WM8959 datasheet(55/155 Pages) WOLFSON

55 / 155 page

Pre-Production

WM8959

PP, May 2008, Rev 3.1

DAC MONO MIX

A DAC digital mono-mix mode can be enabled using the DAC_MONO register bit. This mono mix will

be output on the enabled DACs. To prevent clipping, a -6dB attenuation is automatically applied to

the mono mix.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

DAC_MONO

DAC Mono Mix

0 = Stereo

1 = Mono (Mono mix output on

enabled DACs)

Table 20 DAC Mono Mix

DAC DE-EMPHASIS

Digital de-emphasis can be applied to the DAC playback data (e.g. when the data comes from a CD

with pre-emphasis used in the recording). De-emphasis filtering is available for sample rates of

48kHz, 44.1kHz and 32kHz. See "Digital Filter Characteristics" section for details of de-emphasis

filter characteristics.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

DAC Control

5:4

DEEMP

[1:0]

00b

DAC De-Emphasis Control

00 = No de-emphasis

01 = 32kHz sample rate

10 = 44.1kHz sample rate

11 = 48kHz sample rate

Table 21 DAC De-Emphasis Control

DAC SLOPING STOPBAND FILTER

Two DAC filter types are available, selected by the register bit DAC_SB_FILT. When operating at

lower sample rates (e.g. during voice communication) it is recommended that the sloping stopband

filter type is selected (DAC_SB_FILT=1) to reduce out-of-band noise which can be audible at low

DAC sample rates. See "Digital Filter Characteristics" for details of DAC filter characteristics.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

DAC Control

DAC_SB_FILT

Selects DAC filter characteristics

0 = Normal mode

1 = Sloping stopband mode

Table 22 DAC Sloping Stopband Filter

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