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PDF WM7211E Data sheet ( Hoja de datos )
| Número de pieza | WM7211E | |
| Descripción | Top Port Digital Silicon Microphone | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de WM7211E (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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WM7211E
Top Port Digital Silicon Microphone
DESCRIPTION
The WM7211 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 WM7211 incorporates Cirrus’s proprietary
CMOS/MEMS membrane technology, offering high
reliability and high performance in a miniature, low-profile
package. The WM7211 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 WM7211 incorporates a high performance ADC,
which outputs a single-bit data stream using Pulse Density
Modulation (PDM) encoding. The WM7211 supports
selectable left/right channel assignment for a two-channel
digital microphone interface, enabling efficient connection
of multiple microphones in stereo/array configurations.
The WM7211 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 (61dB)
Low variation in sensitivity (±1dB tolerance)
Low current consumption
- 2μA (Sleep)
- 735μA (Normal operation)
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
1.64V to 3.7V supply
APPLICATIONS
Mobile telephone handsets
Portable computers
Portable media players
Digital still cameras
Digital video cameras
Bluetooth headsets
Portable navigation devices
BLOCK DIAGRAM
WM7211
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., 2011–2016
(All Rights Reserved)
Rev 4.0
MAR ‘16
1 page  
WM7211E
ACOUSTIC AND ELECTRICAL CHARACTERISTICS
Test Conditions: VDD=1.8V, 1kHz test signal, CLK=2.4MHz, TA = 25°C, unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP
MAX
Directivity
Omni-directional
Polarity (see note)
Positive sound pressure
Decreasing density of 1s
Sensitivity
S
94dB SPL
-27 -26 -25
Acoustic Overload
No load, THD < 10%
120
Total Harmonic Distortion
THD
94dB SPL
0.1
114dB SPL
0.5
117.5dB SPL
1
Signal to Noise Ratio
SNR
A-weighted
61
Dynamic Range
DR A-weighted
84.5
Acoustic Noise Floor
A-weighted
33
Electrical Noise Floor
A-weighted
-87
Frequency Response
+3dB high frequency
17000
Frequency Response Flatness
200Hz to 8kHz
-1
+1
Power Supply Rejection
PSR
217Hz Square Wave
-75
100mV (peak-peak)
Digital Input / Output
CLK Input HIGH Level
VIH
0.65 x
VDD
CLK Input LOW Level
VIL
0.35 x
VDD
DAT Output HIGH Level
VOH
IOH = +1mA
0.9 x
VDD
DAT Output LOW Level
VOL
IOL = -1mA
0.1 x
VDD
Input capacitance (CLK)
Input Leakage
CIN
0.5
1
Maximum load capacitance
(DAT)
CLOAD
100
Short Circuit Output Current
Miscellaneous
ISC
DAT connected to GND
10
Current Consumption
IVDD Active Mode
SLEEP Mode
735
2 10
Start-up Time
From OFF
10
From SLEEP
10
CLK Sleep Frequency
1.0
UNIT
dBFS
dB SPL
%
dB
dB
dB SPL
dBFS
Hz
dB
dBFS
V
V
V
V
pF
μA
pF
mA
μA
ms
kHz
Note: The WM7211 generates a single-bit digital (PDM) output in response to the acoustic input. A positive sound pressure on the
diaphragm generates a decreasing density of 1’s in the PDM stream (i.e. there is a phase inversion between the acoustic input and
the digital output.)
Rev 4.0
5
5 Page 
PACKAGE DIMENSIONS
WM7211E
Rev 4.0
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet WM7211E.PDF ] | |
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