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WM7230IMSE/RV Datasheet(PDF) 5 Page - Wolfson Microelectronics plc

Part No. WM7230IMSE/RV
Description  Bottom Port Digital 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

WM7230IMSE/RV Datasheet(HTML) 5 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM7230
w
PTD, Rev 2.4, October 2012
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
Sensitivity (WM7230)
S
94 dB SPL
-29
-26
-23
dBFS
Sensitivity (WM7230E)
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
0.1
1
%
Dynamic Range
DR
A-weighted noise floor to 1%
THD
85
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
-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
100
pF
Input Leakage
1
μA
Short Circuit Output Current
ISC
DAT connected to GND
10
mA
Miscellaneous
Current Consumption
IVDD
Active Mode
700
μA
SLEEP Mode
2
10
Start-up Time
From OFF
10
ms
From SLEEP
10
CLK Sleep Frequency
1.0
kHz
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.
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.


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