STA309A13TR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STA309A13TR Datasheet PDF : 67 Pages
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STA309A
Registers
7.2.6
Configuration register F (0x05)
D7
PWMS2
0
D6
PWMS1
0
D5
PWMS0
0
D4
BQL
0
D3
D2
D1
PSL
DEMP
DRC
0
0
0
D0
HPB
0
Table 27. HPB bit
Bit RW RST
Name
Description
0
RW
0
HPB
High-pass filter bypass bit:
1: bypass internal AC coupling digital high-pass filter
The STA309A features an internal digital high-pass filter for the purpose of AC coupling. The
purpose of this filter is to prevent DC signals from passing through a DDX amplifier. DC
signals can cause speaker damage.
If HPB = 1, then the filter that the high-pass filter utilizes is made available as user-
programmable biquad#1.
Table 28. DRC bit
Bit RW RST
Name
Description
1
RW
0
DRC
Dynamic range compression/anti-clipping:
0: limiters act in anti-clipping mode
1: limiters act in dynamic range compression mode
Both limiters can be used in one of two ways, anti-clipping or dynamic range compression.
When used in anti-clipping mode the limiter threshold values are constant and dependent on
the limiter settings.
In dynamic range compression mode the limiter threshold values vary with the volume
settings allowing a nighttime listening mode that provides a reduction in the dynamic range
regardless of the volume level.
Table 29. DEMP bit
Bit RW RST
Name
Description
2
RW
0
DEMP
De-emphasis:
0: no de-emphasis
1: de-emphasis
By setting this bit to one de-emphasis will implemented on all channels. When this is used it
takes the place of biquad #7 in each channel and any coefficients using biquad #1 will be
ignored. DSPB (DSP bypass) bit must be set to 0 for de-emphasis to function.
Doc ID 13855 Rev 4
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