Datasheet

ADAU1361
Rev. C | Page 66 of 80
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 55. 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
00 Common-mode output (default)
01 0 dB output (−6 dB gain on each of the two inputs)
10
6 dB output (0 dB gain on each of the two inputs)
11
Reserved
0 MX7EN Mixer 7 enable.
0 = disabled (default).
1 = enabled.
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 56. Playback Headphone Left Volume Control Register
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 74 for a complete list of the volume settings.
Setting Volume
000000 −57 dB (default)
… …
111001
0 dB
…
…
111111
6 dB
1 LHPM Headphone mute for left channel, LHP output (active low).
0 = mute.
1 = unmute (default).
0 HPEN Headphone output enable.
0 = disabled (default).
1 = enabled.