STA323W datasheet(53/77 Pages) STMICROELECTRONICS

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STA323W

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7.8.2

AutoModes™ AM/pre-scale/bass management scale (address 0x0C)

When DDX® is used with an AM radio tuner, it is recommended to use the AMAM bits to

automatically adjust the output PWM switching rate so that it depends on the specific radio

frequency that the tuner is receiving. The values used in AMAM are also dependent upon

the sample rate that is determined by the ADC used.

Table 55.

AMPS - AutoModes™ auto pre scale

Bit

R/W

RST

Name

Description

AMPS

AutoMode pre-scale

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

1: User defined pre-scale when AMEQ neq 00

XO3

XO2

XO1

XO0

AMAM2

AMAM1

AMAM0

AMAME

000

Table 56.

AutoModes™ AM switching enable

Bit

R/W

RST

Name

Description

AMAME

0: switching frequency determined by PWMS setting

1: switching frequency determined by AMAM settings

3:1

000

AMAM[2:0]

Default: 000

Table 57.

AutoModes™ AM switching frequency selection

AMAM[2:0]

48 kHz/96 kHz input fs

44.1 kHz/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

Table 58.

AutoModes™ crossover setting

Bit

R/W

RST

Name

Description

7:4

XO[3:0]

000: user defined crossover coefficients are used

Otherwise: preset coefficients are used for the required

crossover setting

Table 59.

Crossover frequency selection

XO[2:0]

Bass management - crossover frequency

0000

User

0001

80 Hz

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