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ADMP411 датащи(PDF) 7 Page - Analog Devices |
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ADMP411 датащи(HTML) 7 Page - Analog Devices |
7 / 12 page Data Sheet ADMP411 Rev. 0 | Page 7 of 12 APPLICATIONS INFORMATION CODEC CONNECTIONS The ADMP411 output 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 ADMP411 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 4.7 μF is recommended in Figure 11 because the ADAU1761/ADAU1361 input impedance can be as low as 2 kΩ at its highest PGA gain setting, which results in a high-pass filter corner frequency at 17 Hz. Figure 12 shows the ADMP411 connected to an ADA4075-2 op amp configured as a noninverting preamplifier. The AN-1165 Application Note describes using op amps for microphone preamp circuits and includes a list of recommended Analog Devices, Inc., op amps. Figure 11. ADMP411 Connected to the Analog Devices ADAU1761 or ADAU1361 Codec Figure 12. ADMP411 Connected to the ADA4075-2 Op Amp DYNAMIC RANGE CONSIDERATIONS To fully utilize the 99 dB dynamic range of the ADMP411 in a design, the preamp, ADC, or codec circuit following it must be chosen carefully. For example, the ADAU1761 has a 98 dB dynamic range with VDD = 3.3 V. To match the dynamic ranges between the microphone and the ADC input of the codec, some gain must be added to the ADMP411 output. For example, at the 131 dB SPL maximum acoustic input, the ADMP411 outputs a −13 dBV rms signal. The full-scale input voltage of the ADAU1761 ADC is 0 dBV; therefore, 13 dB of gain must be added to the signal to match the dynamic range of the microphone with the dynamic range of the codec. SUPPORTING DOCUMENTS Evaluation Board User Guide UG-445, EVAL-ADMP411Z-FLEX: Bottom-Ported Analog Output MEMS Microphone Evaluation Board 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 AN-1165, Op Amps for MEMS Microphone Preamp Circuits AN-1181, Using a MEMS Microphone in a 2-Wire Microphone Circuit ADAU1761 OR ADAU1361 ADMP411 VDD GND OUTPUT LINN LINP MICBIAS CM 4.7µF MINIMUM 0.1µF GAIN = (R1 + R2)/R1 ADMP411 GND OUTPUT 1µF MINIMUM 0.1µF 10kΩ R1 R2 VDD VREF VOUT VREF ADA4075-2 1.8V TO 3.3V |
Аналогичный номер детали - ADMP411 |
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Аналогичное описание - ADMP411 |
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