WM8783 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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WM8783

Stereo Low Power 96kHz ADC

Wolfson Microelectronics plc 

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WM8783

The VMIDC capacitor is not, technically, a decoupling capacitor. However, it does serve a similar

purpose in filtering noise on the VMID reference. The connection between GND, the VMID

decoupling capacitor and the main system ground should be made at a single point as close as

possible to the GND ball of the WM8783.

Due to the wide tolerance of many types of ceramic capacitors, care must be taken to ensure that the

selected components provide the required capacitance across the required temperature and voltage

ranges in the intended application. For most application the use of ceramic capacitors with capacitor

dielectric X5R is recommended.

See Wolfson Applications Note WAN_0176 for further guidance on the choice of capacitor types.

RECOMMENDED EXTERNAL COMPONENTS DIAGRAM

Figure 10 provides a summary of recommended external components for WM8783. Note that the

actual requirements may differ according to the specific target application.

AVDD

MCLK

LRCLK

INL

INR

2 MCLK

3 LRCLK

7 INL

6 INR

AVDD 8

WM8783

GND 4

VMIDC 5

C1

4.7uF

C2

4.7uF

GND

1

ADCDAT

Figure 10 WM8783 Recommended External Components Diagram

PCB LAYOUT CONSIDERATIONS

Poor PCB layout will degrade the performance and be a contributory factor in EMI, ground bounce

and resistive voltage losses. All external components should be placed as close to the WM8783

device as possible, with current loop areas kept as small as possible.

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PD, August 2010, Rev 4.0

15

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