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参数资料
| 型号： | TLV1012-15YDCR |
| 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： | 246K |
| 代理商： | TLV1012-15YDCR |
Measuring Noise and SNR
5 pF
A-Weighted
Filter
Sound Pressure Level
Absolute
Sound
Pressure
(dBPa)
–94 dB
Sensitivity
(dBV/Pa)
Sound
Pressure
(dBSPL)
Voltage
(dBV)
www.ti.com .......................................................................................................................................... SLCS154A – OCTOBER 2008 – REVISED NOVEMBER 2008
The overall noise of the TLV1012 is measured within the frequency band from 10 Hz to 22 kHz using an
A-weighted filter. The input of the TLV1012 is connected to ground with a 5-pF capacitor.
Figure 4. 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 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 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 sound pressure level, 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 5. dB SPL to dBV Conversion
For example, busy traffic is 70 dBSPL:
VOUT = 70 – 94 – 44 = –68 dBV
This is equivalent to 1.13 mVPP.
Because the TLV1012-15 has a gain of 6 (15.6 dB) over the JFET, the output voltage of the microphone is
6.78 mVPP. By replacing the JFET with the TLV1012-15, the sensitivity of the microphone is –28.4 dBV/Pa (–44 +
15.6).
Copyright 2008, Texas Instruments Incorporated
7
Product Folder Link(s): TLV1012
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