WM8738

Production Data

w

PD Rev 4.3 November 2004

13

APPLICATIONS INFORMATION

RECOMMENDED EXTERNAL COMPONENTS

DVDD

DGND

AVDD

CAP

C

12

C

11

AGND

1

14

Hardware

Control

WM8738

C

2

DVDD

C

1

4

FMT

AVDD

13

MCLK

3

BCLK

12

LRCLK

2

SDATO

Audio Serial Data I/F

AGND

9

+

5

+

+

11

NOHP

AGND

10

C

RIN

7

VREF

C

10

C

9

AGND

6

+

7

Notes:

1.

AGND and DGND should be connected as close to the WM8738 as possible.

2.

C

should be positioned as close to the WM8738 as possible.

3.

Capacitor types should be carefully chosen. Capacitors with very low ESR are recommended for optimum

performance.

C

4

C

3

LIN

5

C

8

DVDD

DVDD

6

C

C

8

R

1

R

4

R

2

R

3

Figure 9 External Components Diagram

RECOMMENDED EXTERNAL COMPONENTS VALUES

COMPONENT

REFERENCE

SUGGESTED

VALUE

DESCRIPTION

C1 and C4

10

µF

De-coupling for DVDD and AVDD

C2 and C3

0.1

µF

De-coupling for DVDD and AVDD

C5 and C7

1

µF

Analogue input AC coupling caps

C6 and C8

4.7nF

Analogue input filtering (RC) capacitor

R2 and R3

10k

Ω

Current limiting resistors

R1 and R4

680

Ω

Analogue input filtering (RC) resistor

C9

0.1

µF

C10

10

µF

Reference de-coupling capacitors for VREF pin

C11

0.1

µF

C12

10

µF

Reference de-coupling capacitors for CAP pin

Table 3 External Components Description