CS4294 datasheet(32/42 Pages) CIRRUS

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CS4294

DS326PP4

7.5

Power Supplies

The power supplies providing analog power should

be as clean as possible to minimize coupling into

the analog section which could degrade analog per-

formance. The pins AVdd1 and AVdd2 supply

power to all the analog circuitry on the CS4294.

This 5 Volt analog supply should be generated

from a voltage regulator (7805 type) connected to a

+12 Volt supply. This helps isolate the analog cir-

cuitry from noise typically found on +5 V digital

supplies which power many digital circuits in a PC

environment. A typical voltage regulator circuit for

analog power using an MC78M05CDT is shown in

Figure 14.

The digital power pins DVdd1 and DVdd2 should

be connected to the same digital supply as the AC

’97 Controller’s AC-Link interface. Since the digi-

tal interface on the CS4294 may operate at either

3.3 V or 5 V, proper connection of these pins will

depend on the digital power supply of the AC ’97

Controller. connections (vias). The AC-Link digi-

tal interface connection traces should be routed

such that digital ground plane lies underneath these

signals (on the internal ground layer) from the AC

’97 Controller continuously to the CS4294.

Figure 13. Headphones Driver

AGND

1/4 WATT

HP_OUT_R

ALT_LINE_OUT_L

HP_OUT_L

Vrefout

ALT_LINE_OUT_R

22pF

NPO

39k

Ω

22pF

NPO

TDA1308

27k

Ω

TDA1308

220

µF

ELEC

47K

Ω

1 2

ELEC

680pF

NPO

680pF

NPO

0.1

µF

Y5V

1.0

µF

Y5V

220

µF

Ω

+12VD

AGND

DGND

+5VA

0.1µF

Y5V

10µF

ELEC

10µF

ELEC

MC78M05CDT

OUT

GND

0.1µF

Y5V

Figure 14. Voltage Regulator

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