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ADMP401ACEZ-RL7 датащи(PDF) 9 Page - Analog Devices |
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ADMP401ACEZ-RL7 датащи(HTML) 9 Page - Analog Devices |
9 / 13 page ADMP401 Data Sheet Rev. E | Page 8 of 12 APPLICATIONS INFORMATION The ADMP401 output can be connected to a dedicated codec microphone input (see Figure 9) or to a high input impedance gain stage (see Figure 10). A 0.1 µF ceramic capacitor placed close to the ADMP401 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 9 because the input impedance of the ADAU1361/ADAU1761 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. Figure 10 shows the ADMP401 connected to the ADA4897-1 op amp configured as a noninverting preamplifier. CONNECTING THE ADMP401 TO A CODEC LINN LINP MICBIAS ADAU1761 OR ADAU1361 2.2µF MINIMUM VDD GND ADMP401 OUTPUT CM 0.1µF Figure 9. ADMP401 Connected to the Analog Devices ADAU1761 or ADAU1361 Codec CONNECTING THE ADMP401 TO AN OP AMP GAIN STAGE 1µF MINIMUM 10kΩ R2 R1 VREF ADA4897-1 VDD GAIN = (R1 + R2)/R1 GND ADMP401 OUTPUT 0.1µF VO VREF Figure 10. ADMP401 Connected to the ADA4897-1 Op Amp SUPPORTING DOCUMENTS 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 AN-1140, Microphone Array Beamforming Circuit Notes CN-0207, High Performance Analog MEMS Microphone’s Simple Interface to SigmaDSP Audio Codec CN-0262, Low Noise Analog MEMS Microphone and Preamp with Compression and Noise Gating Evaluation Board User Guides UG-126, EVAL-ADMP401Z: Bottom-Ported Analog Output MEMS Microphone Evaluation Board UG-278, EVAL-ADMP401Z-FLEX: Bottom-Ported Analog Output MEMS Microphone Evaluation Board |
Аналогичный номер детали - ADMP401ACEZ-RL7 |
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Аналогичное описание - ADMP401ACEZ-RL7 |
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