AD1980 Analog Devices, AD1980 Datasheet - Page 15

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

*For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
RIM[3:0]
RM
LIM[3:0]
IM
Reg. 76h
MSPLT* D15 WRITE READBACK
0
0
0
1
1
1
*For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right
REV. 0
Reg
No. Name
1Ch Record Gain
If MSPLT is not set, Bit D7 has no effect. All registers not shown, and bits containing an X are assumed to be reserved. Refer to Table VI for examples.
channels. If MSPLT is not set, Bit D7 has no effect.
x is “don’t care.”
0
0
1
0
1
1
Left Input Mixer Gain Control. Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
Right Input Mixer Gain Control. Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, 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.”
Input Mute. When this bit is set to “1,” both the left and the right channels are muted, unless the MSPLT bit in
Register 76h is set to “1,” in which case this mute bit will affect only the left channel.
LS [10:8]
000
001
010
011
100
101
110
111
1111
0000
xxxx
1111
xxxx
xxxx
D15
IM
Left Channel Input Mixer D[11:8]
D14
X
1111
0000
xxxx
1111
xxxx
xxxx
D13
X
D12
X
Left Record Source
MIC
CD_L
Muted
AUX_L
LINE_IN_L
Stereo Mix (L)
Mono Mix
PHONE_IN
D11
LIM3
Table VI. Settings for Record Gain Register
Table V. Settings for Record Select Control
Function
22.5 dB Gain
0 dB Gain
– dB Gain, Muted
22.5 dB Gain
– dB Gain,
Left Only Muted
– dB Gain,
Left Muted
Record Gain Register (Index 1Ch)
D10
LIM2
Record Gain (1Ch)
D9
LIM1 LIM0 IMRM* X
Control Bits
–15–
D8
RS [2:0]
000
001
010
011
100
101
110
111
D7*
x
x
1
0
1
x
D7
WRITE READBACK Function
1111
0000
xxxx
xxxx
1111
xxxx
D6
Right Channel Input Mixer D[3:0]
X
D5
1111
0000
xxxx
xxxx
1111
xxxx
Right Record Source
MIC
CD_R
Muted
AUX_R
LINE_IN_R
Stereo Mix (R)
Mono Mix
PHONE_IN
D4 D3
X
RIM3
D2
RIM2 RIM1 RIM0 8000h
22.5 dB Gain
0 dB Gain
– dB Gain, Muted
– dB Gain,
Right Only Muted
22.5 dB Gain
– dB Gain, Right Muted
D1
AD1980
D0
Default