AD1881A
General Purpose Register (Index 20h)
Reg
Name
D15
D14
X
D13
3D
D12
X
D11
X
D10
X
D9
D8
D7
D6
X
D5
X
D4
X
D3
X
D2
X
D1
X
D0
X
Default
0000h
Num
20h
General Purpose
POP
MIX MS
LPBK
Note: This register should be read before writing to generate a mask for only the bit(s) that need to be changed. The function
default value is 0000h which is all off.
LPBK
MS
Loopback Control. ADC/DAC Digital Loopback Mode
MIC Select
0 = MIC1.
1 = MIC2.
MIX
3D
Mono Output Select
0 = Mix.
1 = MIC.
3D PHAT Stereo Enhancement
0 = PHAT Stereo is off.
1 = PHAT Stereo is on.
POP
PCM Output Path and Mute. The POP bit controls the optional PCM out 3D bypass path (the pre- and post-3D
PCM out paths are mutually exclusive).
0 = pre-3D.
1 = post-3D.
3D Control Register (Index 22h)
Reg
Name
D15 D14 D13 D12 D11 D10 D9
D8
X
D7
X
D6
X
D5
X
D4
X
D3
D2
D1
D0
Default
Num
22h
3D Control
X
X
X
X
X
X
X
DP3 DP2 DP1 DP0 0000h
DP[2:0]
Depth Control. Sets 3D “Depth” PHAT Stereo enhancement according to table below.
DP3 . . . DP0
Depth
0000
0001
.
0%
6.67%
.
.
.
1110
1111
93.33%
100%
REV. 0
–16–
ADI [ ADI ]
