AD1985 データシートの表示（PDF） - Analog Devices
部品番号
コンポーネント説明
一致するリスト
AD1985 Datasheet PDF : 48 Pages
| |||
AD1985
Phone_In Volume Register (Index 0x0C)
Reg Num Name
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0x0C
Phone_In Volume
PHM X X X X X X X X X X PHV4 PHV3 PHV2 PHV1 PHV0 0x8008
PHV[4:0]
PHM
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.
Volume Settings for Phone and MIC
Control Bits D[4:0]
Phone (0x0C) and MIC (0x0E)
D15 Write
Readback
Function
0 0 0000
0 0000
12 dB Gain
0 0 1000
0 1000
0 dB Gain
0 1 1111
1 1111
–34.5 dB Gain
1 x xxxx
x xxxx
–∞ dB Gain, Muted
Note that the x in the above table is a wild card, meaning the value has no effect.
Microphone Volume Register (Index 0x0E)
Reg Num Name
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0x0E
MIC Volume MCM X X X X X X X X M20 X MCV4 MCV3 MCV2 MCV1 MCV0 0x8008
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
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.
0 = Disabled; Gain = 0 dB.
1 = Enabled; Default Gain = +20 dB (see Register 0x76, Bits D0 and D1).
MIC Mute. When this bit is set to 1, both channels are muted.
Rev. A | Page 19 of 48
Share Link: 