ad1985jstz-reel Analog Devices, Inc., ad1985jstz-reel Datasheet - Page 19

• Manufacturer Part Number: ad1985jstz-reel
• Description: Ac ?97 Soundmax Codec
• Manufacturer: Analog Devices, Inc.

Reg Num
0x0C
Reg Num
0x0E
Phone_In Volume Register (Index 0x0C)
PHV[4:0]
PHM
Volume Settings for Phone and MIC
D15
0
0
0
1
Note that the x in the above table is a wild card, meaning the value has no effect.
Microphone Volume Register (Index 0x0E)
This register controls the volume, gain boost, and mute for the gain/attenuators on both the MIC1 and MIC2 paths to the mixer. There is
no separate control for left and right on this path. The signal paths must be identical, hence the single control for both.
MCV[4:0]
M20
MCM
Phone (0x0C) and MIC (0x0E)
Write
0 0000
0 1000
1 1111
x xxxx
Name
Name
MIC Volume
Phone_In Volume
Control Bits D[4:0]
Readback
0 0000
0 1000
1 1111
x xxxx
MIC Volume. Allows setting the MIC volume 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, with mute enabled.
MIC Gain Boost. This bit allows setting additional MIC gain to increase the microphone sensitivity. Gain is applied
to the microphone path to both the analog mixer and the ADC(s).
The nominal gain boost by default is +20 dB; however, Bits D0 and D1 (MBG[1:0]) on the Miscellaneous Control Bits
Register (0x76), allow changing the gain boost to +10 dB or +30 dB, if necessary.
MIC Mute. When this bit is set to 1, both channels are muted.
Phone Volume. Allows setting the phone volume 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, with mute bit enabled.
Phone Mute. When this bit is set to 1, the Phone channel is muted.
D15
MCM X
0 = Disabled; Gain = 0 dB.
1 = Enabled; Default Gain = +20 dB (see Register 0x76, Bits D0 and D1).
D14 D13 D12 D11 D10 D9 D8 D7 D6
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4
PHM X
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
–∞ dB Gain, Muted
X
X
X
X
X
X
X
Rev. A | Page 19 of 48
X
X
X
X
X
X
M20 X
X
D5 D4
X
MCV4 MCV3 MCV2 MCV1 MCV0
X
PHV4 PHV3 PHV2 PHV1 PHV0 0x8008
D3
D3
D2
D2
D1
D1
D0
D0
AD1985
Default
0x8008
Default