STA309B View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA309B' PDF : 66 Pages View PDF
Registers
STA309B
7.2.34
Bitfield
1
0
FSS - front speaker size
SUB - subwoofer
Large
On
Small
Off
When AMBMXE = 1, biquad #7 on channels 1-6 are utilized for the bass-management
crossover filter, this biquad is not user-programmable in this mode. The XO settings
determine the crossover frequency used, the crossover is 2nd order for both high-pass and
low-pass with a -3 dB cross point. Higher order filters can be obtained be programming
coefficients in other biquads if desired.
It is recommended to use settings of 120-160 Hz when using small, single driver satellite
speakers as the frequency response of these speakers normally is limited to this region.
AUTO3 - AutoMode AM/pre-scale/bass management scale (0x21)
D7
D6
D5
D4
D3
AMAM2 AMAM1 AMAM0 AMAME
0
0
0
0
D2
D1
D0
MSA
AMPS
0
0
Bit RW RST
Name
0 RW 0
AMPS
Description
AutoMode pre-scale
0: -18 dB used for pre-scale when AMEQ = 00
1: user-defined pre-scale when AMEQ = 00
Bit RW RST
Name
1 RW 0
MSA
Description
Bass management mix scale adjustment
0: -12 dB scaling on satellite channels in config #1
1: no scaling on satellite channels in config #1
Bit RW RST
Name
4 RW 0
AMAME
Description
AutoMode AM enable
0: switching frequency determined by PWMS settings
1: switching frequency determined by AMAM settings
AMAM[2:0]
000
001
010
011
100
101
110
48 kHz/96 kHz input Fs
0.535 MHz - 0.720 MHz
0.721 MHz - 0.900 MHz
0.901 MHz - 1.100 MHz
1.101 MHz - 1.300 MHz
1.301 MHz - 1.480 MHz
1.481 MHz - 1.600 MHz
1.601 MHz - 1.700 MHz
44.1 / 88.2 kHz input Fs
0.535 MHz - 0.670 MHz
0.671 MHz - 0.800 MHz
0.801 MHz - 1.000 MHz
1.001 MHz - 1.180 MHz
1.181 MHz - 1.340 MHz
1.341 MHz - 1.500 MHz
1.501 MHz - 1.700 MHz
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Doc ID 022570 Rev 2
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