WM7216 Datasheet, PDF (1/14 Pages) Cirrus Logic – Low Power Top Port Digital Silicon Microphone

WM7216E
Low Power Top Port Digital Silicon Microphone
DESCRIPTION
The WM7216 is a low-profile digital silicon microphone,
optimised for use with low-power ‘Always-on’ voice control
applications, such as Cirrus Logic^® SoundClear™
software.
The WM7216 supports two operational modes, selected
according to the applied clock frequency. ‘Voice’ mode
provides low current consumption, and sufficient SNR
performance for speech recognition algorithms. ‘Hi-Fi
Record’ mode offers wide dynamic range, and class-
leading THD performance. Operation in the ultrasonic
band is also supported at high clock frequencies.
The WM7216 incorporates Cirrus Logic proprietary
CMOS/MEMS membrane technology, offering high
reliability and high performance in a miniature, low-profile
package. The WM7216 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 WM7216 incorporates a high-performance ADC,
which outputs a single-bit data stream using Pulse Density
Modulation (PDM) encoding. The WM7216 supports
selectable left/right channel assignment for a two-channel
digital microphone interface, enabling efficient connection
of multiple microphones in stereo/array configurations.
The WM7216 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
- 10μA (Sleep)
- 290μA (Voice mode)
- 980μA (Hi-Fi Record mode)
 PDM digital audio output
 Stereo/array operation
 Proprietary ADC technology
- Reduced clock-jitter sensitivity
- Low noise floor
- Stable in overload condition
 Top Port LGA Package
 1.62V to 2.0V supply
APPLICATIONS
 Mobile telephone handsets
 Wearable devices
 Portable media players
 Digital cameras
 Tablets and laptop computers
BLOCK DIAGRAM
VDD
WM7216
CHARGE
PUMP
CONTROL
CMOS MEMS
Transducer
AMP
ADC
GND
3D VIEW
CLK
DAT
LRSEL
4.00mm x 3.00mm x 1.00mm LGA package
http://www.cirrus.com
Copyright  Cirrus Logic, Inc., 2014–2016
(All Rights Reserved)
Rev 4.0
MAY ‘16