CS4297 datasheet(33/46 Pages) CIRRUS

33 / 46 page

DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

GROUNDING AND LAYOUT

Figure 10 is the suggested layout for the CS4297.

The decoupling capacitors should be located phys-

ically as close to the pins as possible. Also note the

routing of the REFFLT decoupling capacitors and

the isolation of that ground strip.

It is strongly recommended that the device be locat-

ed on a locally separate analog ground plane. This

analog ground plane is used to keep noise from dig-

ital ground return currents from modulating the

CS4297’s ground potential and degrading perfor-

mance. The digital ground pins should be connect-

ed to the digital ground plane and kept separate

from the analog ground connections of the CS4297

and any other external analog circuitry.

It is also recommended that the common connec-

tion point between the two ground planes (required

to maintain a common ground voltage potential) be

located near the CS4297 just under the digital

ground connections (vias). The AC-Link digital in-

terface connection traces should be routed such that

digital ground plane lies underneath these signals

(on the internal ground layer) from the AC’97 Con-

troller continuously to the CS4297.

Analog Ground

To Digital Ground

Pin 1

0.1 µF

390 pF

NPO

1µF

To Analog

Ground

To +5VA

To +5VD

0.1 µF

Y5V

To +5VD

0.1 µF

Y5V

0.1 µF

Y5V

To +5VA

AVdd2

AVss2

AFLT2

AFLT1

REFFLT

AVss1

AVdd1

DVss1

DVss2

DVdd2

DVdd1

Vrefout

to via

To Analog

Ground

Figure 10. Suggested Layout for the CS4297

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