Datasheet

ADAU1761
Rev. C | Page 67 of 92
R21: Right Input Digital Volume, 16,411 (0x401B)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
RADVOL[7:0]
Table 55. Right Input Digital Volume Register
Bits Bit Name Description
[7:0] RADVOL[7:0]
Controls the digital volume attenuation for right channel inputs from either the right ADC or the right digital
microphone input. Each bit corresponds to a 0.375 dB step with slewing between settings. See Table 94 for a
complete list of the volume settings.
Setting Volume Attenuation
00000000 0 dB (default)
00000001 −0.375 dB
00000010
−0.75 dB
…
…
11111110
−95.25 dB
11111111 −95.625 dB
R22: Playback Mixer Left (Mixer 3) Control 0, 16,412 (0x401C)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved MX3RM MX3LM
MX3AUXG[3:0]
MX3EN
Table 56. Playback Mixer Left (Mixer 3) Control 0 Register
Bits Bit Name Description
6 MX3RM Mixer input mute. Mutes the right DAC input to the left channel playback mixer (Mixer 3).
0 = muted (default).
1 = unmuted.
5 MX3LM Mixer input mute. Mutes the left DAC input to the left channel playback mixer (Mixer 3).
0 = muted (default).
1 = unmuted.
[4:1] MX3AUXG[3:0] Mixer input gain. Controls the left channel auxiliary input gain to the left channel playback mixer (Mixer 3).
Setting Gain
0000 Mute (default)
0001 −15 dB
0010
−12 dB
0011
−9 dB
0100
−6 dB
0101
−3 dB
0110
0 dB
0111
3 dB
1000
6 dB
0 MX3EN Mixer 3 enable.
0 = disabled (default).
1 = enabled.