STA328 datasheet(36/57 Pages) STMICROELECTRONICS

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STA328

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6.8.2

AutoMode AM/pre-scale/bass management scale (addr 0x0C)

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

bits to automatically adjust the output PWM switching rate dependent upon the specific

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

upon the sample rate determined by the ADC used.

XO3

XO2

XO1

XO0

AMAM2

AMAM1

AMAM0

AMAME

000

Table 53.

AutoMode AM switching enable

Bit

R/W

RST

Name

Description

AMAME

AutoMode AM enable

0: switching frequency determined by PWMS setting

1: switching frequency determined by AMAM settings

3:1

000

AMAM[2:0]

AM switching frequency setting

Default: 000

Table 54.

AutoMode 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 55.

AutoMode crossover setting

Bit

R/W

RST

Name

Description

7:4

XO[3:0]

AutoMode crossover frequency selection

000: user defined crossover coefficients are used

Otherwise: preset coefficients for the crossover setting

desired

Table 56.

Crossover frequency selection

XO[2:0]

Bass management - Crossover frequency

0000

User

0001

80 Hz

0010

100 Hz

0011

120 Hz

0100

140 Hz

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