CDB6403 查看數據表（PDF） - Cirrus Logic
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CDB6403 Datasheet PDF : 54 Pages
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CS6403
2Ω
DVDD0
AVDD
+
1 µF
0.1 µF DVDD1
DGND1
CS6403
AGND0
PVDD
0.1 µF
+ 1 µF
+5V
+ Analog
10 µF Supply
DGND0
PGND0
0.1 µF
+ 1 µF
PGND1
AGND1
0.1 µF
Analog Speaker
Ground Ground
Figure 9. Power Supply Connections
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 2Ω resistor
from the clean system analog supply, and should
not be connected directly to the board-level digi-
tal 5V supply.
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.
Grounding and Layout
Embedded Signal-Processing Functions
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.
As shown in Figure 3, the CS6403 provides sev-
eral processing functions that are required for
good full-duplex, hands-free performance.
Schematic & Layout Review Service
Confirm Optimum
Schematic & Layout
Before Building Your Board.
For Our Free Review Service
Call Applications Engineering.
Call: (512) 445-7222
DS192PP6
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