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LMV721 bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LMV721
Giải thích chi tiết về linh kiện  10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier
PDF  15 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMV721 bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI)

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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
1 = R2 = 4.7kΩ, sets the reference half way between VCC = 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
3 = 10kΩ and R4 = 500kΩ. 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
5 = 5kΩ is used to bias the electret microphone. Capacitors C1 = C2 = 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
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