WM8352 datasheet(78/336 Pages) WOLFSON

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WM8352

Production Data

PD, February 2011, Rev 4.4

13.7.4

DAC OUTPUT PHASE AND MONO MIXING

The digital audio data is converted to oversampled bit streams in the on-chip 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. It is also possible for the DACs to output a mono mix of left and right channels,

using DAC_MONO. Both DACs must be enabled for this mono mix to function.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R48 (30h) DAC

Control

DAC_MONO

Adds left and right channel and

halves the resulting output to

create a mono output

DACL_DATINV

DAC data left channel polarity

0 = Normal

1 = Inverted

DACR_DATINV

DAC data right channel polarity

0 = Normal

1 = Inverted

Table 35 DAC Mono Mix and Phase Invert Select

13.7.5

DAC STOPBAND ATTENUATION

The DAC digital filter type is selected by the DAC_SB_FILT register bit as shown in Table 36.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R59 (3Bh)

DAC Digital

Control

DAC_SB_FILT

Selects DAC filter characteristics

0 = Normal mode

1 = Sloping stopband mode

Table 36 DAC Filter Selection

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