AD1985 Analog Devices, AD1985 Datasheet - Page 20

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

AD1985
Line In Volume (Index 0x10)
Reg Num Name
0x10
*For AC ’97 compatibility, Bit D7 (LVRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right
channels.
RLV[4:0]
LVRM
LLV[4:0]
LM
Volume Settings for Line In, CD Volume, AUX, and PCM Out
Reg. 0x76
MSPLT*
0
0
0
0
1
1
1
*For AC ’97 compatibility, Bit D7 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, RM bit has no effect.
Note: x in the above table is a wild card, meaning the value has no effect.
CD Volume (Index 0x12)
Reg Num Name
0x12
*For AC97 compatibility, Bit D7 (CDRM) 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.
RCV[4:0]
CDRM
LCV[4:0]
CM
Line In Volume
CD Volume
D15
0
0
0
1
0
1
1
WRITE
0 0000
0 1000
1 1111
x xxxx
1 1111
x xxxx
x xxxx
D15 D14 D13 D12 D11 D10 D9
CM X
Right Line In Volume. Allows setting the line in 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 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 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.
Line In 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 affect only the left channel.
Right CD Volume. Allows setting the CD 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 CM bit. Otherwise this bit will always read 0 and will have no effect when set to 1.
Left CD Volume. Allows setting the CD 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.
CD 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.
Left Channel Volume D[12:8]
READBACK
0 0000
0 1000
1 1111
x xxxx
1 1111
x xxxx
x xxxx
D15 D14 D13 D12 D11 D10 D9
LM X
X
X
LCV4 LCV3 LCV2 LCV1 LCV0 CDRM* X
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
–∞ dB Gain, Muted
–34.5 dB Gain
–∞ dB Gain, Left Muted
Line In (0x10), CD (0x12), AUX (0x16), and PCM Out (0x18)
–∞ dB Gain, Only Left Muted
LLV4 LLV3 LLV2 LLV1 LLV0 LVRM* X
Rev. 0 | Page 20 of 48
Control Bits
D8
D8
D7*
x
x
x
x
1
0
1
D7
D7
x xxxx
x xxxx
x xxxx
WRITE
0 0000
0 1000
1 1111
1 1111
D6 D5 D4
D6 D5 D4
X
X RLV4 RLV3 RLV2 RLV1 RLV0 0x8808
Right Channel Volume D[4:0]
READBACK
0 0000
0 1000
1 1111
x xxxx
x xxxx
1 1111
x xxxx
RCV4 RCV3 RCV2 RCV1 RCV0 0x8808
D3
D3
D2
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
–∞
–∞
–34.5 dB Gain
–∞
D2
dB Gain, Muted
dB Gain, Only Right Muted
dB Gain, Right Muted
D1
D1
D0
D0
Default
Default