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LMV1031-20 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMV1031-20 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 10 page 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 8 |
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