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STAC9704 bảng dữ liệu(PDF) 27 Page - Hynix Semiconductor

tên linh kiện STAC9704
Giải thích chi tiết về linh kiện  Multimedia Audio Codec for AC97
PDF  49 Pages
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nhà sản xuất  HYNIX [Hynix Semiconductor]
Trang chủ  http://www.skhynix.com/kor/main.do
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STAC9704 bảng dữ liệu(HTML) 27 Page - Hynix Semiconductor

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SigmaTel, Inc.
STAC9704/7
27
10/02/98
Table 11: PC_BEEP Register
MUTE
PV3…PV0
FUNCTION
0
0000
0 dB Attenuation
0
1111
45 dB Attenuation
1
xxxx
∞ dB Attenuation
4.4.4 Analog Mixer Input Gain Registers (Index 0Ch - 18h)
These registers control the gain/attenuation for each of the analog inputs. Each step corresponds to
approximately 1.5 dB. 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) has an extra bit that is for a 20dB
boost. When bit 6 is set to 1, the 20 dB boost is on. The default value is 8008, which corresponds to 0
dB 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 0 dB gain with
mute on.
Table 12: Analog Mixer Input Gain Register
MUTE
Gx4…Gx0
FUNCTION
0
00000
+12 dB gain
0
01000
0 dB gain
0
11111
-34.5 dB gain
1
xxxxx
-
∞ dB gain
4.4.5 Record Select Control Register (Index 1Ah)
Used to select the record source independently for right and left. The default value is 0000h, which
corresponds to Mic in.



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