Datasheet

ADAU1761
Rev. C | Page 73 of 92
R30: Playback Headphone Right Volume Control, 16,420 (0x4024)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
RHPVOL[5:0] RHPM
HPMODE
Table 64. Playback Headphone Right Volume Control Register
Bits Bit Name Description
[7:2] RHPVOL[5:0]
Headphone volume control for right channel, RHP 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
1 RHPM Headphone mute for right channel, RHP output (active low).
0 = mute.
1 = unmute (default).
0 HPMODE
RHP and LHP output mode. These pins can be configured for either line outputs or headphone outputs. Logical
OR with the HPEN bit in Register R29. If either the HPMODE bit or the HPEN bit is set to 1, the headphone output
is enabled.
0 = enable line output (default).
1 = enable headphone output.
R31: Playback Line Output Left Volume Control, 16,421 (0x4025)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
LOUTVOL[5:0]
LOUTM LOMODE
Table 65. Playback Line Output Left Volume Control Register
Bits Bit Name Description
[7:2] LOUTVOL[5:0]
Line output volume control for left channel, LOUTN and LOUTP outputs. 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
1 LOUTM Line output mute for left channel, LOUTN and LOUTP outputs (active low).
0 = mute.
1 = unmute (default).
0 LOMODE
Line output mode for left channel, LOUTN and LOUTP outputs. These pins can be configured for either line
outputs or headphone outputs. To drive earpiece speakers, set this bit to 1 (headphone output).
0 = line output (default).
1 = headphone output.