Data Sheet

ADMP621

APPLICATIONS INFORMATION

INTERFACING WITH ANALOG DEVICES CODECS

The PDM output of the ADMP621 interfaces directly with

the digital microphone inputs on the Analog Devices ADAU1361,

ADAU1761, ADAU1781, and ADAU1772 codecs. See the

connection diagram shown in Figure 18, and refer to the

AN-1003 Application Note and the respective data sheets of

the codecs for more details on the digital microphone interface.

The CN-0078 Circuit Note describes the connection between these

codecs and a digital microphone. All hardware configuration

information is the same for the ADMP621 as it is for the

ADMP421.

SUPPORTING DOCUMENTS

For additional information, see the following user guide, circuit

note, and application notes.

Evaluation Board User Guides

UG-326, PDM Digital Output MEMS Microphone Evaluation

Board

Circuit Note

CN-0078, High Performance Digital MEMS Microphone Simple

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

AN-1140, Microphone Array Beamforming

AVDD

MICBIAS

ADAU1361

OR

ADAU1761

0.1µF

0.1µF

1.8V TO 3.3V

JACKDET/MICIN

GND

L/R SELECT

DATA

CLK

ADMP621

ADMP621

GND

L/R SELECT

DATA

CLK

BCLK/GPIO2

Figure 18. ADAU1361 or ADAU1761 Stereo Interface Block Diagram

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