WM8731SEDSSLASHRV datasheet(29/65 Pages) WOLFSON

29 / 65 page

WM8731 / WM8731L

Production Data

PD, Rev 4.9, October 2012

The software control for the line outputs is shown in Table 8.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0000100

Analogue

Audio Path

Control

BYPASS

Bypass Switch

1 = Enable Bypass

0 = Disable Bypass

DACSEL

DAC Select

1 = Select DAC

0 = Don’t select DAC

SIDETONE

Side Tone Switch

1 = Enable SideTone

0 = Disable Side Tone

Table 8 Output Software Control

The recommended external components are shown in Figure 20.

AGND

LINEOUT

Figure 20 Line Outputs Application Drawing

Recommended values are C1 = 10

F, R1 = 47k, R2 = 100 Ω.

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 WM8731/L has a stereo headphone output available on LHPOUT and RHPOUT. The output is

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

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

function.

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