WM8983GEFLSLASHV datasheet(57/123 Pages) WOLFSON

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Production Data

WM8983

PD Rev 4.0 November 2006

The analogue outputs from the DACs can then be mixed with the aux analogue inputs and the ADC

analogue inputs. The mix is fed to the output drivers for headphone (LOUT1/ROUT1,

LOUT2/ROUT2) or line (OUT3/OUT4). OUT3 and OUT4 have additional mixers which allow them to

output different signals to the headphone and line outputs.

DIGITAL PLAYBACK (DAC) PATH

Digital data is passed to the WM8983 via the flexible audio interface and is then passed through a

variety of advanced digital filters as shown in Figure 30 to the hi-fi DACs. The DACs are enabled by

the DACENL/R register bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DACENL

Left channel DAC enable

0 = DAC disabled

1 = DAC enabled

Power

Management 3

DACENR

Right channel DAC enable

0 = DAC disabled

1 = DAC enabled

Table 28 DAC Enable Control

The WM8983 also has a Soft Mute function, which when enabled, gradually attenuates the volume

of the digital signal to zero. When disabled, the gain will ramp back up to the digital gain setting. This

function is enabled by default. To play back an audio signal, it must first be disabled by setting the

SOFTMUTE bit to zero.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DACPOL

Left DAC output polarity:

0 = non-inverted

1 = inverted (180 degrees phase shift)

DACRPOL

Right DAC output polarity:

0 = non-inverted

1 = inverted (180 degrees phase shift)

AMUTE

Automute enable

0 = Amute disabled

1 = Amute enabled

DACOSR

DAC oversampling rate:

0 = 64x (lowest power)

1 = 128x (best performance)

R10

DAC Control

SOFTMUTE

Softmute enable:

0 = Enabled

1 = Disabled

Table 29 DAC Control Register

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

interpolation filters. The bitstream data enters the multi-bit, sigma-delta DACs, which convert it to a

high quality analogue audio signal. 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.

The DAC output phase defaults to non-inverted. Setting DACLPOL will invert the DAC output phase

on the left channel and DACRPOL inverts the phase on the right channel.

AUTO-MUTE

The DAC has an auto-mute function which applies an analogue mute when 1024 consecutive zeros

are detected. The mute is released as soon as a non-zero sample is detected. Auto-mute can be

disabled using the AMUTE control bit.

DIGITAL HI-FI DAC VOLUME (GAIN) CONTROL

The signal volume from each Hi-Fi DAC can be controlled digitally. The gain range is –127dB to 0dB

in 0.5dB steps. The level of attenuation for an eight-bit code X is given by:

0.5

× (X-255) dB for 1 ≤ X ≤ 255;

MUTE for X = 0

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