ADMP421

Rev. 0 | Page 10 of 16

INTERFACING WITH ANALOG DEVICES CODECS

Analog Devices ADAU1361 and ADAU1761 codecs feature

digital microphone inputs that support the ADMP421 PDM

output data format. See the connection diagrams shown in

Figure 1

2 and Figure 13, and refer to the ADMP421 AN-1003

Application Note and the codecs’ respective data sheets for

more details on the digital microphone interface.

JDFUNC[1:0]

DIGITAL MICROPHONE

INTERFACE

LEFT

CHANNEL

RIGHT

CHANNEL

TO JACK

DETECTION

CIRCUIT

JACKDET/MICIN

RIGHT

ADC

LEFT

ADC

DECIMATORS

R19: ADC CONTROL

INSEL

R2: DIGITAL MICROPHONE/

JACK DETECTION

CONTROL

Figure 12. Digital Microphone Signal Routing Block Diagram

ADMP421

DIGITAL MICROPHONE

CLK

BCLK

LINP

CM

L/R SELECT

GND

DATA

0.1µF

ADMP421

DIGITAL MICROPHONE

CLK

BCLK

L/R SELECT

GND

DATA

0.1µF

MICBIAS

LINN

RINN

RINP

JACKDET/MICIN

ADAU1361

OR

ADAU1761

Figure 13. ADAU1361 and ADAU1761 Stereo Interface Block Diagram