參數(shù)資料
型號(hào)： AD1981BLJSTZ-REEL
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： AC 97 SoundMAX Codec
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： LEAD FREE, MS-026BBC, LQFP-48
文件頁(yè)數(shù)： 16/32頁(yè)
文件大?。?/td> 326K
代理商： AD1981BLJSTZ-REEL
AD1981BL
MIC VOLUME REGISTER
Index 0x0E
Rev. A | Page 16 of 32
Reg No.
0x0E
All registers are not shown, and bits containing an X are assumed to be reserved. Refer to Table 17 for examples.
Table 16.
Bit
Mnemonic
Function
MCV [4:0]
MIC Volume Gain
Allows setting the phone volume attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the gain range is +12 dB to 34.5 dB. The default value is 0 dB, with the mute bit
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
(0x76) 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 0x76, Bits D0, D1)
MCM
MIC Mute
When this bit is set to 1, the MIC channel is muted.
Name
MIC Volume
D15
MCM
D14
X
D13
X
D12
X
D11
X
D10
X
D9
X
D8
X
D7
X
D6
M20
D5
X
D4
MCV4
D3
MCV3
D2
MCV2
D1
MCV1
D0
MCV0
Default
0x8008
Table 17. Volume Settings for Phone and MIC
Control Bits D [4:0] Phone (0x0C) and MIC (0x0E)
D15
0
0
0
1
X is a wild card, and has no effect on the value.
Write
0 0000
0 1000
1 1111
X XXXX
Readback
0 0000
0 1000
1 1111
X XXXX
Function
12 dB Gain
0 dB Gain
34.5 dB Gain
∞ db Gain, Muted
LINE-IN VOLUME REGISTER
Index 0x10
Reg No.
0x10
Name
Line-In Volume
D15
LVM
D14
X
D13
X
D12
LLV4
D11
LLV3
D10
LLV2
D9
LLV1
D8
LLV0
D7
RM
1
D6
X
D5
X
D4
RLV4
D3
RLV3
D2
RLV2
D1
RLV1
D0
RLV0
Default
0x8808
1
For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 0x76. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, the RM bit has no effect.
All registers are not shown, and bits containing an X are assumed to be reserved. Refer to Ta
Table 18.
Bit
Mnemonic
Function
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 0x76, this bit mutes the right channel separately from the
LM bit. Otherwise, this bit always reads 0 and has 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.
LVM
Line-In Mute
When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in
Register 0x76 is set to 1, in which case this mute bit affects only the left channel.
for examples.
ble 22
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參數(shù)描述
AD1981BLJSTZ-REEL2 制造商:AD 制造商全稱:Analog Devices 功能描述:AC ’97 SoundMAX㈢ Codec
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