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ADMP510 Datasheet(PDF) 7 Page - Analog Devices |
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ADMP510 Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page Data Sheet ADMP510 Rev. 0 | Page 7 of 12 APPLICATIONS INFORMATION INTERFACING WITH ANALOG DEVICES CODECS The output of the ADMP510 can be connected to a dedicated codec microphone input (see Figure 11) or to a high input impedance gain stage (see Figure 12). A 0.1 µF ceramic capacitor placed close to the ADMP510 supply pin is used for testing and is recommended to adequately decouple the microphone from noise on the power supply. A dc blocking capacitor is required at the output of the microphone. This capacitor creates a high- pass filter with a corner frequency at fC = 1/(2π × C × R) where R is the input impedance of the codec. A minimum value of 2.2 μF is recommended in Figure 11 because the input impedance of the ADAU1761/ADAU1361 can be as low as 2 kΩ at its highest PGA gain setting, which results in a high-pass filter corner frequency at about 37 Hz. ADAU1761 OR ADAU1361 ADMP510 GND OUTPUT LINN LINP MICBIAS CM 2.2µF MINIMUM 0.1µF VDD Figure 11. ADMP510 Connected to the ADAU1761 or ADAU1361 Codec Figure 12 shows the ADMP510 connected to an ADA4075-2 op amp configured as a noninverting preamplifier. GAIN = (R1 + R2)/R1 ADMP510 GND OUTPUT 1µF MINIMUM 0.1µF 10kΩ R1 R2 VDD VREF VOUT VREF ADA4075-2 Figure 12. ADMP510 Connected to the ADA4075-2 Op Amp SUPPORTING DOCUMENTS For additional information, see the following documents. Evaluation Board User Guide UG-325, Analog Output MEMS Microphone Flex Evaluation Board Circuit Note CN-0207, High Performance Analog MEMS Microphone’s Simple Interface to SigmaDSP Audio Codec Application Notes AN-1003, Recommendations for Mounting and Connecting the Analog Devices, Inc., Bottom-Ported MEMS Microphones AN-1068, Reflow Soldering of the MEMS Microphone AN-1112, Microphone Specifications Explained AN-1124, Recommendations for Sealing Analog Devices, Inc., Bottom-Port MEMS Microphones from Dust and Liquid Ingress AN-1140, Microphone Array Beamforming AN-1165, Op Amps for MEMS Microphone Preamp Circuits AN-1181, Using a MEMS Microphone in a 2-Wire Microphone Circuit |
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