WM8956 datasheet(30/80 Pages) WOLFSON

30 / 80 page

WM8956

Preliminary Technical Data

PTD, July 2007, Rev 2.1

OUTPUT MIXERS

Left and right analogue mixers allow the DAC output and analogue bypass paths to be mixed.

Programmable attenuation and mute is available on the analogue bypass paths from LINPUT3,

RINPUT3 and from the input boost mixers as shown in Figure 13. A mono mix of left and right output

mixers is also available on OUT3.

Figure 13 Output Mixer Path

Left and right mixers are enabled by the LOMIX and ROMIX register bits. The mono mixer is enabled

by OUT3 register bit, which also enables the OUT3 driver.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LOMIX

Left Output Mixer Enable Control

0 = Disabled

1 = Enabled

R47 (2Fh)

Power

Management

(3)

ROMIX

Right Output Mixer Enable Control

0 = Disabled

1 = Enabled

R26 (1Ah)

Power

Management

(2)

OUT3

Mono Output and Mono Mixer Enable

Control

0 = Mono mixer and output disabled

1 = Mono mixer and output enabled

Table 15 Output Mixer Enable Control

Inputs to the mixers from the DAC and bypass paths can be individually muted. The bypass paths

have programmable attenuation as shown in Table 16. To prevent pop noise, it is recommended not

to change volume levels of these paths during playback.

WM8956 Datasheet(PDF) 30 Page - Wolfson Microelectronics plc