AD1986 Analog Devices, AD1986 Datasheet - Page 31

• Manufacturer Part Number: AD1986
• Manufacturer: Analog Devices

Preliminary Technical Data
C/LFE DAC VOLUME (REGISTER 0x36)
This register controls the CENTER/LFE DAC gain and mute to the output selector section. The volume register contains five bits,
generating 32 volume steps of −1.5 dB each for a range of +12.0 dB to −34.5 dB.
Note that the left/right association of the CENTER and LFE channels can be swapped at the CODEC outputs by setting the CSWP bit in
Register 74h. These controls remain unchanged regardless of the state of CSWP.
Reg
0x36
Table 53.
Register
CNT [4:0]
(Center Volume)
CNTM
(Center Mute)
LFE [4:0]
(LFE Volume)
LFEM
(LFE Mute)
x
SURROUND DAC VOLUME (REGISTER 0x38)
This register controls the SURROUND DAC gain and mute to the output selector section. The volume register contains five bits,
generating 32 volume steps of −1.5 dB each for a range of +12.0 dB to −34.5 dB.
Reg
0x18
Table 54.
Register
L/RV [4:0]
(Left/Right
Volume)
L/RM
(Left/Right
Mute)
x
Name
C/LFE
DAC
Volume
Name
Surround
DAC
Volume
D15
LFEM
Function
Controls the left/right channel gains of this input to the output selector section from +12 dB to -34.5 dB. The least
significant bit represents −1.5 dB.
L/RM
0
0
0
1
Mutes the left/right channels independently.
Reserved.
Function
Controls the gain of the CENTER channel to the output selector section from +12.0 dB to −34.5 dB. The least significant
bit represents −1.5 dB.
CNTM
0
0
0
1
Mutes the center channel.
Controls the gain of the LFE channel to the output selector section from +12.0 dB to −34.5 dB. The least significant bit
represents −1.5 dB.
LFEM
0
0
0
1
Mutes the LFE channel.
Reserved.
D15
LM
D14
x
D14
x
D13
x
L/RV [4:0]
x xxxx
0 0000
0 1000
1 1111
D13
x
D12
LFE4
CNT [4:0]
0 0000
0 1000
1 1111
x xxxx
LFE[4:0]
0 0000
0 1000
1 1111
x xxxx
D12
LV4
D11
LFE3
D11
LV3
D10
LFE2
D10
LV2
D9
LFE1
Rev. 0 | Page 31 of 52
Function
+12 dB gain
0 dB
−34.5 dB attenuation
Muted
Function
+12 dB gain
0 dB attenuation
−34.5 dB attenuation
Muted
Function
+12 dB gain
0 dB attenuation
−34.5 dB attenuation
Muted
D9
LV1
D8
LFE0
LV0
D8
D7
CNTM
D7
RM
D6
x
D6
x
D5
x
D5
x
D4
CNT4
RV4
D4
D3
CNT3
D3
RV3
D2
CNT2
D2
RV2
Default
Default
Default: muted (0x1)
Default
Default: muted (0x1)
Default: 0
D1
CNT1
Default
Default
Default: 0
Default: muted (0x1)
RV1
D1
D0
CNT0
D0
RV0
AD1986
Default
0x8888
Default
0x8888