AD1981B データシートの表示（PDF） - Analog Devices
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AD1981B Datasheet PDF : 28 Pages
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AD1981B
Table IV. Volume Settings for Line-In, CD Volume, AUX, and PCM-Out
Reg. 76h
Control Bits
Line-In (10h), CD (12h), AUX (16h), and PCM-Out (18h)
Left Channel Volume D[12:8]
Right Channel Volume D[4:0]
MSPLT* D15 WRITE READBACK Function
D7* WRITE READBACK Function
0
0 0 0000 0 0000
12 dB Gain
x 0 0000 0 0000
+12 dB Gain
0
0 0 1000 0 1000
0 dB Gain
x 0 1000 0 1000
0 dB Gain
0
0 1 1111 1 1111
34.5 dB Gain
x 1 1111 1 1111
–34.5 dB Gain
0
1 x xxxx x xxxx
–ϱ dB Gain, Muted
x x xxxx x xxxx
–ϱ dB Gain, Muted
1
0 1 1111 1 1111
–34.5 dB Gain
1 x xxxx x xxxx
–ϱ dB Gain,
Right Only Muted
1
1 x xxxx x xxxx
–ϱ dB Gain,
0 1 1111 1 1111
–34.5 dB Gain
Left Only Muted
1
1 x xxxx x xxxx
–ϱ dB Gain, Left Muted 1 x xxxx x xxxx
–ϱ dB Gain, Right Muted
*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
channels. If MSPLT is not set, RM bit has no effect.
x in the above table is a wild card and has no effect on the value.
Record Select Control Register (Index 1Ah)
Reg
No. Name
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
1Ah Record Select X X
X
X
X LS2 LS1 LS0 X X X X X RS2 RS1 RS0 0000h
All registers not shown and bits containing an X are assumed to be reserved. Used to select the record source independently for right and left. The default value is
0000h, which corresponds to MIC In. Refer to Table V for examples.
RS[2:0]
LS[2:0]
Right Record Select
Left Record Select
Table V. Settings for Record Select Control
LS [10:8]
000
001
010
011
100
101
110
111
Left Record Source
MIC
CD_L
Muted
AUX_L
LINE_IN_L
Stereo Mix (L)
Mono Mix
PHONE_IN
RS [2:0]
000
001
010
011
100
101
110
111
Right Record Source
MIC
CD_R
Muted
AUX_R
LINE_IN_R
Stereo Mix (R)
Mono Mix
PHONE_IN
REV. B
–15–
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