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WM7216E 데이터시트 PDF




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부품번호 WM7216E 기능
기능 Low Power Top Port Digital Silicon Microphone
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WM7216E 데이터시트, 핀배열, 회로
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-onvoice 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., 20142016
(All Rights Reserved)
Rev 4.0
MAY ‘16




WM7216E pdf, 반도체, 판매, 대치품
WM7216E
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Cirrus Logic tests its package types according to IPC/JEDEC J-STD-020 for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL2A = out of bag storage for 4 weeks at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
MIN MAX
Supply Voltage (VDD)
Voltage range digital inputs (LRSEL, CLK)
Operating temperature range, TA
Storage temperature prior to soldering
Storage temperature after soldering
-0.3V
+4.2V
-0.3V
2.3V (see note)
-40°C
+100°C
30°C max / 60% RH max
-40°C
+100°C
Note:
If VDD is above the minimum recommended operating level, the maximum input voltage is VDD + 0.3V.
IMPORTANT ASSEMBLY GUIDELINES
Do not put a vacuum over the port hole of the microphone. Placing a vacuum over the port hole can damage the device.
Do not board wash the microphone after a re-flow process. Board washing and the associated cleaning agents can damage the
device. Do not expose to ultrasonic cleaning methods.
Do not use vapour phase re-flow process. The vapour can damage the device.
Please refer to application note WAN0273 (MEMS MIC Assembly and Handling Guidelines) for further assembly and handling
guidelines.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
VDD Supply Range
Ground
Clock Frequency
SYMBOL
VDD
GND
FCLK
MIN
1.62
0.3
TYP
1.8
0
MAX
2.0
4.9
UNIT
V
V
MHz
4 Rev 4.0

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WM7216E 전자부품, 판매, 대치품
WM7216E
TERMINOLOGY
1. Sensitivity (dBFS) Sensitivity is a measure of the microphone output response to the acoustic pressure of a 1kHz 94dB SPL
(1Pa RMS) sine wave. This is referenced to the output Full Scale Range (FSR) of the microphone.
2. Full Scale Range (FSR) Sensitivity, Electrical Noise Floor and Power Supply Rejection are measured with reference to the
output Full Scale Range (FSR) of the microphone. FSR is defined as the amplitude of a 1kHz sine wave output whose positive
peak value reaches 100% density of logic 1s and whose negative peak value reaches 0% density of logic 1s. This is the largest
1kHz sine wave that will fit in the digital output range without clipping. Note that, because the definition of FSR is based on a
sine wave, it is possible to support a square wave test signal output whose level is +3dBFS.
3. Total Harmonic Distortion (%) THD is the ratio of the RMS sum of the harmonic distortion products in the specified bandwidth
(see note below) relative to the RMS amplitude of the fundamental (ie. test frequency) output.
4. Signal-to-Noise Ratio (dB) SNR is a measure of the difference in level between the output response of a 1kHz 94dB SPL
sine wave and the idle noise output.
5. Dynamic Range (dB) DR is the ratio of the 1% THD microphone output level (in response to a sine wave input) and the idle
noise output level.
6. All performance measurements are carried out within a 20Hz to 20kHz bandwidth and, where noted, an A-weighted filter.
Failure to use these filters will result in higher THD and lower SNR values than are found in the Acoustic and Electrical
Characteristics. The brick wall filter removes out of band noise.
7. Hi-Fi Record mode and Voice mode are selected according to CLK frequency, as described above.
8. Sleep Mode is enabled when the CLK input is stopped; this is a power-saving mode. Normal operation resumes automatically
when the CLK input frequency is within the specified operational limits. Note that the VDD supply is still required in Sleep
mode.
Rev 4.0
7

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부품번호상세설명 및 기능제조사
WM7216E

Low Power Top Port Digital Silicon Microphone

Cirrus Logic
Cirrus Logic

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