alc203-lf Realtek Semiconductor Corporation, alc203-lf Datasheet - Page 14

• Manufacturer Part Number: alc203-lf
• Description: Two-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

6.1.7 MX0E MIC Volume
Default: 8008h
Register 0Eh controls the microphone input volume. Each step in bits 4:0 corresponds to a 1.5dB increase/decrease in volume,
allowing 32 levels of volume, from 00000 to 11111. Bit 6 enables/disables a boost in volume to a magnification based on bits 9:8.
6.1.8 MX10 LINE_IN Volume
Default: 8808h
Register 10h controls the LINE_IN input volume. Each step in bits 4:0 corresponds to a 1.5dB increase/decrease in volume for
the right channel, allowing 32 levels of volume, from 00000 to 11111. Each step in bits 12:8 corresponds to a 1.5dB
increase/decrease in volume for the left channel, allowing 32 levels of volume, from 00000 to 11111.
6.1.9 MX12 CD Volume
Default: 8808h
Register 12h controls the CD input volume. Each step in bits 4:0 corresponds to a 1.5dB increase/decrease in volume for the right
channel, allowing 32 levels of volume, from 00000 to 11111. Each step in bits 12:8 corresponds to a 1.5dB increase/decrease in
volume for the left channel, allowing 32 levels of volume, from 00000 to 11111.
Two-Channel AC’97 2.3 Audio Codec
14:10
14:13
14:13
12:8
12:8
Bit
9:8
4:0
Bit
7:5
4:0
Bit
7:5
4:0
15
15
15
7
6
5
For MV:
For NLV/NRV:
For CLV/CRV:
If 29.5dB boost gain is selected, input resistor can be reduced to save area of feedback resistor.
Type
Type
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Mute Control 0: Normal
Reserved
Boost Gain Option (BGO)
Reserved
Boost Control (BC)
Reserved
Mic Volume (MV[4:0]) in 1.5 dB steps
Mute Control 0: Normal
Reserved
Line-In Left Volume (NLV[4:0]) in 1.5 dB steps
Reserved
Line-In Right Volume (NRV[4:0]) in 1.5 dB steps
Mute Control 0: Normal
Reserved
CD Left Volume (CLV[4:0]) in 1.5 dB steps
Reserved
CD Right Volume (CRV[4:0]) in 1.5 dB steps
00: 20 dB
0: Disable 1: Enable Boost
08h
1Fh
00h
01: 6 dB
08h
1Fh
08h
1Fh
+12 dB Gain
0dB gain
-34.5dB Gain
00h
00h
+12 dB Gain
0dB gain
-34.5dB Gain
+12 dB Gain
0dB gain
-34.5dB Gain
10: 12 dB
1: Mute (-∞ dB)
1: Mute (-∞ dB)
1: Mute (-∞ dB)
11: 29.5 dB (V=30*Vmic-in)
10
Function
Function
Function
ALC203 DataSheet
Rev1.6