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LMV721M5 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMV721M5 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 15 page 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 11 |
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