參數(shù)資料
型號： AD1981BLJSTZ-REEL2
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)： 14/28頁
文件大?。?/td> 215K
代理商： AD1981BLJSTZ-REEL2
REV. 0
AD1981BL
–14–
RAV[4:0]
Right AUX Volume. Allows setting the AUX 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 AM bit. Otherwise, this bit will always read 0 and will have no affect when set to 1.
LAV[4:0]
Left AUX Volume. Allows setting the AUX 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.
AM
AUX 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.
ROV[4:0]
Right PCM-Out Volume. Allows setting the PCM 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 OM bit. Otherwise, this bit will always read 0 and will have no effect when set to 1.
LOV[4:0]
Left PCM-Out Volume. Allows setting the PCM 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.
OM
PCM-Out 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.
Table IV. Volume Settings for Line-In, CD Volume, AUX, and PCM-Out
Control Bits
Reg. 76h
Line-In (10h), CD (12h), AUX (16h), and PCM-Out (18h)
Left Channel Volume D[12:8]
Right Channel Volume D[4:0]
MSPLT
*
D15 Write
Readback
Function
D7
*
Write
Readback
Function
0
0
0
0
1
0
0
0
1
0
0 0000
0 1000
1 1111
x xxxx
1 1111
0 0000
0 1000
1 1111
x xxxx
1 1111
12 dB Gain
0 dB Gain
34.5 dB Gain
– dB Gain, Muted
–34.5 dB Gain
x
x
x
x
1
0 0000
0 1000
1 1111
x xxxx
x xxxx
0 0000
0 1000
1 1111
x xxxx
x xxxx
+12 dB Gain
0 dB Gain
–34.5 dB Gain
– dB Gain, Muted
– dB Gain,
Right Only Muted
–34.5 dB Gain
1
1
x xxxx
x xxxx
– dB Gain,
Left Only Muted
– dB Gain, Left Muted 1
0
1 1111
1 1111
1
1
x xxxx
x xxxx
x xxxx
x xxxx
– dB Gain, Right Muted
*
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, RM bit has no effect.
x in the above table is a wild card and has no effect on the value.
AUX Volume Register (Index 16h)
Reg
No.
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
16h
AUX Volume
AM
X
X
LAV4
LAV3
LAV2
LAV1
LAV0
RM
*
X
X
RAV4
RAV3
RAV2 RAV1 RAV0 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, 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.
PCM-Out Volume Register (Index 18h)
Reg
No. Name
D15 D14 D13 D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
18h PCM-Out Volume OM X
X
LOV4 LOV3
LOV2
LOV1
LOV0
RM
*
X
X
ROV4
ROV3
ROV2 ROV1 ROV0 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, 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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