CS8920 datasheet(22/66 Pages) CIRRUS

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AN84REV1

CS8920 Technical Reference Manual

2.2.2.1 Two layered printed circuit

board (PCB)

A two layered PCB has signal traces on the

component and solder side of the PCB. Fill

unused areas with copper planes.

Typically, planes on the component side of

the PCB are connected to ground and those

on the solder side are connected to VCC or

+5 volts.

Provide each pair of power pin with a 0.1

µF bypass capacitor. Place each bypass

capacitor as close as possible to the

corresponding power pin pair. Connect the

capacitor to the pads of the power pins by

short, wide traces, the other end of these

traces should be connected to VCC and

GND planes. Figure 2.2.2 and Figure 2.2.3

illustrate ground and power (Vcc) plane

connections, respectively.

2.2.2.2 Multi-layered printed circuit

board

A multi-layered printed circuit board (PCB)

typically has separate ground and power

(VCC) planes. Multi-layered PCBs are

required when the component and trace

density is high. Often discrete components

like resistors and capacitors are placed on

the solder side of a printed circuit board.

For a multi layer PCB with all components

on one side of the board, follow the power

connection guide lines as explained in

section 2.2.2.1. Instead of connecting the

ground and VCC to the copper fills on the

component and solder side of the board,

connect them to the internal ground and

VCC planes. Figures 2.2.4 through 2.2.9

show the four layers of the four-layer card.

For a multi-layered board the discrete

components are to be placed on the solder

side of the PCB, bypass capacitors for the

CS8920 can be placed on the solder side of

the PCB. Each bypass capacitor should be

placed beneath the CS8920 and closest to

its corresponding power pin pair. Figures

2.2.10 and 2.2.11 illustrate the placement

and routing of one bypass capacitor.

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