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TLV1018-25YDCR Datasheet(PDF) 7 Page - Texas Instruments |
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TLV1018-25YDCR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 12 page Measuring Noise and SNR A-Weighted Filter 5 pF Sound Pressure Level Absolute Sound Pressure (dB Pa) –94 dB Sensitivity (dBV/Pa) Voltage (dBV) Sound Pressure (dB SPL) TLV1018 www.ti.com .......................................................................................................................................... SLVS664A – OCTOBER 2008 – REVISED NOVEMBER 2008 The overall noise of the TLV1018 is measured within the frequency band from 10 Hz to 22 kHz using an A-weighted filter. The input of the TLV1018 is connected to ground with a 5-pF capacitor. Figure 3. Noise Measurement 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 (SPL) of 94 dBSPL. No input capacitor is connected. 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, and PO is the threshold of hearing (20 µPa) To calculate the resulting output voltage of the microphone for a given SPL, the sound pressure in dBSPL 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 = dBSPL + 20 log 20 µPa dBPa = dBSPL – 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 4. dBSPL to dBV Conversion Example: Busy traffic is 70 dBSPL VOUT = 70 – 94 – 44 = –68 dBV This is equivalent to 1.13 mVPP. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): TLV1018 |
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