WM8733

Product Preview

WOLFSON MICROELECTRONICS LTD

PP Rev 1.3 July 2000

10

RECOMMENDED EXTERNAL COMPONENTS

GND

VOUTR

CAP

VDD

SEL0

BCKIN

LRCIN

DIN

5

6

7

1

2

3

4

10

9

8

14

13

12

11

VOUTL

MUTE

SEL1

DEEMPH

SCKI

FORMAT

WM8733

GND

VDD

ANALOGUE

OUTPUT FOR

RIGHT

CHANNEL

FROM AUDIO

PROCESSOR

ANALOGUE

OUTPUT FOR

LEFT CHANNEL

256fs/384fs/512fs CLK

10µF

0.1µF

10µF

+

External

LPF

External

LPF

(diode allows automute operation)

Figure 5 Applications Diagram

DETAIL OF APPLICATION DIAGRAM SHOWING THE EXTERNAL LOW POWER FILTER

x2 for Stereo Operation

100pF

-

+

10k

Ω

1500pF

10k

Ω

680pF

10k

Ω

-

+

Vin

Filtered

Analogue

Output

External LPF

Figure 6 Third-Order Low Pass Filter (LPF) Example

An external low pass filter is recommended if the device is driving a wide band amplifier, as shown in

Figure 6. In some applications, second-order or passive RC filter may be adequate.