ADAU1761BCPZ-R7 datasheet(73/93 Pages) AD

73 / 93 page

ADAU1761

Rev. C | Page 72 of 92

R28: Playback L/R Mixer Mono Output (Mixer 7) Control, 16,418 (0x4022)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reserved

MX7[1:0]

MX7EN

Table 62. Playback L/R Mixer Mono Output (Mixer 7) Control Register

Bits

Bit Name

Description

[2:1]

MX7[1:0]

L/R mono playback mixer (Mixer 7). Mixes the left and right playback mixers (Mixer 3 and Mixer 4) with either a

0 dB or 6 dB gain boost. Additionally, this mixer can operate as a common-mode output, which is used as the

virtual ground in a capless headphone configuration.

Setting

Gain Boost

Common-mode output (default)

R29: Playback Headphone Left Volume Control, 16,419 (0x4023)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

LHPVOL[5:0]

LHPM

HPEN

Table 63. Playback Headphone Left Volume Control Register

0 dB output (−6 dB gain on each of the two inputs)

6 dB output (0 dB gain on each of the two inputs)

Reserved

MX7EN

Mixer 7 enable.

0 = disabled (default).

1 = enabled.

Bits

Bit Name

Description

[7:2]

LHPVOL[5:0]

Headphone volume control for left channel, LHP output. Each 1-bit step corresponds to a 1 dB increase in volume.

See Table 95 for a complete list of the volume settings.

Setting

Volume

000000

−57 dB (default)

…

111001

0 dB

…

111111

6 dB

LHPM

Headphone mute for left channel, LHP output (active low).

0 = mute.

1 = unmute (default).

HPEN

Headphone volume control enable. Logical OR with the HPMODE bit in Register R30. If either the HPEN bit or

the HPMODE bit is set to 1, the headphone output is enabled.

0 = disabled (default).

1 = enabled.

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