WM8734 datasheet(36/46 Pages) WOLFSON

36 / 46 page

WM8734

Production Data

PD Rev 4.1 November 2006

The complete register map is shown in Table 21. The detailed description can be found in the

relevant text of the device description. There are 8 registers with 9 bits per register. These can be

controlled using either the 2 wire or 3 wire MPU interface.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

LINVOL[4:0]

10111

( 0dB )

Left Channel Line Input Volume

Control

11111 = +12dB . . 1.5dB steps down

to 00000 = -34.5dB

LINMUTE

Left Channel Line Input Mute to ADC

1 = Enable Mute

0 = Disable Mute

0000000

Left Line In

LRINBOTH

Left to Right Channel Line Input

Volume and Mute Data Load Control

1 = Enable Simultaneous Load of

LINVOL[4:0] and LINMUTE to

RINVOL[4:0] and RINMUTE

0 = Disable Simultaneous Load

4:0

RINVOL[4:0]

10111

( 0dB )

Right Channel Line Input Volume

Control

11111 = +12dB . .1.5dB steps down

to 00000 = -34.5dB

RINMUTE

Right Channel Line Input Mute to

ADC

1 = Enable Mute

0 = Disable Mute

0000001

Right Line In

RLINBOTH

Right to Left Channel Line Input

Volume and Mute Data Load Control

1 = Enable Simultaneous Load of

RINVOL[4:0] and RINMUTE to

LINVOL[4:0] and LINMUTE

0 = Disable Simultaneous Load

0000100

Analogue Audio

Path Control

DACSEL

DAC Select

1 =Select DAC

0 = Don’t select DAC

ADCHPD

ADC High Pass Filter Enable

1 = Enable High Pass Filter

0 = Disable High Pass Filter

2:1

DEEMP[1:0]

De-emphasis Control

11 = 48kHz

10 = 44.1kHz

01 = 32kHz

00 = Disable

DACMU

DAC Soft Mute Control

1 = Enable soft mute

0 = Disable soft mute

0000101

Digital Audio

Path Control

HPOR

Store dc offset when High Pass Filter

disabled

1 = store offset

0 = clear offset

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