CS6403 datasheet(23/54 Pages) CIRRUS

23 / 54 page

Detailed Power Supply Connections

Figure 9 shows the detailed power supply con-

nections.

The CS6403 requires a clean analog

quality +5V supply. The digital supply for the

CS6403 should be derived through a 2

Ω resistor

from the clean system analog supply, and should

not be connected directly to the board-level digi-

tal 5V supply.

Grounding and Layout

The CS6403 requires very careful attention to

layout, power supplies, and decoupling to

achieve rated performance.

Extensive use of

ground planes and ground-plane fill is recom-

mended. The system performance is optimized

when the circuit board is partitioned into a digi-

tal region and an analog region, each with its

own, non-overlapping, ground plane.

The

CS6403 should be completely over the analog

ground plane, close to the digital region.

The

package should be oriented so that the digital

pins face toward the digital region of the board.

Figure 10 shows the general guidelines for

proper layout.

The power and ground connections for the

speaker (PVDD and PGND) should be routed

separately from the analog power and ground

planes to prevent the high speaker currents from

flowing in the same ground plane as the micro-

phone signal. In applications where the speaker

driver is not used no separate ground routing is

required.

Embedded Signal-Processing Functions

As shown in Figure 3, the CS6403 provides sev-

eral processing functions that are required for

good full-duplex, hands-free performance.

CS6403

AVDD

AGND0

PVDD

PGND0

PGND1

0.1

µF

+5V

Analog

Supply

Ω

AGND1

DVDD1

DGND1

DVDD0

DGND0

0.1

µF

0.1

µF

0.1

µF

Analog

Ground

Speaker

Ground

Figure 9. Power Supply Connections

Schematic & Layout Review Service

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Schematic & Layout

Before Building Your Board.

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CS6403

DS192PP6

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