AD1985 Analog Devices, AD1985 Datasheet - Page 21

• Manufacturer Part Number: AD1985
• Description: AC'97 2.3 Soundmax Codec W/jack Sensing
• Manufacturer: Analog Devices

ROV[4:0]
OMRM
LOV[4:0]
OM
AUX In Volume (Index 0x16)
Reg Num Name
0x16
*For AC ’97 compatibility, Bit D7 (AVRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right
channels. See the Volume Settings for Line In, CD Volume, AUX, and PCM Out table, above.
RAV[4:0]
AVRM
LAV[4:0]
AVM
PCM Out Volume (Index 0x18)
Reg Num Name
0x18
*For AC ’97 compatibility, Bit D7 (OMRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right
channels. See the Volume Settings for Line In, CD Volume, AUX, and PCM Out table, above.
Note that depending on the state of the AC97NC bit in
Register 0x76, this register has the following additional
functionality:
For AC97NC = 0, the register also controls the Surround,
Center, and LFE DAC Gain/Attenuators.
For AC97NC = 1, the register controls the PCM Out Volume
only.
PCM Out Vol
AUX Volume
Right PCM Out Volume. Allows setting the PCM right channel gain/attenuator to one of 32 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 0x76, 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.
Left PCM Out Volume. Allows setting the PCM left channel gain/attenuator to one of 32 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.
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 0x76 is set to 1, in which case this mute bit will only affect the left channel.
Right AUX Volume. Allows setting the AUX right channel gain/attenuator to one of 32 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 0x76, this bit mutes the right channel separately
from the AVM bit. Otherwise this bit will always read 0 and will have no effect when set to 1.
Left AUX Volume. Allows setting the AUX left channel gain/attenuator to one of 32 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.
AUX Volume 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 will only affect the left channel.
D15 D14 D13 D12 D11
OM X
D15 D14 D13 D12 D11 D10 D9
AVM X
X
X
LOV4 LOV3 LOV2 LOV1 LOV0 OMRM* X X ROV4 ROV3 ROV2 ROV1 ROV0 0x8808
LAV4 LAV3 LAV2 LAV1 LAV0 AVRM* X X RAV4 RAV3 RAV2 RAV1 RAV0 0x8808
D10
Rev. 0 | Page 21 of 48
D9
D8
D8
D7
D7
D6 D5 D4
D6 D5 D4
D3
D3
D2
D2
D1
D1
D0
D0
AD1985
Default
Default