WM8731 datasheet(19/56 Pages) WOLFSON

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WM8731

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 2.0 February 2001

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

Table 2 Line Input Software Control

The line inputs are biased internally through the operational amplifier to VMID. Whenever the line

inputs are muted or the device placed into standby mode, the line inputs are kept biased to VMID

using special anti-thump circuitry. This reduces any audible clicks that may otherwise be heard when

re-activating the inputs.

The external components required to complete the line input application is shown in the Figure 10.

AGND

LINEIN

Figure 10 Line Input Application Drawing

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