WM8711SEDSSLASHR datasheet(19/47 Pages) WOLFSON

19 / 47 page

Production Data

WM8711 / WM8711L

PD Rev 4.3 September 2006

The software control for the line outputs is shown in Table 4.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

BYPASS

Bypass Switch

1 = Enable Bypass

0 = Disable Bypass

0000100

Analogue

Audio Path

Control

DACSEL

DAC Select

1 = Select DAC

0 = Don’t select DAC

Table 4 Output Software Control

The recommended external components are shown in Figure 9.

AGND

LINEOUT

Figure 9 Line Outputs Application Drawing

Recommended values are C1 = 10

µF, R1 = 47k, R2 = 100Ω

C1 forms a DC blocking capacitor to the line outputs. R1 prevents the output voltage from drifting so

protecting equipment connected to the line output. R2 forms a de-coupling resistor preventing

abnormal loads from disturbing the device. Note that poor choice of dielectric material for C1 can

have dramatic effects on the measured signal distortion at the output.

HEADPHONE AMPLIFIER

The WM8711/L has a stereo headphone output available on LHPOUT and RHPOUT. The output is

designed specifically for driving 16 or 32 ohm headphones with maximum efficiency and low power

consumption. The headphone output includes a high quality volume level adjustment and mute

function.

WM8711SEDS/R 데이터시트(PDF) 19 Page - Wolfson Microelectronics plc