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AD1981AJST bảng dữ liệu(PDF) 11 Page - Analog Devices

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REV. 0
AD1981A
–11–
PHV[4:0]
Phone Volume: Allows setting the phone volume attenuator in 32 volume levels. The LSB represents 1.5 dB, and
the range is +12 dB to –34.5 dB. The default value is 0 dB with mute bit enabled.
PHM
Phone Mute: When this bit is set to “1,” the phone channel is muted.
Mic Volume (Index 0Eh)
MCV[4:0]
MIC Volume Gain: Allows setting the mic volume attenuator in 32 volume levels. The LSB represents 1.5 dB, and
the range is +12 dB to –34.5 dB. The default value is 0 dB with mute enabled.
M20
MIC Gain Boost: This bit allows setting additional MIC gain to increase the microphone sensitivity.
The nominal gain boost by default is 20 dB; however, bits D0 and D1 (MBG[1:0]) on the miscellaneous control
bits register (76h) allow changing the gain boost to 10 dB or 30 dB if necessary.
0 = Disabled; Gain = 0 dB
1 = Enabled; Default Gain = 20 dB (see Register 76h, bits D0, D1)
MCM
MIC Mute: When this bit is set to “1,” the MIC channel is muted.
Line In Volume (Index 10h)
Reg Num Name
D15 D14 D13
D12
D11
D10
D9
D8
D7
D6 D5
D4
D3
D2
D1
D0
Default
10h
Line In Volume
LM
X
X
LLV4 LLV3 LLV2 LLV1 LLV0 RM
* X
X RLV4 RLV3 RLV2 RLV1 RLV0 8808h
*For AC ‘97 compatibility, Bit D7 (RM) is only available by setting the MSPLT bit Register 76h. The MSPLT bit enables separate mute bits for the left and right
channels. If MSPLT is not set, RM bit has no effect.
RLV[4:0]
Line In Volume Right: Allows setting the line in right channel attenuator in 32 volume levels. The LSB represents
1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
RM
Right Channel Mute: Once enabled by the MSPLT Bit in Register 76h, this bit mutes the right channel separately
from the LM bit. Otherwise, this bit will always read “0” and will have no effect when set to “1.”
LLV[4:0]
Line In Volume Left: Allows setting the line in left channel attenuator in 32 volume levels. The LSB represents
1.5 dB, and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
LM
Line In Mute: When this bit is set to “1,” both L/R channels are muted unless the MSPLT Bit in Register 76h is
set to “1,” in which case this mute bit will only affect the left channel.
CD Volume (Index 12h)
*For AC ‘97 compatibility, Bit D7 (RM) is only available by setting the MSPLT bit Register 76h. The MSPLT bit enables separate mute bits for the left and right
channels. If MSPLT is not set, RM bit has no effect.
RCV[4:0]
Right CD Volume: Allows setting the CD right channel attenuator in 32 volume levels. The LSB represents 1.5 dB,
and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
RM
Right Channel Mute: Once enabled by the MSPLT Bit in Register 76h, this bit mutes the right channel separately
from the CM bit. Otherwise, this bit will always read “0” and will have no effect when set to “1.”
LCV[4:0]
Left CD Volume: Allows setting the CD left channel attenuator in 32 volume levels. The LSB represents 1.5 dB,
and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
CM
CD Volume Mute: When this bit is set to “1,” both L/R channels are muted, unless the MSPLT Bit in Register 76h
is set to “1,” in which case, this mute bit will only affect the left channel.
Reg Num Name
D15
D14 D13 D12 D11 D10 D9 D8 D7
D6
D5
D4
D3
D2
D1
D0
Default
0Eh
Mic Volume MCM
XXXXX
X
X
X M20 X MCV4 MCV3 MCV2 MCV1 MCV0
8008h
Reg Num Name
D15 D14 D13
D12
D11
D10
D9
D8
D7
D6 D5
D4
D3
D2
D1
D0
Default
12h
CD Volume CM
X
X
LCV4 LCV3 LCV2 LCV1 LCV0 RM
* X
X RCV4 RCV3 RCV2 RCV1 RCV0
8808h


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