AD1881A
PC Beep Register (Index 0Ah)
Reg
Name
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D0 Default
D3
D2
D1
Num
0Ah
PC_BEEP Volume PCM
X
X
X
X
X
X
X
X
PCV3 PCV2 PCV1 PCV0 X 8000h
PCV[3:0]
PC Beep Volume Control. The least significant bit represents 3 dB attenuation. This register controls the output
from 0 dB to a maximum attenuation of –45 dB. The PC Beep is routed to Left and Right Line outputs even when
the RESET pin is asserted. This is so that Power on Self-Test (POST) codes can be heard by the user in case of a
hardware problem with the PC.
PCM
PC Beep Mute. When this bit is set to “1,” the channel is muted.
PCM
PCV3 . . . PCV0
Function
0
0
1
0000
1111
xxxx
0 dB Attenuation
–45 dB Attenuation
–∞ dB Attenuation
Phone Volume (Index 0Ch)
Reg
Name
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4
D3
D2
D1
D0
Default
Num
0Ch
Phone Volume PHM
X
X
X
X
X
X
X
X
PHV4 PHV3 PHV2 PHV1 PHV0 8008h
PHV[4:0]
PHM
Phone Volume. Allows setting the Phone Volume Attenuator in 32 steps. The LSB represents 1.5 dB, and the
range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Phone Mute. When this bit is set to “1,” the channel is muted.
MIC Volume (Index 0Eh)
Reg
Num
Name
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6
M20
D5 D4
D3
D2
D1
D0
Default
0Eh Mic Volume MCM
X
X
X
X
X
X
X
X
X MCV4 MCV3 MCV2 MCV1 MCV0 8008h
MCV[4:0]
M20
MIC Volume Gain. Allows setting the MIC Volume attenuator in 32 steps. The LSB represents 1.5 dB, and the
range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Microphone 20 dB Gain Block
0 = Disabled; Gain = 0 dB.
1 = Enabled; Gain = 20 dB.
MCM
MIC Mute. When this bit is set to “1,” the channel is muted.
Line In Volume (Index 10h)
Reg
Name
D15 D14 D13 D12
D11
D10
D9
D8
D7 D6 D5 D4
D3
D2
D1
D0
Default
Num
10h
Line InVolume LM
X
X
LLV4 LLV3 LLV2 LLV1 LLV0
X
X
X
RLV4 RLV3 RLV2 RLV1 RLV0 8808h
RLV[4:0]
LLV[4:0]
LM
Right Line In Volume. Allows setting the Line In right channel attenuator in 32 steps. The LSB represents 1.5 dB,
and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Line In Volume Left. Allows setting the Line In left channel attenuator in 32 steps. The LSB represents 1.5 dB, and
the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Line In Mute. When this bit is set to “1,” the channel is muted.
REV. 0
–13–
ADI [ ADI ]
