WM7130A WOLFSON [Wolfson Microelectronics plc], WM7130A Datasheet - Page 5

• Manufacturer Part Number: WM7130A
• Description: Bottom Port Analogue Silicon Microphone
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
ACOUSTIC AND ELECTRICAL CHARACTERISTICS
TERMINOLOGY
1.
2.
3.
4.
5.
w
Test Conditions: VDD=2.1V, 1kHz test signal, T
PARAMETER
Directivity
Sensitivity (WM7130A)
Sensitivity (WM7130AE)
Acoustic Overload
Signal to Noise Ratio
Total Harmonic Distortion
Dynamic Range
Frequency Response
Acoustic Noise Floor
Electrical Noise Floor
Power Supply Rejection Ratio
Current Consumption
Output DC Impedance
Sensitivity (dBV) - Sensitivity is a measure of the microphone output response to the acoustic pressure of a 1kHz
94dB SPL (1Pa RMS) sine wave.
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.
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.
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.
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.
SYMBOL
PSRR
SNR
THD
Z
I
DR
VDD
S
OUT
S
A
= 25°C
TEST CONDITIONS
Noise floor to 1% THD
+3dB High Frequency
-3dB Low Frequency
100mV RMS, 217Hz
A-Weighted,
A-Weighted
A-Weighted
A-Weighted
THD < 10%
104dB SPL
94dB SPL
94dB SPL
No Load
MIN
-41
-39
Omni-directional
12000
TYP
0.25
127
140
100
-38
-38
-99
61
89
62
33
50
PP, Rev 3.1, April 2012
MAX
190
-35
-37
WM7130A
dB SPL
dB SPL
UNIT
dBV
dBV
dBV
dB
dB
Hz
Hz
dB
µA
%
Ω
5