
AD1846
REV. A
–15–
R ight Input Control (IX A3:0 = 1)
IX A3:0
Data 7
1
Data 6
RSS0
Data 5
RMGE
Data 4
res
Data 3
RIG3
Data 2
RIG2
Data 1
RIG1
Data 0
RIG0
RSS1
RIG3:0
res
RMGE
RSS1:0
Right Input Gain Select. T he least significant bit of this gain select represents +1.5 dB. Maximum gain is +22.5 dB.
Reserved for future expansion. Always write a zero to this bit.
Right Input Microphone Gain Enable. Setting this bit will enable the +18 dB digital gain of the right mic input signal.
Right Input Source Select. T hese bits select the input source for the right channel gain stage preceding the right ADC.
0
Right Line Source Selected
1
Right Auxiliary 1 Source Selected
2
Right Microphone Source Selected
3
Right Post-Mixed DAC Output Source Selected
T his register’s initial state after reset is “000x 0000.”
Left Auxiliary #1 Input Control (IX A3:0 = 2)
IX A3:0
Data 7
2
L MX 1
Data 6
res
Data 5
res
Data 4
L X 1A4
Data 3
L X 1A3
Data 2
L X 1A2
Data 1
L X 1A1
Data 0
L X 1A0
LX 1A4:0 Left Auxiliary Input #1 Attenuate Select. T he least significant bit of this gain/attenuate select represents –1.5 dB.
LX 1A4:0 = 0 produces a +12 dB gain. LX 1A4:0 = “01000” (8 decimal) produces 0 dB gain. Maximum attenuation is
–34.5 dB.
res
Reserved for future expansion. Always write zeros to these bits.
LMX 1
Left Auxiliary #1 Mute. T his bit, when set, will mute the left channel of the Auxiliary #1 input source. T his bit is set to
“1” after reset.
T his register’s initial state after reset is “1xx0 0000.”
R ight Auxiliary #1 Input Control (IX A3:0 = 3)
IX A3:0
Data 7
3
RMX 1
Data 6
res
Data 5
res
Data 4
RX 1A4
Data 3
RX 1A3
Data 2
RX 1A2
Data 1
RX 1A1
Data 0
RX 1A0
RX 1A4:0 Right Auxiliary Input #1 Attenuate Select. T he least significant bit of this gain/attenuate select represents –1.5 dB.
RX 1A4:0 = 0 produces a +12 dB gain. RX 1A4:0 = “01000” (8 decimal) produces 0 dB gain. Maximum attenuation is
–34.5 dB.
res
Reserved for future expansion. Always write zeros to these bits.
RMX 1
Right Auxiliary #1 Mute. T his bit, when set, will mute the right channel of the Auxiliary #1 input source. T his bit is set to
“1” after reset.
T his register’s initial state after reset is “1xx0 0000.”