AD1980 Analog Devices, AD1980 Datasheet - Page 12

• Manufacturer Part Number: AD1980
• Description: AD1980 AC'97 SoundMAX® Codec W/spdif W/eq
• Manufacturer: Analog Devices

AD1980
All registers not shown and bits containing an X are assumed to be reserved. Refer to Table III for examples.
PHV[4:0]
PHM
All registers not shown, and bits containing an X are assumed to be reserved. Refer to Table III for examples.
MCV[4:0]
M20
MCM
Reg
No. Name
0Ch Phone_in Volume PHM X
Reg
No. Name
0Eh MIC Volume
Phone Volume. Allows setting the Phone Volume attenuator in 32 volume levels with 31 steps of 1.5 dB each. The
LSB represents 1.5 dB, and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, with the mute bit enabled.
Phone Mute. When this bit is set to “1,” the Phone channel is muted.
MIC Volume Gain. Allows setting the MIC Volume 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, with mute enabled.
MIC Gain Boost. This bit allows setting additional MIC gain to increase the microphone sensitivity. The nominal
gain boost by default is 20 dB, however, Bits D0 and D1 (MBG[1:0]) on the miscellaneous control bits register
(76h) allow changing the gain boost to 10 dB or 30 dB, if necessary.
0 = Disabled; Gain = 0 dB
1 = Enabled; Default Gain = 20 dB (see Register 76h, Bits D0, D1)
MIC Mute. When this bit is set to “1,” the channel is muted.
D15
MCM X
D15
D14 D13
D14 D13
D15
0
0
0
1
x in the above table is a wild card, and has no effect on the value.
X
X
D12
X
D12
X
WRITE
0 0000
0 1000
1 1111
x xxxx
Table III. Volume Settings for Phone and MIC
Phone (0Ch) and MIC (0Eh)
D11
X
D11
X
Phone_in Volume Register (Index 0Ch)
Control Bits D[4:0]
MIC Volume Register (Index 0Eh)
D10
X
D10
X
D9
X
D9
X
READBACK
0 0000
0 1000
1 1111
x xxxx
–12–
D8
X
D8
X
D7
X
D7
X
D6
M20
D6
X
X
D5
D5
X
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
– dB Gain, Muted
D4
MCV4
D4
PHV4 PHV3 PHV2 PHV1 PHV0 8008h
D3
MCV3 MCV2
D3
D2
D2
D1
MCV1 MCV0 8008h
D1
D0
D0
REV. 0
Default
Default