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参数资料
| 型号： | TLV1018-25YDCR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, AUDIO AMPLIFIER, PBGA4 |
| 封装： | GREEN, DSBGA-4 |
| 文件页数： | 10/12页 |
| 文件大小： | 615K |
| 代理商： | TLV1018-25YDCR |
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)
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 Pa)
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
Pa
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
7
Product Folder Link(s): TLV1018
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