AD1980 Просмотр технического описания (PDF) - Analog Devices
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AD1980 Datasheet PDF : 32 Pages
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LS [10:8]
000
001
010
011
100
101
110
111
AD1980
Table V. Settings for Record Select Control
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
Record Gain Register (Index 1Ch)
Reg
No. Name
D15 D14 D13 D12 D11 D10 D9 D8 D7
D6 D5 D4 D3
D2 D1 D0 Default
1Ch Record Gain IM X X X LIM3 LIM2 LIM1 LIM0 IMRM* X X X RIM3 RIM2 RIM1 RIM0 8000h
*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.
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.
RIM[3:0]
RM
LIM[3:0]
IM
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.”
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.
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.
Table VI. Settings for Record Gain Register
Reg. 76h
Control Bits
Record Gain (1Ch)
Left Channel Input Mixer D[11:8]
Right Channel Input Mixer D[3:0]
MSPLT* D15 WRITE READBACK Function
D7* WRITE READBACK Function
0
0 1111 1111
22.5 dB Gain
x 1111 1111
22.5 dB Gain
0
0 0000 0000
0 dB Gain
x 0000 0000
0 dB Gain
0
1 xxxx xxxx
–ϱ dB Gain, Muted x
xxxx
xxxx
–ϱ dB Gain, Muted
1
0 1111 1111
22.5 dB Gain
1 xxxx xxxx
–ϱ dB Gain,
Right Only Muted
1
1 xxxx xxxx
–ϱ dB Gain,
Left Only Muted
0 1111 1111
22.5 dB Gain
1
1 xxxx xxxx
–ϱ dB Gain,
Left Muted
1 xxxx 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, Bit D7 has no effect.
x is “don’t care.”
REV. 0
–15–
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