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WM7130AE Datasheet(PDF) 5 Page - Wolfson Microelectronics plc

Part # WM7130AE
Description  Bottom Port Analogue Silicon Microphone
Download  12 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM7130AE Datasheet(HTML) 5 Page - Wolfson Microelectronics plc

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Pre-Production
WM7130A
w
PP, Rev 3.1, April 2012
5
ACOUSTIC AND ELECTRICAL CHARACTERISTICS
Test Conditions: VDD=2.1V, 1kHz test signal, TA = 25°C
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Directivity
Omni-directional
Sensitivity (WM7130A)
S
94dB SPL
-41
-38
-35
dBV
Sensitivity (WM7130AE)
S
94dB SPL
-39
-38
-37
dBV
Acoustic Overload
No Load
THD < 10%
127
dB SPL
Signal to Noise Ratio
SNR
A-Weighted
61
dB
Total Harmonic Distortion
THD
104dB SPL
0.25
%
Dynamic Range
DR
A-Weighted,
Noise floor to 1% THD
89
dB
Frequency Response
-3dB Low Frequency
+3dB High Frequency
62
12000
Hz
Hz
Acoustic Noise Floor
A-Weighted
33
dB SPL
Electrical Noise Floor
A-Weighted
-99
dBV
Power Supply Rejection Ratio
PSRR
100mV RMS, 217Hz
50
dB
Current Consumption
IVDD
140
190
µA
Output DC Impedance
ZOUT
100
TERMINOLOGY
1.
Sensitivity (dBV) - Sensitivity is a measure of the microphone output response to the acoustic pressure of a 1kHz
94dB SPL (1Pa RMS) sine wave.
2.
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.
3.
Total Harmonic Distortion (dB) – THD is the ratio of the RMS sum of the harmonic distortion products in the specified
bandwidth (see note below) relative to the amplitude of the fundamental (ie. test frequency) output.
4.
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.
5.
All performance measurements are carried out with 20 kHz 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 low pass filter removes out of band noise.


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