WM8986GECOSLASHV datasheet(32/87 Pages) WOLFSON

32 / 87 page

WM8986

Pre-Production

PP, Rev 3.1, February 2007

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

DACOSR128

DAC oversampling rate:

0 = 64x (lowest power)

1 = 128x (best performance)

R10 (0Ah)

DAC Control

SOFTMUTE

Softmute enable:

0 = Enabled

1 = Disabled

Table 11 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

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:0

DACLVOL

[7:0]

11111111

( 0dB )

Left DAC Digital Volume Control

0000 0000 = Digital Mute

0000 0001 = -127dB

0000 0010 = -126.5dB

... 0.5dB steps up to

1111 1111 = 0dB

R11 (0Bh)

Left DAC

Digital Volume

DACVU

Not

latched

DAC left and DAC right volume do

not update until a 1 is written to

DACVU (in reg 11 or 12)

7:0

DACRVOL

[7:0]

11111111

( 0dB )

Right DAC Digital Volume Control

0000 0000 = Digital Mute

0000 0001 = -127dB

0000 0010 = -126.5dB

... 0.5dB steps up to

1111 1111 = 0dB

R12 (0Ch)

Right DAC

Digital Volume

DACVU

Not

latched

DAC left and DAC right volume do

not update until a 1 is written to

DACVU (in reg 11 or 12)

Table 12 DAC Digital Volume Control

WM8986GECO/V Datasheet(PDF) 32 Page - Wolfson Microelectronics plc

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