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ADMP504 Datenblatt(PDF) 7 Page - Analog Devices |
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ADMP504 Datenblatt(HTML) 7 Page - Analog Devices |
7 / 12 page Data Sheet ADMP504 Rev. 0 | Page 7 of 12 APPLICATIONS INFORMATION The ADMP504 output can be connected to a dedicated codec microphone input (see Figure 8) or to a high input impedance gain stage (see Figure 9). A 0.1 µF ceramic capacitor placed close to the ADMP504 supply pin is used for testing and is recom- mended 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 codec’s input impedance. A minimum value of 2.2 μF is recommended in Figure 8 because the input impedance of the ADAU1361/ADAU1761 can be as low as 2 kΩ at its highest PGA gain setting, which would result in a high-pass filter corner frequency at about 37 Hz. Figure 9 shows the ADMP504 connected to an ADA4897-1 op amp configured as a noninverting preamplifier. ADAU1761 OR ADAU1361 ADMP504 GND OUTPUT LINN LINP MICBIAS CM 2.2µF MINIMUM 0.1µF VDD Figure 8. ADMP504 Connected to the Analog Devices ADAU1761 or ADAU1361 Codec GAIN = (R1 + R2)/R1 ADMP504 GND OUTPUT 1µF MINIMUM 0.1µF 10k Ω R1 R2 VDD VREF VOUT VREF ADA4897-1 Figure 9. ADMP504 Connected to the ADA4897-1 Op Amp SUPPORTING DOCUMENTS Evaluation Board User Guide UG-325, EVAL-ADMP504-FLEX: Bottom-Ported Analog Output MEMS Microphone Evaluation Board Circuit Note CN-0207, High Performance iMEMS Analog Microphone’s Simple Interface to SigmaDSP Audio Codec Application Notes AN-1003, Recommendations for Mounting and Connecting 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 |
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