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参数资料
| 型号： | LMV102 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | Fixed-Gain Amplifiers |
| 中文描述： | 固定增益放大器 |
| 文件页数： | 10/12页 |
| 文件大小： | 769K |
| 代理商： | LMV102 |
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
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
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
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMV1022 | 制造商:TI 制造商全称:Texas Instruments 功能描述:PDM Output Pre-Amplifier for Electret Microphones |
| LMV1024 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024_09 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024UR | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PDM Output with Pre-Amplifier for Electret Microphones |
| LMV1024UR/NOPB | 功能描述:IC PRE AMP MIC MONO AB ADC 6USMD RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
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