AD1846 Analog Devices, AD1846 Datasheet - Page 15

• Manufacturer Part Number: AD1846
• Description: Low Cost Parallel-port 16-bit Soundport Stereo Codec
• Manufacturer: Analog Devices

REV. A
RIG3:0
res
RMGE
RSS1:0
This register’s initial state after reset is “000x 0000.”
LX1A4:0 Left Auxiliary Input #1 Attenuate Select. The least significant bit of this gain/attenuate select represents –1.5 dB.
res
LMX1
This register’s initial state after reset is “1xx0 0000.”
RX1A4:0 Right Auxiliary Input #1 Attenuate Select. The least significant bit of this gain/attenuate select represents –1.5 dB.
res
RMX1
This register’s initial state after reset is “1xx0 0000.”
Right Input Control (IXA3:0 = 1)
Left Auxiliary #1 Input Control (IXA3:0 = 2)
Right Auxiliary #1 Input Control (IXA3:0 = 3)
IXA3:0
IXA3:0
IXA3:0
1
2
3
Right Input Gain Select. The 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. These bits select the input source for the right channel gain stage preceding the right ADC.
0
1
2
3
LX1A4:0 = 0 produces a +12 dB gain. LX1A4:0 = “01000” (8 decimal) produces 0 dB gain. Maximum attenuation is
–34.5 dB.
Reserved for future expansion. Always write zeros to these bits.
Left Auxiliary #1 Mute. This bit, when set, will mute the left channel of the Auxiliary #1 input source. This bit is set to
“1” after reset.
RX1A4:0 = 0 produces a +12 dB gain. RX1A4:0 = “01000” (8 decimal) produces 0 dB gain. Maximum attenuation is
–34.5 dB.
Reserved for future expansion. Always write zeros to these bits.
Right Auxiliary #1 Mute. This bit, when set, will mute the right channel of the Auxiliary #1 input source. This bit is set to
“1” after reset.
Right Line Source Selected
Right Auxiliary 1 Source Selected
Right Microphone Source Selected
Right Post-Mixed DAC Output Source Selected
Data 7
Data 7
Data 7
LMX1
RMX1
RSS1
Data 6
Data 6
Data 6
RSS0
res
res
Data 5
RMGE
Data 5
Data 5
res
res
LX1A4
RX1A4
Data 4
Data 4
Data 4
–15–
res
LX1A3
RX1A3
Data 3
Data 3
Data 3
RIG3
LX1A2
RX1A2
Data 2
Data 2
Data 2
RIG2
LX1A1
RX1A1
Data 1
Data 1
Data 1
RIG1
AD1846
LX1A0
RX1A0
Data 0
Data 0
Data 0
RIG0