CS4298 datasheet(40/52 Pages) CIRRUS

40 / 52 page

CS4298

DS315PP2

The Vrefout pin is typically 2.2 V and provides a common mode signal for single-supply external

circuits. Vrefout only supports light DC loads and should be buffered if AC loading is needed. For

typical use, a 0.1

µF in parallel with a 1 µF capacitor should be connected to Vrefout.

7.6

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 performance. The pins AVdd1 and AVdd2 supply

power to all the analog circuitry on the CS4298. 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 circuitry

from noise typically found on +5 V digital supplies which power many digital circuits in a PC envi-

ronment. A typical voltage regulator circuit for analog power using an MC78M05CDT is shown in

Figure 15.

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 digital interface on the CS4298 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 digital interface connection traces should be routed

DGND

374

90.9

J-RCA-R4-PCB

GND

VCC

+5 V PCI

0.1

µF

SN75179D

DGND

+5V_PCI

SPDIFO

TOTX-173

8.2K

µF

SPDIFO

Figure 14. IEC-958 Interface Examples

+12VD

AGND

DGND

+5VA

0.1µF

Y5V

10µF

ELEC

10µF

ELEC

MC78M05CDT

OUT

GND

0.1µF

Y5V

Figure 15. Voltage Regulator

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