STA309A datasheet(29/67 Pages) STMICROELECTRONICS

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STA309A

Registers

29/67

7.2.6

Configuration register F (0x05)

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.

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.

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.

PWMS2

PWMS1

PWMS0

BQL

PSL

DEMP

DRC

HPB

000

Table 27.

HPB bit

Bit

RST

Name

Description

0RW

HPB

High-pass filter bypass bit: setting of one bypasses

internal AC coupling digital high-pass filter

Table 28.

DRC bit

Bit

RST

Name

Description

DRC

Dynamic range compression/anti-clipping

0: limiters act in anti-clipping mode

1: limiters act in dynamic range compression mode

Table 29.

DEMP bit

Bit

RST

Name

Description

2RW

DEMP

De-emphasis:

0: no de-emphasis

1: de-emphasis

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