STAC9460 Datasheet, PDF (15/21 Pages) List of Unclassifed Manufacturers – Two and Six-Channel, 24-Bit, 192 kHz Audio Codec

PRELIMINARY INFORMATION 8/24/01
STAC9460/62
Two and Six-Channel, 24-Bit, 192 kHz Audio Codec
7.1.4.
LF/RF, LR/RR, Center/LFE Output Channel Volume Registers(03h-08h)
These registers determines the output signal volumes ranging from 0 dB to –96 dB
with 0.75 dB steps. The MSB of the register is the mute bit for the channel. When
this bit is set to 1, the outputlevel for that channel is -∞ dB. Please note the
STAC9462 only uses registers 3 and 4 for the Left and Right Front Channels.
D7
D6…D0
FUNCTION
0
000 0000
0 dB Attenuation
0
111 1111
96 dB Attenuation
1
XXX XXXX
∞ dB Attenuation
Table 8. DAC Digital Volume Registers
7.1.5.
Microphone Input Volume Registers (09h-0Ah)
These registers control the gain/attenuation for each of the microphone inputs rang-
ing from 0 dB to 10.5 dB, with each step corresponding to approximately 1.5dB.
MSB
0
0
1
ML3…ML0
0000
1111
XXXX
FUNCTION
0 dB
22.5 dB
∞ dB Attenuation
MSB
0
0
1
MR3…MR0
0000
1111
XXXX
FUNCTION
0 dB
22.5 dB
∞ dB Attenuation
Table 9. Left and Right Mic Input Volume Registers
7.1.6.
De-Emphasis Register (0Ch)
This register is used to turn de-emphasis on and off for each channel. De-emphasis
control bits D5..D0 (DEMLFE .. DEMLF) select whether or not de-emphasis is
turned on or off for the given DAC and bits D7-D6 (DEM1 and DEM0) determine
which response curve to use.
BIT
FUNCTION
D7
De-emphasis OFF
D6
De-emphasis ON
D5
De-emphasis select for the LFE
D4
De-emphasis select for the CENTER
D3
De-emphasis select fot the RIGHT REAR
D2
De-emphasis select for the LEFT REAR
D1
De-emphasis select for the RIGHT FRONT
D0
De-emphasis select for the LEFT FRONT
Table 10. On/Off De-emphasis Selection for Each Channel
D7 .. D6
00
01
10
11
32 kHz Response Curve
44.1 kHz Response Curve
48 kHz Response Curve
96 kHz Response Curve
FUNCTION
Table 11. De-emphasis Filter Selection
2-9460-D1-1-0-0801
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