AD1985 Analog Devices, AD1985 Datasheet - Page 23

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

Record Gain (Index 0x1C)
Reg Num
0x1C
*For AC ’97 compatibility, Bit D7 (IMRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right
channels.
RIV[3:0]
IMRM
LIV[3:0]
IM
IM
0
0
1
xIM3–xIM0
1111
0000
xxxxx
Name
Record Gain
Function
+22.5 dB Gain
0 dB Gain
Muted
Right Input Mixer Gain Control. Each LSB represents 1.5 dB and the gain range is 0 dB to +22.5 dB.
Right Channel Mute. Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel separately
from the IM bit. Otherwise this bit will always read 0 and will have no effect when set to 1.
Left Input Mixer Gain Control. Each LSB represents 1.5 dB and the gain range is 0 dB to +22.5 dB.
Input Mute. When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in Register
0x76 is set to 1, in which case this mute bit will only affect the left channel.
D15 D14 D13 D12 D11
IM
X
X
X
LIV3
D10
LIV2
Rev. 0 | Page 23 of 48
D9
LIV1
D8
LIV0
D7
IMRM*
D6 D5 D4 D3
X
X
X
RIV3
D2
RIV2
D1
RIV1
D0
RIV0
AD1985
Default
0x8000