WM7216E

10

Rev 4.0

APPLICATIONS INFORMATION

RECOMMENDED EXTERNAL COMPONENTS

It is recommended to connect a 0.1µF decoupling capacitor between the VDD and GND pins of the

WM7216. A ceramic 0.1µF capacitor with X7R dielectric or better is suitable. The capacitor should be

placed as close to the WM7216 as possible.

OPTIMISED SYSTEM RF DESIGN

For optimised RF design please refer to document WAN0278 (Recommended PCB Layout for

Microphone RF Immunity in Mobile Cell Phone Applications) for further information.

CONNECTION TO A CIRRUS LOGIC AUDIO CODEC

Cirrus Logic provides a range of audio CODECs incorporating a digital microphone input interface;

these support direct connection to digital microphones such as the WM7216.

Stereo connection of two WM7216 digital microphones is illustrated in Figure 2.

Further information on Cirrus Logic audio CODECs is provided in the respective product datasheet,

which is available from the Cirrus Logic website.

VDD

CLK

DAT

LRSEL

CLK

DAT

LRSEL

0.1

F

0.1

F

Audio CODEC

DMICCLK

DMICDAT

VDD

GND

WM7216

VDD

GND

WM7216

VDD

Figure 2 Stereo WM7216 Digital Microphone Connection