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LMV1031URX-20 データシート(PDF) 9 Page - Texas Instruments

部品番号 LMV1031URX-20
部品情報  Amplifier for Internal 3-Wire Analog Microphones and External Preamplifier
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

LMV1031URX-20 データシート(HTML) 9 Page - Texas Instruments

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Application Section (Continued)
The LMV1031 is optimized to be used in audio band appli-
cations. As shown in Figure 7, the LMV1031 provides a flat
gain response within the audio band and offers excellent
temperature stability.
ADVANTAGE OF THREE PINS
When implemented in an Electret Condenser Microphone
(ECM) the LMV1031 adds the advantages of a three pin
configuration. The third pin provides a low supply current,
higher PSRR, and eliminates the need for additional external
components.
It is well known that cell phone microphones are sensitive to
noise pick-up. A conventional JFET circuit is sensitive to
noise pick-up because of its high output impedance, which is
usually around 2.2 k
Ω. The LMV1031 is less sensitive to
noise pick-up because it provides separate output and sup-
ply pins. Using separate pins greatly reduces the output
impedance.
20150821
FIGURE 7. Gain vs. Frequency
www.national.com
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同様の説明 - LMV1031URX-20

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