WM8720

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 3.0 November 2000

14

RECOMMENDED EXTERNAL COMPONENTS

NOTES:

1. AGND and DGND should be connected as close to the WM8720 as possible.

2. C

3. Capacitor types should be carefully chosen. Capacitors with very low ESR are

recommended for optimum performance.

4

DVDD

DGND

ML/I2S

AVDD

13

CAP

C

8

C

7

AGND

19

20

Software I/F or

Hardware Control Pins

AGND

C

3

C

4

C

2

DVDD

C

1

5

MC/IWL

6

MD/DM

VOUTR

12

C

5

VOUTL

C

6

AC-Coupled

Output to

External LPF

18

MODE

9

17

MUTE

2

SCKI

15

DIN

16

LRCIN

Audio Serial Data I/F

DGND

AGND

7

RSTB

14

BCKIN

10

11

8

ZERO

AVDD

AVDD

R1

3

TEST

1

PWDN

+

+

+

+

+

Figure 8 External Components Diagram

RECOMMENDED EXTERNAL COMPONENTS VALUES

COMPONENT

REFERENCE

SUGGESTED

VALUE

DESCRIPTION

C1 and C4

10

µF

C2 and C3

0.1

µF

C5 and C6

10

µF

Output AC coupling caps to remove midrail DC level from outputs.

C7

0.1

µF

C8

10

µF

Reference de-coupling capacitors for CAP pin.

R1

10k

Ω

Resistor to AVDD for open drain output operation.

Table 13 External Components Description