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LMV1032UP-06 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMV1032UP-06 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 12 page Application Section LOW CURRENT The LMV1032 has low supply current for a longer battery life. The low supply current makes this amplifier suitable for microphone applications which need to be always on. BUILT IN GAIN The LMV1032 is offered in space saving small micro SMD package in order to fit in the metal can of a microphone. The LMV1032 is placed on the PCB inside the microphone. The bottom side of the PCB has the pins that connect the supply voltage to the amplifier and make the output avail- able. The input of the amplifier is connected inside the metal can via the PCB to the microphone. A-WEIGHTED FILTER The human ear has a frequency range from 20 Hz to about 20 kHz. Within this range the sensitivity of the human ear is not equal for each frequency. To approach the hearing re- sponse weighting filters are introduced. One of those filters is the A-weighted filter. The A-weighted filter is usually used in signal to noise ratio measurements, where sound is compared to device noise. It improves the correlation of the measured data to the signal to noise ratio perceived by the human ear. MEASURING NOISE AND SNR The overall noise of the LMV1032 is measured within the frequency band from 10 Hz to 22 kHz using an A-weighted filter. The input of the LMV1032 is connected to ground with a 5 pF capacitor. Signal to noise ratio (SNR) is measured with a 1 kHz input signal of 18 mV PP using an A-weighted filter. This represents a sound pressure level of 94 dB SPL. No input capacitor is connected. SOUND PRESSURE LEVEL The volume of sound applied to a microphone is usually stated as a pressure level referred to the threshold of hear- ing of the human ear. The sound pressure level (SPL) in decibels is defined by: Sound pressure level (dB) = 20 log P m/PO Where, P m is the measured sound pressure P O is the threshold of hearing (20µPa) In order to be able to calculate the resulting output voltage of the microphone for a given SPL, the sound pressure in dB SPL needs to be converted to the absolute sound pressure in dBPa. This is the sound pressure level in decibels referred to 1 Pascal (Pa). 20084202 FIGURE 1. Built-in Gain 20084209 FIGURE 2. A-Weighted Filter 20084210 FIGURE 3. Noise Measurement Setup www.national.com 8 |
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