WM8993 datasheet(65/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

DAC DE-EMPHASIS

Digital de-emphasis can be applied to the DAC playback data; this is appropriate when the data

source is a CD where pre-emphasis is 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 CTRL

5:4

DEEMPH

[1:0]

DAC De-Emphasis Control

00 = No de-emphasis

01 = 32kHz sample rate

10 = 44.1kHz sample rate

11 = 48kHz sample rate

Table 36 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.

The DAC filter type is determined automatically by the WM8993 in Automatic Clocking Configuration

mode. The DAC_SB_FILT register bit is only effective in Manual Clocking Configuration mode. See

“Clocking and Sample Rates” for details of the Clocking Configuration mode selection.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

DAC CTRL

DAC_SB_FILT

Selects DAC filter characteristics

0 = Normal mode

1 = Sloping stopband mode

Note - this field is ignored and invalid

in Automatic Clocking Configuration

mode.

Table 37 DAC Sloping Stopband Filter

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