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參數(shù)資料
| 型號： | LMV105 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 769K |
| 代理商： | LMV105 |
Application Information
(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
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
pin 1 (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
, 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
L
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相關代理商/技術參數(shù) |
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| LMV1051 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Processor for Dual Microphone Adaptive Noise Cancelling with Wind Noise Alert |
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| LMV105M5X | 功能描述:IC AMPLIFIER FIXED-GAIN SOT23-5 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
| LMV105M7 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Fixed-Gain Amplifiers |
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