AD1981BL Analog Devices, AD1981BL Datasheet - Page 13

• Manufacturer Part Number: AD1981BL
• Description: Low Voltage AC'97 Soundmax Codec
• Manufacturer: Analog Devices

*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
RLV[4:0]
RM
LLV[4:0]
LVM
*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
RCV[4:0]
RM
LCV[4:0]
CVM
REV. 0
Reg
No. Name
10h Line-In Volume LVM X
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.
Reg
No. Name
12h CD Volume
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.
Right CD Volume. Allows setting the CD right channel attenuator in 32 volume levels. The LSB represents 1.5 dB,
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.
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.
and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
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 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.
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.
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.
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.
D15
D15
CVM X
D14 D13 D12
D14 D13 D12
D15
0
0
0
1
x in the above table is a wild card, and has no effect on the value.
X
X
LLV4 LLV3 LLV2 LLV1 LLV0 RM* X
LCV4 LCV3 LCV2 LCV1 LCV0 RM* X
WRITE
0 0000
0 1000
1 1111
x xxxx
Table III. Volume Settings for Phone and MIC
Phone (0Ch) and MIC (0Eh)
D11
D11
Line-In Volume Register (Index 10h)
Control Bits D[4:0]
CD Volume Register (Index 12h)
D10
D10
D9
D9
READBACK
0 0000
0 1000
1 1111
x xxxx
–13–
D8
D8
D7
D7
D6
D6
D5
X
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
– dB Gain, Muted
X
D5
D4
RLV4
D4
RCV4 RCV3 RCV2 RCV1 RCV0 8808h
RLV3
D3
D3
D2
RLV2 RLV1 RLV0 8808h
D2
D1
D1
AD1981BL
D0
D0
Default
Default