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WM7211IMSE/RV

P1-P3P4-P6P7-P9P10-P12P13-P13
WM7211 Pre-Production
w
PP, Rev 3.1, January 2014
4
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.
Wolfson 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 <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30C / 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 <30C / 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) -0.3V +4.2V
Voltage range digital inputs (LRSEL and CLK) GND-0.3V VDD+0.3V
Operating temperature range, T
A
-40ºC +100ºC
Storage temperature prior to soldering 30C max / 60% RH max
Storage temperature after soldering -40ºC +100ºC
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. For
information on recommended pick and place vacuum point, refer to the package dimension drawing.
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 SYMBOL MIN TYP MAX UNIT
Analogue Supply Range VDD 1.64 3.7 V
Ground GND 0 V
Clock Frequency F
CLK
1 3.25 MHz
Pre-Production WM7211
w
PP, Rev 3.1, January 2014
5
ACOUSTIC AND ELECTRICAL CHARACTERISTICS
Test Conditions: VDD=1.8V, 1kHz test signal, CLK=2.4MHz, T
A
= 25°C
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Directivity Omni-directional
Polarity (see note) Positive sound pressure Decreasing density of 1’s
Sensitivity (WM7211) S 94 dB SPL -29 -26 -23 dBFS
Sensitivity (WM7211E) S 94 dB SPL -27 -26 -25 dBFS
Acoustic Overload THD < 10% 120 dB SPL
Signal to Noise Ratio SNR A-Weighted 61 dB
Total Harmonic Distortion THD 100dB SPL input 0.1 1 %
Dynamic Range DR A-weighted noise floor to
1% THD
84 dB
Frequency response +3dB High frequency 17000 Hz
Acoustic Noise Floor A-weighted 33 dB SPL
Electrical Noise Floor A-weighted -87 dBFS
Power Supply Rejection PSR 217Hz Square Wave
100mV pk-pk
-75 dBFS
Digital Input / Output
CLK Input HIGH Level V
IH
0.65 x
VDD
V
CLK Input LOW Level V
IL
0.35 x
VDD
V
DAT Output HIGH Level V
OH
I
OH
= +1mA 0.9 x
VDD
V
DAT Output LOW Level V
OL
I
OL
= -1mA 0.1 x
VDD
V
Input capacitance (CLK) C
IN
0.5 pF
Maximum load capacitance
(DAT)
C
LOAD
100 pF
Input Leakage 1 μA
Short Circuit Output Current I
SC
DAT connected to GND 10 mA
Miscellaneous
Current Consumption I
VDD
Active Mode 735 μA
SLEEP Mode 2 10
Start-up Time From OFF 10 ms
From SLEEP 10
CLK Sleep Frequency 1.0 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.)
WM7211 Pre-Production
w
PP, Rev 3.1, January 2014
6
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 undistorted 1kHz sine wave that will fit in the digital output numerical range. 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. 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.
4. 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.
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. Parameter validated in electroacoustic laboratory and not guaranteed.
6. All performance measurements are carried out with 20kHz low pass ‘brick-wall’ filter 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. SLEEP Mode is enabled when the CLK input is below the CLK Sleep Frequency noted above. This is a power-saving
mode. Normal operation resumes automatically when the CLK input is above the CLK Sleep Frequency. Note that the
VDD supply is still required in SLEEP mode.
P1-P3P4-P6P7-P9P10-P12P13-P13

WM7211IMSE/RV

Mfr. #:
Buy WM7211IMSE/RV
Manufacturer:
Cirrus Logic
Description:
MEMS Microphones Top Port Digital Silicon Microphone
Lifecycle:
New from this manufacturer.
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