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EVAL-ADMP421Z Datasheet(PDF) 11 Page - Analog Devices

Part # EVAL-ADMP421Z
Description  Omnidirectional Microphone with Bottom Port and Digital Output
PDF  17 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

EVAL-ADMP421Z Datasheet(HTML) 11 Page - Analog Devices

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ADMP421
Data Sheet
Rev. D | Page 10 of 16
APPLICATIONS INFORMATION
INTERFACING WITH ANALOG DEVICES CODECS
Analog Devices ADAU1361, ADAU1761, and ADAU1781
codecs feature digital microphone inputs that support the
ADMP421 PDM output data format. See the connection
diagrams shown in Figure 12, and refer to the AN-1003
Application Note and the codecs’ respective data sheets for
more details on the digital microphone interface.
SLEEP MODE
The microphone enters sleep mode when the clock is turned off
or the clock frequency falls below 1 kHz. In sleep mode, the
microphone data output is in high impedance state and the
current consumption is less than 50 µA.
POWER SAVINGS WHEN DISABLING ONE
MICROPHONE IN A MULTIMICROPHONE
APPLICATION
The ADMP421 has a unique power-saving feature when used in
systems where two or more microphones share the same clock
and/or data lines. The microphone is designed to present high
impedance on both the clock and data pins when the power
supply (VDD) pin is at 0 V or floating. This disabled microphone
presents no load to and consumes no power from other active
microphones.
SUPPORTING DOCUMENTS
Evaluation Board User Guides
UG-118, EVAL-ADMP421Z Bottom Port Digital Output MEMS
Microphone Evaluation Board
UG-183, EVAL-ADMP421Z-FLEX: Bottom-Ported Digital
Output MEMS Microphone Evaluation Board
Circuit Note
CN-0078, iMEMS Digital Microphone Simplifies the Interface to
a 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
ADMP421
CLK
VDD
L/R SELECT
GND
DATA
0.1µF
ADMP421
CLK
VDD
L/R SELECT
GND
DATA
0.1µF
MICBIAS
AVDD
1.8V TO 3.3V
JACKDET/MICIN
BCLK/GPIO2
ADAU1361
OR
ADAU1761
DGND
AGND
Figure 12. ADAU1361 and ADAU1761 Stereo Interface Block Diagram



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