STA311BTR datasheet(38/102 Pages) STMICROELECTRONICS

38 / 102 page

Registers

STA311B

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DocID024340 Rev 1

Setting the MPC bit turns on special processing that corrects the STA50x power device at

high power. This mode should lower the THD+N of a full STA50x FFX system at maximum

power output and slightly below. This mode will only be operational in OM[1,0] = 01.

8.2.5

Configuration register E (0x04)

Each individual channel output can be set to output a binary PWM stream. In this mode

output A of a channel will be considered the positive output and output B is the negative

inverse.

8.2.6

Configuration register F (0x05)

The STA311B 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 an FFX 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.

C8BO

C7BO

C6BO

C5BO

C4BO

C3BO

C2BO

C1BO

000

Bit

RST

Name

Description

0RW

C1BO

Channels 1, 2, 3, 4, 5, 6, 7, and 8 binary output mode

enable bits. A setting of 0 indicates ordinary FFX

tristate output. A setting of 1 indicates binary output

mode.

1RW

C2BO

2RW

C3BO

3RW

C4BO

4RW

C5BO

5RW

C6BO

6RW

C7BO

7RW

C8BO

PWMS2

PWMS1

PWMS0

BQL

PSL

DEMP

DRC

HPB

000

Bit

RST

Name

Description

0RW

HPB

High-pass filter bypass bit: setting of one bypasses

internal AC coupling digital high-pass filter

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