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參數(shù)資料
| 型號： | LMV721M7 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier |
| 中文描述： | OP-AMP, 3000 uV OFFSET-MAX, 10 MHz BAND WIDTH, PDSO5 |
| 封裝： | 2 X 2 MM, 1 MM HEIGHT, SC-70, 5 PIN |
| 文件頁數(shù)： | 11/15頁 |
| 文件大小： | 459K |
| 代理商： | LMV721M7 |
Application Notes
(Continued)
Here is a LMV721 used as a microphone preamplifier. Since the LMV721 is a low noise and low power op amp, it makes it an
ideal candidate as a battery powered microphone preamplifier. The LMV721 is connected in an inverting configuration. Resistors,
R
= R
= 4.7k
, sets the reference half way between V
= 3V and ground. Thus, this configures the op amp for single supply
use. The gain of the preamplifier, which is 50 (34dB), is set by resistors R
= 10k
and R
= 500k
. The gain bandwidth product
for the LMV721 is 10 MHz. This is sufficient for most audio application since the audio range is typically from 20 Hz to 20kHz. A
resistor R
= 5k
is used to bias the electret microphone. Capacitors C
1
= C
2
= 4.7μF placed at the input and output of the op
amp to block out the DC voltage offset.
DS100922-44
FIGURE 11. A Battery Powered Microphone Preamplifier
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV721M7 | 制造商:Texas Instruments 功能描述:OP AMP ULTRA LOW NOISE POWERWISE |
| LMV721M7/NOPB | 功能描述:運算放大器 - 運放 Ultra Low Noise Sgl Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV721M7X | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV721M7X/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV721-N | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LMV721-N/LMV722 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier |
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