WM8991 datasheet(64/174 Pages) WOLFSON

64 / 174 page

WM8991

Pre-Production

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 28 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)

ADC and DAC

Control (1)

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 29 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" section for details of DAC filter characteristics.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

DAC_SB_FILT

Selects DAC filter characteristics

0 = Normal mode

1 = Sloping stopband mode

Table 30 DAC Sloping Stopband Filter

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