參數(shù)資料
型號： 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
文件頁數(shù)： 14/32頁
文件大小： 326K
代理商： AD1981BLJSTZ-REEL
AD1981BL
HEADPHONE VOLUME REGISTER
Index 0x04
This register controls the headphone volume controls for both stereo channels and the mute bit. Each volume subregister contains five
bits, generating 32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility,
whenever the D5 or D13 bits are set to 1, their respective lower five volume bits are automatically set to 1 by the codec logic. On readback,
all lower five bits read 1s whenever these bits are set to 1. Refer to Table 12 for examples.
Rev. A | Page 14 of 32
Reg
No.
0x04
Name
Headphone
Volume
D15
HPM
D14
X
D13
X
D12
LHV4
D11
LHV3
D10
LHV2
D9
LHV1
D8
LHV0
D7
RM
1
D6
X
D5
X
D4
RHV4
D3
RHV3
D2
RHV2
D1
RHV1
D0
RHV0
Default
0x8000
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.
Table 11.
Bit
RHV [4:0]
Mnemonic
Right Headphone
Volume Control
Right-Channel Mute
Function
The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a maximum
attenuation of 46.5 dB.
Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel separately from the
HPM bit. Otherwise, this bit always reads 0 and has no effect when set to 1.
The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a maximum
attenuation of 46.5 dB.
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.
RM
LHV [4:0]
Left Headphone
Volume Control
Headphone Volume
Mute
HPM
Table 12. Volume Settings for Master and Headphone
Reg. 0x76
Control Bits Master Volume (0x02) and Headphone Volume (0x04)
Left-Channel Volume D [13:8]
Readback
Function
00 0000
0 dB Gain
00 1111
22.5 dB Gain
01 1111
46.5 dB Gain
01 1111
46.5 dB Gain
XX XXXX
∞ dB Gain, Muted
01 1111
46.5 dB Gain
XX XXXX
∞ dB Gain, Left Only Muted
XX XXXX
∞ dB Gain, Left Muted
Right-Channel Volume D [5:0]
Readback
00 0000
00 1111
01 1111
01 1111
XX XXXX
XX XXXX
XX XXXX
XX XXXX
MSPLT
1
0
0
0
0
0
1
1
1
D15
0
0
0
0
1
0
1
1
Write
00 0000
00 1111
01 1111
1X XXXX
XX XXXX
1X XXXX
XX XXXX
XX XXXX
D7
1
X
X
X
X
X
1
0
1
Write
00 0000
00 1111
01 1111
1X XXXX
XX XXXX
XX XXXX
XX XXXX
XX XXXX
Function
0 dB Gain
22.5 dB Gain
46.5 dB Gain
46.5 dB Gain
∞ dB Gain, Muted
∞ dB Gain, Right Only Muted
46.5 dB Gain
∞ dB Gain, Right Muted
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.
X is a wild card, and has no effect on the value.
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相關(guān)代理商/技術(shù)參數(shù)
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
AD1981BWBSTZ 制造商:Analog Devices 功能描述:
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AD1981HD 制造商:AD 制造商全稱:Analog Devices 功能描述:HD Audio SoundMAX Codec
AD1981HDJSTZ 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 20-Bit/24-Bit 48-Pin LQFP
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