WM8956CGEFLSLASHV datasheet(27/80 Pages) WOLFSON

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Production Data

WM8956

PD, November 2011, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

DAC Control (1)

DACMU

Digital Soft Mute

1 = Mute

0 = No mute (signal active)

R6 (06h)

DAC Control (2)

DACSMM

DAC Soft Mute Mode

0 = Disabling soft-mute (DACMU=0)

will cause the volume to change

immediately to the LDACVOL /

RDACVOL settings

1 = Disabling soft-mute (DACMU=0)

will cause the volume to ramp up

gradually to the LDACVOL /

RDACVOL settings

DACMR

DAC Soft Mute Ramp Rate

0 = Fast ramp (fs/2, providing

maximum delay of 10.7ms at fs=48k)

1 = Slow ramp (fs/32, providing

maximum delay of 171ms at fs=48k)

Table 10 DAC Soft-Mute Control

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.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

DAC Control (1)

2:1

DEEMPH

[1:0]

De-Emphasis Control

11 = 48kHz sample rate

10 = 44.1kHz sample rate

01 = 32kHz sample rate

00 = No de-emphasis

Table 11 DAC De-Emphasis Control

DAC OUTPUT PHASE AND MONO MIXING

The digital audio data is converted to oversampled bit streams in the on-chip, true 24-bit digital

interpolation filters. The bitstream data enters two multi-bit, sigma-delta DACs, which convert them to

high quality analogue audio signals. The multi-bit DAC architecture reduces high frequency noise and

sensitivity to clock jitter. It also uses a Dynamic Element Matching technique for high linearity and low

distortion.

In normal operation, the left and right channel digital audio data is converted to analogue in two

separate DACs. There is a mono-mix mode where the two audio channels are mixed together digitally

and then converted to analogue using only one DAC, while the other DAC is switched off. The mono-

mix signal can be selected to appear on both analogue output channels. The mono mix is

automatically attenuated by 6dB to prevent clipping.

The DAC output defaults to non-inverted. Setting DACPOL[0] bit will invert the left DAC output phase

and setting DACPOL[1] bit will invert the right DAC output phase.

WM8956CGEFL/V Datasheet(PDF) 27 Page - Wolfson Microelectronics plc

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