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LMV1032 データシート(PDF) 9 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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ホームページ  http://www.ti.com
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LMV1032 データシート(HTML) 9 Page - Texas Instruments

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10
1k
1M
FREQUENCY (Hz)
-15
-5
5
20
100k
10k
100
15
0
-10
10
PHASE
GAIN
150
300
450
400
250
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LMV1032
www.ti.com
SNAS233G – DECEMBER 2003 – REVISED MAY 2013
Example: Busy traffic is 70 dB SPL
VOUT = 70 −94 −44 = −68 dBV
This is equivalent to 1.13 mVPP
Since the LMV1032-15 has a gain of 5.6 (15 dB) over the JFET, the output voltage of the microphone is 6.35
mVPP. By replacing the JFET with the LMV1032-15, the sensitivity of the microphone is −29 dBV/Pa (−44 + 15).
LOW FREQUENCY CUT OFF FILTER
To reduce noise on the output of the microphone a low cut filter has been implemented in the LMV1032. This
filter reduces the effect of wind and handling noise.
It's also helpful to reduce the proximity effect in directional microphones. This effect occurs when the sound
source is very close to the microphone. The lower frequencies are amplified which gives a bass sound. This
amplification can cause an overload, which results in a distortion of the signal.
Figure 24. Gain vs. Frequency
The LMV1032 is optimized to be used in audio band applications. The LMV1032 provides a flat gain response
within the audio band and offers linearity and excellent temperature stability.
ADVANTAGE OF THREE PINS
The LMV1032 ECM solution has three pins instead of the two pins provided in the case of a JFET solution. The
third pin provides the advantage of a low supply current, high PSRR and eliminates the need for additional
components.
Noise pick-up by a microphone in a cell phone is a well-known problem. A conventional JFET circuit is sensitive
for noise pick-up because of its high output impedance. The output impedance is usually around 2.2 k
Ω. By
providing separate output and supply pins a much lower output impedance is achieved and therefore is less
sensitive to noise pick-up.
RF noise is among other caused by non-linear behavior. The non-linear behavior of the amplifier at high
frequencies, well above the usable bandwidth of the device, causes AM demodulation of high frequency signals.
The AM modulation contained in such signals folds back into the audio band, thereby disturbing the intended
microphone signal. The GSM signal of a cell phone is such an AM-modulated signal. The modulation frequency
of 216 Hz and its harmonics can be observed in the audio band. This type of noise is called bumblebee noise.
EXTERNAL PRE-AMPLIFIER APPLICATION
The LMV1032 can also be used outside of an ECM as a space saving external pre-amplifier. In this application,
the LMV1032 follows a phantom biased JFET microphone in the circuit. This is shown in Figure 25. The input of
the LMV1032 is connected to the microphone via the 2.2 µF capacitor. The advantage of this circuit over one
with only a JFET microphone are the additional gain and the high pass filter supplied by the LMV1032. The high
pass filter makes the output signal more robust and less sensitive to low frequency disturbances. In this
configuration the LMV1032 should be placed as close as possible to the microphone.
Copyright © 2003–2013, Texas Instruments Incorporated
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