WM8753LGEBSLASHV datasheet(39/92 Pages) WOLFSON

39 / 92 page

WM8753L

Pre-Production

PP Rev 3.4 November 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:1

DEEMP

[1:0]

De-emphasis Control

11 = 48kHz sample rate

10 = 44.1kHz sample rate

01 = 32kHz sample rate

00 = No De-emphasis

R1 (01h)

DAC Control

DACMU

Digital Soft Mute

1 = mute

0 = no mute (signal active)

Table 28 HiFi DAC Control

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 also a mono-mix mode where the two audio channels are mixed together

digitally, controlled by the DMONOMIX register bits which allow the digital mono mix to be applied to

left, right or both DAC channels. If only one DAC channel is being used for the mono mix the other

can be powered down.

The DAC output defaults to non-inverted. Setting DACINV will invert the DAC output phase on both

left and right channels.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

5:4

DMONOMIX

[1:0]

DAC Mono Mix

00: stereo

01: mono ((L+R)/2) into DACL, ‘0’ into

DACR

10: mono ((L+R)/2) into DACR, ‘0’ into

DACL

11: mono ((L+R)/2) into DACL and

DACR

R1 (01h)

DAC Control

DACINV

DAC Phase Invert

0 : non-inverted

1 : inverted

Table 29 HiFi DAC Mono Mix and Phase Invert Select

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