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PDF ( 数据手册 , 数据表 ) WM7236E

零件编号 WM7236E
描述 Low Power Bottom Port Digital Silicon Microphone
制造商 Cirrus Logic
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WM7236E 数据手册, 描述, 功能
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







WM7236E pdf, 数据表
WM7236E
AUDIO INTERFACE TIMING
CLK
(input)
DAT
(LRSEL = 1)
DAT
(LRSEL = 0)
tCY
tL_DV
tL_EN
tR_DV
tL_DIS
tR_EN
tR_DIS
DAT is high-impedance (hi-z) when not outputting data
Figure 1 Digital Microphone Interface Timing
Test Conditions
The following timing information is valid across the full range of recommended operating conditions.
PARAMETER
Digital Microphone Interface Timing
CLK cycle time
CLK duty cycle
CLK rise/fall time
fCLK <= 3.072MHz
fCLK > 3.072MHz
DAT enable from rising CLK edge (LRSEL = 1)
DAT valid from rising CLK edge (LRSEL = 1)
DAT disable from falling CLK edge (LRSEL = 1)
DAT enable from falling CLK edge (LRSEL = 0)
DAT valid from falling CLK edge (LRSEL = 0)
DAT disable from rising CLK edge (LRSEL = 0)
SYMBOL
tCY
tL_EN
tL_DV
tL_DIS
tR_EN
tR_DV
tR_DIS
MIN
204
60:40
52:48
24
30
24
30
TYP
MAX
3333
40:60
48:52
6
80
20
80
20
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
Notes:
1. The DAT output is high-impedance when not outputting data; this enables the outputs of two microphones to be connected
together with the data from one microphone interleaved with the data from the other. (The microphones must be configured to
transmit on opposite channels in this case.)
2. In a typical configuration, the Left channel is transmitted following the rising CLK edge (LRSEL = 1). In this case, the Left
channel should be sampled by the receiving device on the falling CLK edge.
3. Similarly, the Right channel is typically transmitted following the falling CLK edge (LRSEL = 0). In this case, the Right channel
should be sampled by the receiving device on the rising CLK edge.
4. The WM7236 operating mode is selected according to the CLK frequency; see “Acoustic and Electrical Characteristics” for
further details.
8 Rev 4.0














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