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STAC9704 데이터시트(PDF) 29 Page - Hynix Semiconductor

부품명 STAC9704
상세설명  Multimedia Audio Codec for AC97
PDF  49 Pages
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제조업체  HYNIX [Hynix Semiconductor]
홈페이지  http://www.skhynix.com/kor/main.do
Logo HYNIX - Hynix Semiconductor

STAC9704 데이터시트(HTML) 29 Page - Hynix Semiconductor

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SigmaTel, Inc.
STAC9704/7
29
10/02/98
4.4.6 Record Gain Registers (Index 1Ch)
The 1Ch register adjusts stereo input record gain.
Each step corresponds to 1.5 dB.
22.5 dB
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 0 dB gain with mute on.
Table 14: Record Gain Registers
MUTE
GX3… GX0
FUNCTION
0
1111
+22.5 dB gain
0
0000
0 dB gain
1
xxxx
-
∞ gain
4.4.7
General Purpose Register (Index 20h)
This register is used to control some miscellaneous functions. Below is a summary of each bit and its
function. The MS bit controls the mic selector. The LPBK bit enables loopback of the ADC output to
the DAC input, without involving the AC-link, allowing for full system performance measurements.
Table 15: General Purpose Register
BIT
FUNCTION
3D
3D Stereo Enhancement on/off 1 = on
MIX
Mono output select 0 = Mix, 1= Mic
MS
Mic select 0 = Mic1, 1 = Mic2
LPBK
ADC/DAC loopback mode



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