STA308A datasheet(39/63 Pages) STMICROELECTRONICS

39 / 63 page

STA308A

Registers

39/63

When AMBMXE = 1, biquad #7 on channels 1-6 are utilized for 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 are limited to this region.

7.2.34

AUTO3 - AutoMode AM/pre-Scale/bass management scale (0x21)

Bitfield

FSS - front speaker size

Large

Small

SUB - subwoofer

Off

AMAM2

AMAM1

AMAM0

AMAME

MSA

AMPS

Bit

RST

Name

Description

0RW

AMPS

AutoMode pre-scale

0: -18 dB used for pre-scale when AMEQ = 00

1: user defined pre-scale when AMEQ = 00

Bit

RST

Name

Description

1RW

MSA

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

RST

Name

Description

4RW

AMAME

AutoMode AM enable

0: switching frequency determined by PWMS settings

1: switching frequency determined by AMAM settings

AMAM[2:0]

48 kHz/96 kHz input Fs

44.1 / 88.2 kHz input Fs

000

0.535 MHz - 0.720 MHz

0.535 MHz - 0.670 MHz

001

0.721 MHz - 0.900 MHz

0.671 MHz - 0.800 MHz

010

0.901 MHz - 1.100 MHz

0.801 MHz - 1.000 MHz

011

1.101 MHz - 1.300 MHz

1.001 MHz - 1.180 MHz

100

1.301 MHz - 1.480 MHz

1.181 MHz - 1.340 MHz

101

1.481 MHz - 1.600 MHz

1.341 MHz - 1.500 MHz

110

1.601 MHz - 1.700 MHz

1.501 MHz - 1.700 MHz

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