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PDF WM7216E Data sheet ( Hoja de datos )
| Número de pieza | WM7216E | |
| Descripción | Low Power Top Port Digital Silicon Microphone | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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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
WM7216
VDD
CHARGE
PUMP
CONTROL
3D VIEW
CLK
DAT
LRSEL
CMOS MEMS
Transducer
AMP
ADC
GND
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
1 page  
WM7216E
ACOUSTIC AND ELECTRICAL CHARACTERISTICS
Test Conditions: VDD=1.8V, 1kHz test signal, CLK=3.072MHz, CLOAD = 100pF, TA = 25°C, unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
Directivity
Omni-directional
Polarity
Positive sound pressure
Increasing density of 1s
Sensitivity
S
94dB SPL
-27 -26 -25
Voice Mode: CLK=768kHz
Acoustic Overload
THD < 10%
120
Total Harmonic Distortion
THD
94dB SPL,
200Hz to 8kHz
0.05
118dB SPL,
200Hz to 8kHz
1
Signal to Noise Ratio
SNR
A-weighted,
200Hz to 8kHz
60
Dynamic Range
DR A-weighted,
200Hz to 8kHz
84
Acoustic Noise Floor
A-weighted,
200Hz to 8kHz
34
Electrical Noise Floor
A-weighted,
200Hz to 8kHz
-86
Power Supply Rejection
PSR
217Hz square wave,
100mV (peak-peak)
-70
Hi-Fi Record Mode: CLK=3.072MHz
Acoustic Overload
THD < 10%
120
Total Harmonic Distortion
THD
94dB SPL
0.05
118dB SPL
1
Signal to Noise Ratio
SNR
A-weighted
63
Dynamic Range
DR A-weighted
87
Acoustic Noise Floor
A-weighted
31
Electrical Noise Floor
A-weighted
-89
Power Supply Rejection
PSR
217Hz square wave,
100mV (peak-peak)
-65
Hi-Fi Record Mode (Ultrasonic operation): CLK=3.84MHz
Acoustic Overload
THD < 10%
120
Total Harmonic Distortion
THD
94dB SPL
0.05
118dB SPL
1
Signal to Noise Ratio
SNR
A-weighted
63
Dynamic Range
DR A-weighted
87
Acoustic Noise Floor
A-weighted
31
Electrical Noise Floor
A-weighted
-89
Power Supply Rejection
PSR
217Hz square wave,
100mV (peak-peak)
-65
Frequency Response
Frequency Response
-3dB low frequency
62
+3dB high frequency
12000
Frequency Response Flatness
200Hz to 8kHz
-1
+1
UNIT
dBFS
dB SPL
%
dB
dB
dB SPL
dBFS
dBFS
dB SPL
%
dB
dB
dB SPL
dBFS
dBFS
dB SPL
%
dB
dB
dB SPL
dBFS
dBFS
Hz
dB
Rev 4.0
5
5 Page 
WM7216E
PCB LAND PATTERN AND PASTE STENCIL
The recommended PCB Land Pattern and Paste Stencil Pattern for the WM7216 microphone are
shown in Figure 3 and Figure 4.
See also Application Note WAN0284 (General Design Considerations for MEMS Microphones) for
further details of PCB footprint design.
Full definition of the package dimensions is provided in the “Package Dimensions” section.
Figure 3 DM096 - PCB Land Pattern, Top View
Figure 4 DM096 - Paste Stencil Pattern, Top View
Rev 4.0
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet WM7216E.PDF ] | |
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