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ADMP510ACEZ-RL Datasheet(PDF) 7 Page - Analog Devices

Part No. ADMP510ACEZ-RL
Description  RF Hardened, Ultralow Noise Microphone with Bottom Port and Analog Output
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADMP510ACEZ-RL Datasheet(HTML) 7 Page - Analog Devices

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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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