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WM7231E Datasheet(PDF) 5 Page - Wolfson Microelectronics plc

Part No. WM7231E
Description  Bottom Port Digital Silicon Microphone
Download  14 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM7231E Datasheet(HTML) 5 Page - Wolfson Microelectronics plc

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Pre-Production
WM7231
w
PP, Rev 3.0, January 2014
5
ACOUSTIC AND ELECTRICAL CHARACTERISTICS
Test Conditions:
VDD=1.8V, 1kHz test signal, CLK=2.4MHz, TA = 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 (WM7231)
S
94 dB SPL
-29
-26
-23
dBFS
Sensitivity (WM7231E)
S
94 dB SPL
-27
-26
-25
dBFS
Acoustic Overload
THD < 10%
120
dB SPL
Signal to Noise Ratio
SNR
A-Weighted
60
dB
Total Harmonic Distortion
THD
100dB SPL
0.1
1
%
Dynamic Range
DR
A-Weighted,
Noise floor to 1% THD
84
dB
Frequency Response
-3dB High frequency
85
Hz
+3dB High frequency
17000
Hz
Acoustic Noise Floor
A-weighted
34
dB SPL
Electrical Noise Floor
A-weighted
-86
dBFS
Power Supply Rejection
PSR
217Hz Square Wave
100mV pk-pk
-70
dBFS
Digital Input / Output
CLK Input HIGH Level
VIH
0.65 x
VDD
V
CLK Input LOW Level
VIL
0.35 x
VDD
V
DAT Output HIGH Level
VOH
IOH = +1mA
0.9 x
VDD
V
DAT Output LOW Level
VOL
IOL = -1mA
0.1 x
VDD
V
Input capacitance (CLK)
CIN
0.5
pF
Maximum load capacitance
(DAT)
CLOAD
200
pF
Input Leakage
1
μA
Short Circuit Output Current
ISC
DAT connected to GND
10
mA
Miscellaneous
Current Consumption
IVDD
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 WM7231 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 (ie. there is a phase inversion between the
acoustic input and the digital output).


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