WM8742GEDSSLASHV datasheet(37/66 Pages) CIRRUS

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WM8742

Rev 4.4

DIFFERENTIAL MONO MODE

DIFF[1:0] sets the required differential output mode; normal stereo, reversed stereo, mono left or

mono right, as shown in Table 36.

BIT

LABEL

DEFAULT

DESCRIPTION

Mode Control 2

08h

[3:2]

DIFF[1:0]

00 = Stereo

10 = Stereo reverse (left and right

channels swapped)

01 = Mono left

– differential outputs

VOUTLP (17) is left channel.

VOUTLN (16) is left channel

inverted.

VOUTRP (12) is left channel

inverted.

VOUTRN (13) is left channel.

11 = Mono right

– differential outputs.

VOUTLP (17) is right channel

inverted.

VOUTLN (16) is right channel.

VOUTRP (12) is right channel.

VOUTRN (13) is right channel

inverted.

Table 36 Differential Output Modes

Using these controls a pair of WM8742 devices may be used to build a dual differential stereo

implementation with higher performance and differential output.

DITHER

Dither is applied whenever internal truncation occurs. It is also used when a 32 bit input word is

applied to the DAC prior to truncation to the internal wordlength. Three types of dither can be selected

to allow the sound quality if the device to be optimised.

TDF has a triangular probability density function and causes zero noise modulation i.e.

the

quantisation noise is invariant to the changes in the signal level. This mode is recommended and is

selected by default.

RPDF has a rectangular probability density function and may cause noise modulation.

HPDF has a triangular probability density function with a high pass characteristic, which has a lower

noise at low frequencies at the expense of raised noise levels at higher frequencies.

Alternatively the dither can be disabled.

BIT

LABEL

DEFAULT

DESCRIPTION

Mode Control 2

08h

[1:0]

DITHER

[1:0]

Digital filter dither mode select:

00 = dither off

01 = RPDF dither applied in Digital

filter

10 = TPDF dither applied in Digital

filter

11 = HPDF dither applied in Digital

filter

Note: DITHER[1:0] applies only to the

dither mode in the Digital filter.

Table 37 Dither Control

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