INMP521

Figure 12. Stereo PDM Microphone Connection to Codec

Decouple the VDD pin of the INMP521 to GND with a 0.1 µF capacitor. Place this capacitor as close to VDD as the printed circuit

board (PCB) layout allows.

Do not use a pull-up or pull-down resistor on the PDM data signal line because the resistor can pull the signal to an incorrect state

during the period that the signal line is tristated.

CLOCK OUTPUT

CODEC

0.1µF

1.8V TO 3.3V

GND

L/R SELECT DATA

INMP521

CLK

VDD

DATA INPUT

0.1µF

1.8V TO 3.3V

GND

L/R SELECT DATA

INMP521

CLK

VDD

Page 13 of 20

Document Number: DS-INMP521-00

Revision: 1.0.