WM8960CGEFLSLASHV datasheet(36/94 Pages) CIRRUS

36 / 94 page

WM8960

Rev 4.4

DAC DE-EMPHASIS

Digital de-emphasis can be applied to the DAC playback data (e.g. when the data comes from a CD

with pre-emphasis used in the recording). De-emphasis filtering is available for sample rates of 48kHz,

44.1kHz and 32kHz.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

ADC and DAC

Control (1)

2:1

DEEMPH

[1:0]

De-Emphasis Control

11 = 48kHz sample rate

10 = 44.1kHz sample rate

01 = 32kHz sample rate

00 = No de-emphasis

Table 17 DAC De-Emphasis Control

DAC OUTPUT PHASE AND MONO MIXING

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

and then converted to analogue using only one DAC, while the other DAC is switched off. The mono-

mix signal can be selected to appear on both analogue output channels. The mono mix is

automatically attenuated by 6dB to prevent clipping.

The DAC output defaults to non-inverted. Setting DACPOL[0] bit will invert the left DAC output phase

and setting DACPOL[1] bit will invert the right DAC output phase.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R6 (06h)

ADC and DAC

Control (2)

6:5

DACPOL[1:0]

DAC Polarity Control:

00 = Polarity not inverted

01 = DAC L inverted

10 = DAC R inverted

11 = DAC L and R inverted

R23 (17h)

Additional

Control (1)

DMONOMIX

DAC Mono Mix

0 = Stereo

1 = Mono (Mono MIX output on

enabled DACs)

Table 18 DAC Mono Mix and Phase Invert Select

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