Silicon Microphone. WM7236E Datasheet

WM7236E Microphone. Datasheet pdf. Equivalent

WM7236E Datasheet
Recommendation WM7236E Datasheet
Part WM7236E
Description Low Power Bottom Port Digital Silicon Microphone
Feature WM7236E; WM7236E Low Power Bottom Port Digital Silicon Microphone DESCRIPTION The WM7236 is a low-profile d.
Manufacture Cirrus Logic
Datasheet
Download WM7236E Datasheet




Cirrus Logic WM7236E
WM7236E
Low Power Bottom Port Digital Silicon Microphone
DESCRIPTION
The WM7236 is a low-profile digital silicon microphone,
optimised for use with low-power ‘Always-onvoice control
applications, such as Cirrus Logic® SoundClear
software.
The WM7236 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 WM7236 incorporates Cirrus Logic proprietary
CMOS/MEMS membrane technology, offering high
reliability and high performance in a miniature, low-profile
package. The WM7236 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 WM7236 incorporates a high-performance ADC,
which outputs a single-bit data stream using Pulse Density
Modulation (PDM) encoding. The WM7236 supports
selectable left/right channel assignment for a two-channel
digital microphone interface, enabling efficient connection
of multiple microphones in stereo/array configurations.
The WM7236 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
Bottom 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
WM7236
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., 20142016
(All Rights Reserved)
Rev 4.0
MAY ‘16



Cirrus Logic WM7236E
TABLE OF CONTENTS
WM7236E
DESCRIPTION................................................................................................................ 1
FEATURES..................................................................................................................... 1
APPLICATIONS ............................................................................................................. 1
BLOCK DIAGRAM ......................................................................................................... 1
3D VIEW ......................................................................................................................... 1
TABLE OF CONTENTS.................................................................................................. 2
PIN CONFIGURATION ................................................................................................... 3
PIN DESCRIPTION......................................................................................................... 3
ORDERING INFORMATION........................................................................................... 3
ABSOLUTE MAXIMUM RATINGS ................................................................................. 4
IMPORTANT ASSEMBLY GUIDELINES ....................................................................... 4
RECOMMENDED OPERATING CONDITIONS.............................................................. 4
ACOUSTIC AND ELECTRICAL CHARACTERISTICS .................................................. 5
TERMINOLOGY .........................................................................................................................7
AUDIO INTERFACE TIMING .....................................................................................................8
TYPICAL PERFORMANCE............................................................................................ 9
APPLICATIONS INFORMATION ................................................................................. 10
RECOMMENDED EXTERNAL COMPONENTS......................................................................10
OPTIMISED SYSTEM RF DESIGN .........................................................................................10
CONNECTION TO A CIRRUS LOGIC AUDIO CODEC...........................................................10
PCB LAND PATTERN AND PASTE STENCIL ........................................................................11
PACKAGE DIMENSIONS............................................................................................. 12
IMPORTANT NOTICE .................................................................................................. 13
REVISION HISTORY .................................................................................................... 14
2 Rev 4.0



Cirrus Logic WM7236E
PIN CONFIGURATION
3
WM7236E
42
51
TOP VIEW
PIN DESCRIPTION
PIN NAME
1 CLK
2 LRSEL
TYPE
Digital Input
Digital Input
3 GND
Supply
4 VDD
Supply
5
DAT
Digital Output
DESCRIPTION
Clock input
Channel select
0 = Data output following falling CLK edge
1 = Data output following rising CLK edge
Internal pull-down holds this pin at logic 0 when not connected
Ground
Power supply
PDM data output
ORDERING INFORMATION
ORDER CODE
TEMPERATURE
RANGE
WM7236IMSE/RV
-40 to +100°C
Note:
Reel quantity = 4800
All devices are Pb-free and Halogen free.
PACKAGE
LGA
(tape and reel)
MOISTURE
SENSITIVITY LEVEL
MSL2A
PEAK SOLDERING
TEMPERATURE
+260°C
Rev 4.0
3







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