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LMV105M7X Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMV105M7X Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 12 page Application Notes (Continued) To improve power supply ripple rejection of the above micro- phone preamplifier, another capacitor and a pot can be con- nected to pin 1 as shown in Figure 6. The impedance of the two capacitors at audio frequencies are low. The R POT can be adjusted so that the supply ripples injected through both the inverting input and the non-inverting input cancel each other at the output. If we ignore the impedance of the capaci- tors, we can select the pot value based on the following equation: Z OUT is the output impedance of the microphone, and G is the gain of the preamplifier in absolute value. 6.0 Adjustable-Gain Amplifier The LMV101/102/105/110 not only provides fixed gain of −1, −2, −5, and −10, it can also be configured for different gains by adding only one external resistor. You can decrease the gain by putting a resistor in series with pin1( Figure 7). You can increase the gain by connecting a resistor from pin 1 to pin 3 ( Figure 8). If you are using the LMV110 as a microphone preamplifier for an electret microphone ( Figure 5), and the output imped- ance of the microphone is 1k Ω, then the gain of the pream- plifier is If we choose a small value for R, then we could get a pream- plifier with a gain close to 100 (40dB), which is 10 times the gain provided by LMV110. DS101234-15 FIGURE 5. Microphone Preamplifier with 20dB Gain DS101234-17 FIGURE 6. Improved Ripple Rejection DS101234-18 FIGURE 7. Decreased Gain DS101234-19 FIGURE 8. Increased Gain www.national.com 10 |
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