ADMP421BCEZ-RL7 datasheet(11/17 Pages) AD

No. de pieza	ADMP421BCEZ-RL7

Descripción Electrónicos	Omnidirectional Microphone with Bottom Port and Digital Output

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Fabricante Electrónico	AD [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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