AD1986A Analog Devices, AD1986A Datasheet - Page 24

• Manufacturer Part Number: AD1986A
• Description: HD Audio SoundMAX Codec
• Manufacturer: Analog Devices

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AD1986A
Table 78.
Register
V [4:0]
(Volume)
M (Mute)
x
MICROPHONE VOLUME (REGISTER 0x0E)
This register controls the MIC_1 (left) and MIC_2 (right) channels’ gain, boost, and mute to the analog mixer section. The volume register
contains five bits, generating 32 volume steps of −1.5 dB each for a range of +12.0 dB to −34.5 dB. This does not control the record ADC
gain (see Register 0x1C).
In typical stereo microphone applications, the signal paths must be identical and should be set to the same gain, boost, and mute values.
With stereo controls, this input is capable of using nonmicrophone sources by disabling the microphone boost (M20 bit = 0).
Reg
0x0E
Table 79.
Register
L/RV [4:0]
(Left/Right
Volume)
M20
(MIC_1/2
Gain
Boost)
L/RM
(Left/Right
Mute)
x
4
Name
Microphone
Volume
Function
Controls the left/right channel gains of this input to the analog mixer from +12 dB to −34.5 dB. The least significant bit
represents −1.5 dB.
L/RM
0
0
0
1
Enables additional gain to increase the microphone sensitivity. This controls the boost of both the MIC_1 and MIC_2 channels.
The nominal gain boost by default is 20 dB; however, MBG0 [1:0] bits (Register 0x76), allow changing the gain boost to 10 dB
or 30 dB if necessary.
M20
0
1
1
1
Mutes the left/right channels independently.
Reserved.
Function
Controls the gain of this input to the analog mixer from +12.0 dB to −34.5 dB. The least significant bit represents −1.5
dB.
MV
0
0
0
1
Mutes the input to the analog mixer.
Reserved.
D15
LM
D14
x
L/RV [4:0]
0 0000
0 1000
1 1111
x xxxx
MGB0 [1:0]
xx
00
01
x xxxx
0 0000
0 1000
1 1111
x xxxx
[4:0]
D13
x
D12
LV4
D11
LV3
Function
12 dB gain
0 dB
−34.5 dB attenuation
Muted
D10
LV2
Function
12 dB gain
0 dB
−34.5 dB attenuation
Mute
Boost Gain
0 dB gain
20 dB gain
10 dB gain
Mute
Rev. 0 | Page 24 of 56
D9
LV1
D8
LV0
D7
RM
D6
M20
D5
x
D4
RV4
Default
Default
Default
Default: disabled
Default
Default: muted (0x1)
Default: 0
D3
RV3
RV2
D2
Default
Default
Default: 0
Default: muted (0x1)
D1
RV1
D0
RV0
0x8888
Default