WM9701 데이터 시트보기 (PDF) - Wolfson Microelectronics plc
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WM9701 Datasheet PDF : 24 Pages
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Production Data
WM9701A
MUTE
0
0
1
0000
1111
xxxx
PV3...PV0
Table 3 PC-beep Register Function
FUNCTION
0dB attenuation
45dB attenuation
∞dB attenuation
ANALOGUE MIXER INPUT GAIN REGISTERS (INDEX 0CH - 18h)
This controls the gain/attenuation for each of the analogue inputs. Each step corresponds to
approximately 1.5dB. The MSB of the register is the mute bit. When this bit is set to 1 the level for
that channel is set at -∞dB.
REGISTER 0EH (MIC VOLUME REGISTER)
This has an extra bit that is for a 20dB boost. When bit 6 is set to 1 the 20dB boost is on. The default
value is 8008, which corresponds to 0dB gain with mute on.
The default value for the mono registers is 8008h, which corresponds to 0dB gain with mute on. The
default value for stereo registers is 8808h, which corresponds to 0dB gain with mute on.
MUTE
0
0
0
1
GX4...GX0
00000
01000
11111
xxxxx
+12dB gain
0dB gain
-34.5dB gain
-∞dB gain
FUNCTION
Table 4 Mixer Gain Control Register Function
RECORD SELECT CONTROL REGISTER (INDEX 1Ah)
Used to select the record source independently for right and left. (see Table 5 for legend). The
default value is 0000h, which corresponds to Mic in.
SR2 -SR0
0
1
2
3
4
5
6
7
RIGHT
RECORD
SOURCE
Mic
CD in (R)
Video in (R)
Aux in (R)
Line in (R)
Stereo mix (R)
Mono mix
Phone
Table 5 Record Select Register Function
SL2-SL0
0
1
2
3
4
5
6
7
LEFT RECORD SOURCE
Mic
CD in (L)
Video in (L)
Aux in (L)
Line in (L)
Stereo mix (L)
Mono mix
Phone
RECORD GAIN REGISTERS (INDEX 1Ch AND 1Eh)
1Ch is for the stereo input and 1Eh is for the optional special purpose correlated audio Mic channel.
Each step corresponds to 1.5dB. 22.5dB corresponds to 0F0Fh and 000Fh respectively. The MSB of
the register is the mute bit. When this bit is set to 1 the level for that channel(s) is set at -∞dB.
The default value is 8000h, which corresponds to 0dB gain with mute on.
MUTE
0
0
1
GX3...GX0
1111
0000
xxxxx
Table 6 Record Gain Register Function
FUNCTION
+22.5dB gain
0dB gain
-∞dB gain
WOLFSON MICROELECTRONICS LTD.
PD Rev 3.2 January 2001
17
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