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LMV1032 データシート(PDF) 8 Page - Texas Instruments

部品番号 LMV1032
部品情報  LMV1032-25 Amplifiers for 3-Wire Analog Electret Microphones
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LMV1032 データシート(HTML) 8 Page - Texas Instruments

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ABSOLUTE
SOUND
PRESSURE
[dBPa]
-94dB
SENSITIVITY
[dBV/Pa]
SOUND
PRESSURE
[dB SPL]
VOLTAGE
[dBV]
A-WEIGHTED FILTER
5pF
LMV1032
SNAS233G – DECEMBER 2003 – REVISED MAY 2013
www.ti.com
MEASURING NOISE AND SNR
The overall noise of the LMV1032 is measured within the frequency band from 10 Hz to 22 kHz using an A-
weighted filter. The input of the LMV1032 is connected to ground with a 5 pF capacitor.
Figure 22. Noise Measurement Setup
The signal-to-noise ratio (SNR) is measured with a 1 kHz input signal of 18 mVPP using an A-weighted filter. This
represents a sound pressure level of 94 dB SPL. No input capacitor is connected.
SOUND PRESSURE LEVEL
The volume of sound applied to a microphone is usually stated as the pressure level with respect to the threshold
of hearing of the human ear. The sound pressure level (SPL) in decibels is defined by:
Sound pressure level (dB) = 20 log Pm/PO
Where,
Pm is the measured sound pressure
PO is the threshold of hearing (20μPa)
In order to be able to calculate the resulting output voltage of the microphone for a given SPL, the sound
pressure in dB SPL needs to be converted to the absolute sound pressure in dBPa. This is the sound pressure
level in decibels which is referred to as 1 Pascal (Pa).
The conversion is given by:
dBPa = dB SPL + 20*log 20
μPa
dBPa = dB SPL - 94 dB
Translation from absolute sound pressure level to a voltage is specified by the sensitivity of the microphone. A
conventional microphone has a sensitivity of
−44 dBV/Pa.
Figure 23. dB SPL to dBV Conversion
8
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