation devices
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Preliminary Technical Data, December 2011, Rev 2.3
Copyright
2011
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
