Datasheet

ADAU1381

Rev. B | Page 68 of 84

Bits[7:6], Mono Mode

These bits control the output mode of the DAC. Setting these

bits to 00 outputs two distinct channels, left and right. Setting

these bits to 01 outputs the left input channel on both the left

and right outputs, and the right input channel is lost. Setting

these bits to 10 outputs the right input channel on both the left

and right outputs, and the left input channel is lost. Setting these

bits to 11 mixes the left and right input channels and outputs

the mixed mono signal on both the left and right outputs.

Bit 5, Invert Input Polarity

This bit applies a gain of −1, or a 180° phase shift, to the DAC

output signal.

Bit 2, DAC De-Emphasis Filter Enable

This bit enables a de-emphasis filter and should be used when a

preemphasized signal is input to the DACs.

Bits[1:0], DAC Enable

These bits allow the DACs to be individually enabled or disabled.

Disabling unused DACs can result in significant power savings.

Table 56. DAC Control Register

Bits Description Default

[7:6] Mono mode 00

00: stereo output

01: both output left channel

10: both output right channel

11: both output left/right mix

5 Invert input polarity 0

0: normal

1: inverted

[4:3] Reserved

2 DAC de-emphasis filter enable 0

0: disabled

1: enabled

[1:0] DAC enable 00

00: both off

01: left on

10: right on

11: both on