WM8983 datasheet(77/129 Pages) CIRRUS

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WM8983

Rev 4.6

OUTPUT PHASING

The relative phases of the analogue outputs will depend upon the following factors:

DACLPOL and DACRPOL invert bits: Setting these bits to 1 will invert the DAC output.

Mixer configuration: The polarity of the signal will depend upon the route through the mixer path.

For example, DACL can be directly input to the OUT3 mixer, giving a 180° phase shift at the

OUT3 mixer output. However, if DACL is input to the OUT3 mixer via the left mixer, an additional

phase shift will be introduced, giving 0° phase shift at the OUT3 mixer output.

Output boost set-up: When 1.5x boost is enabled on an output, no phase shift occurs. When

1.5x boost is not enabled, a 180° phase shift occurs.

Figure 32 shows where these phase inversions can occur in the output signal path.

OUT3

LOUT1

ROUT1

LOUT2

ROUT2

OUT4

Boost

DAC

Bypass L

Bypass R

AUX L

AUX R

Phase depends on usage mode

No phase inversion

Phase inversion

Output Boost

stages will

invert in 1x

mode, not in

1.5x mode

DACs have

programmable

invert option

BTL

BTL Mode

adds an

extra stage

of inversion

Boost

OUT4

Mixer

OUT3

Mixer

Left

Mixer

Right

Mixer

Non-BTL

Figure 40 Output Signal Path Phasing

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