WM8170 datasheet(39/41 Pages) WOLFSON

39 / 41 page

WM8170

Product Preview Rev 1.0

WOLFSON MICROELECTRONICS LTD

PP Rev 1.0 March 2000

RECOMMENDED EXTERNAL COMPONENTS

DEVICE DECOUPLING

The WM8170 contains a high speed 10-bit ADC and wide bandwidth signal amplifiers that are

sensitive to noise on supply pins, reference pins and elsewhere. Therefore particular attention should

be paid to the decoupling of the WM8170 to prevent unwanted noise from entering the signal path.

Figure 27 and Table 16 show the recommended decoupling capacitors and ground connections. Note

that the analogue and digital ground pins are each connected to their respective separate analogue

and digital ground return paths. Each analogue supply pin is decoupled to the analogue ground with a

parallel combination of tantalum and ceramic capacitors. Each digital supply pin is decoupled to the

digital ground with the same parallel capacitor combination.

For optimum performance each parallel capacitor combination should be connected as close to the

particular supply pin as is physically possible.

The careful use of separate analogue and digital ground planes can help to prevent coupling of digital

noise into the sensitive analogue sections of the internal device circuitry. The AGND and DGND

connections should be star-pointed as close to the WM8170 as possible.

WM8170

DGND2

CGND

VOUT2

CVDD

VOUT1

DVDD1

DCLK

SCK/RNW

SEN/STB

SDI/DNA

DVDD3

SDO

NRESET

OEB

PDB/VD

PNS

DGND1

BLCENB

PBLK/HD

CLPENB

CLPSWB

DVDD2

SHP

SHD

AVDD2

DIN

AGND2

VMID

VRB

VRT

ISET

AGND1

AVDD1

AVDD3

VCLP

PTDO

DVDD4

CNR

CIN

C16

C15

C14

C13

C12

C11

C10

AGND

AVDD

FB4

FB3

DGND

DVDD

FB2

FB1

Figure 27 WM8170 External Components

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