AD1985 Analog Devices, AD1985 Datasheet - Page 17

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

Mono Volume (Index 0x06)
Reg Num
0x06
This register controls the Mono output volume and mute bit.
The volume register contains five bits, generating 32 volume
levels with increments of 1.5 dB each. Because AC ’97 defines
6-bit volume registers, to maintain compatibility, whenever the
MV[5:0]
MVM
Volume Settings for Mono
D15
0
0
0
1
Note: x in the above table is a wild card, meaning the value has no effect.
Control Bits D[4:0] for Mono (0x06)
WRITE
0 0000
0 1111
1 1111
x xxxx
Name
Mono Volume
READBACK
0 0000
0 1111
1 1111
x xxxx
Mono Volume Mute. When this bit is set to 1, the channel is muted.
Mono Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a
maximum attenuation of 46.5 dB.
D15
MVM
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4
X
Function
0 dB Gain
–22.5 dB Gain
–46.5 dB Gain
–∞
X
dB Gain, Muted
X
X
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X
X
D5 bit is set to 1, its respective lower five volume bits are
automatically set to 1 by the codec logic. On readback, all lower
five bits will read 1s whenever this bit is set to 1.
X
X
X
X
MV4 MV3 MV2 MV1 MV0 0x8000
D3
D2
D1
D0
AD1985
Default