參數(shù)資料
型號(hào)： AD1981BL
廠商： Analog Devices, Inc.
元件分類： Codec
英文描述： AC ’97 SoundMAX㈢ Codec
中文描述： ㈢交流\u0026#39;97 SoundMAX編解碼器
文件頁數(shù)： 13/28頁
文件大?。?/td> 215K
代理商： AD1981BL
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AD1981BL
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Table III. Volume Settings for Phone and MIC
Control Bits D[4:0]
Phone (0Ch) and MIC (0Eh)
WRITE
D15
READBACK
Function
0
0
0
1
0 0000
0 1000
1 1111
x xxxx
0 0000
0 1000
1 1111
x xxxx
12 dB Gain
0 dB Gain
–34.5 dB Gain
– dB Gain, Muted
x in the above table is a wild card, and has no effect on the value.
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.
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 76h is set to 1, in which case this mute bit will affect only the left channel.
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 gain 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 CVM bit. Otherwise, this bit will always read 0 and will have no affect 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 gain range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
CVM
CD Volume Mute. When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in
Register 76h is set to 1, in which case this mute bit will affect only the left channel.
Line-In Volume Register (Index 10h)
Reg
No. Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
10h Line-In Volume LVM
X
X
LLV4 LLV3
LLV2
LLV1
LLV0
RM
*
X
X
RLV4
RLV3
RLV2
RLV1
RLV0
8808h
*
For AC ’97 compatibility, Bit D7 (RM) is available only 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, the RM bit has no effect. All registers not shown, and bits containing an X are assumed to be reserved. Refer to Table IV for examples.
CD Volume Register (Index 12h)
Reg
No. Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
12h CD Volume
CVM
X
X
LCV4 LCV3
LCV2
LCV1 LCV0 RM
*
X
X
RCV4
RCV3
RCV2
RCV1
RCV0
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, the RM bit has no effect. All registers not shown, and bits containing an X are assumed to be reserved. Refer to Table IV for examples.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1981BLJST 制造商:Analog Devices 功能描述:
AD1981BLJST-REEL 制造商:AD 制造商全稱:Analog Devices 功能描述:AC ’97 SoundMAX㈢ Codec
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AD1981BLJSTZ2 制造商:AD 制造商全稱:Analog Devices 功能描述:AC ’97 SoundMAX㈢ Codec
AD1981BLJSTZ-REEL 制造商:Analog Devices 功能描述:Audio Codec 4ADC / 2DAC 20-Bit 48-Pin LQFP T/R
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