WM8758CBGEFLSLASHV datasheet(43/90 Pages) WOLFSON

43 / 90 page

Production Data

WM8758B

PD, Rev 4.4, January 2012

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10

DAC Control

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 & best

performance)

1 = 128x

SOFTMUTE

Softmute enable:

0 = Enabled

1 = Disabled

Table 21 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

WM8758CBGEFL/V Datasheet(PDF) 43 Page - Wolfson Microelectronics plc

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