WM8994ECSSLASHR datasheet(70/363 Pages) CIRRUS

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WM8994

Rev 4.6

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1540 (0604h)

DAC2 Left

Mixer Routing

ADCR_TO_DAC

Enable Sidetone STR to DAC2L

0 = Disabled

1 = Enabled

ADCL_TO_DAC

Enable Sidetone STL to DAC2L

0 = Disabled

1 = Enabled

AIF2DACL_TO_

DAC2L

Enable AIF2 (Left) to DAC2L

0 = Disabled

1 = Enabled

AIF1DAC2L_TO

_DAC2L

Enable AIF1 (Timeslot 1, Left) to

DAC2L

0 = Disabled

1 = Enabled

AIF1DAC1L_TO

_DAC2L

Enable AIF1 (Timeslot 0, Left) to

DAC2L

0 = Disabled

1 = Enabled

R1541 (0605h)

DAC2 Right

Mixer Routing

ADCR_TO_DAC

Enable Sidetone STR to DAC2R

0 = Disabled

1 = Enabled

ADCL_TO_DAC

Enable Sidetone STL to DAC2R

0 = Disabled

1 = Enabled

AIF2DACR_TO_

DAC2R

Enable AIF2 (Right) to DAC2R

0 = Disabled

1 = Enabled

AIF1DAC2R_TO

_DAC2R

Enable AIF1 (Timeslot 1, Right) to

DAC2R

0 = Disabled

1 = Enabled

AIF1DAC1R_TO

_DAC2R

Enable AIF1 (Timeslot 0, Right) to

DAC2R

0 = Disabled

1 = Enabled

Table 20 DAC Output Digital Mixing

AUDIO INTERFACE 2 (AIF2) DIGITAL MIXING

There are two output channels on AIF2. The audio source for these two channels is the same as the

selected source for DAC2L and DAC2R, as described in “DAC Output Digital Mixing”.

Note that the Left/Right channels of AIF2 can be inve

rted or interchanged if required; see “Digital

Audio Interface Control

”.

ULTRASONIC (4FS) AIF OUTPUT MODE

The WM8994 provides an ultrasonic mode on the output paths of the AIF1 audio interface. The

ultrasonic mode enables high frequency signals (such as ultrasonic microphone signals) to be output.

Ultrasonic mode is enabled on AIF1 using the AIF1ADC_4FS register bit. When the ultrasonic mode is

selected, the AIF1 output sample rate is increased by a factor of 4. For example, a 48kHz sample rate

will be output at 192kHz in ultrasonic mode.

Ultrasonic mode is only supported in AIF Master mode and uses the ADCLRCLK output (not the

LRCLK). When ultrasonic mode is enabled, AIF1 must be configured in Master mode, as described in

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