STA323W datasheet(24/41 Pages) STMICROELECTRONICS

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STA323W

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Table 20. AutoMode Gain Compression/Limiters

7.9.2 AMPS – AutoMode Auto Prescale

7.9.3 Register – AutoMode AM/Pre-Scale/Bass Management Scale (Address 0Ch)

7.9.3.1AutoMode AM Switching Enable

Table 21. AutoMode AM Switching Frequency Selection

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

ically 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.

7.9.3.2AutoMode Crossover Setting

AMGC (1...0)

Mode

User Programmable GC

AC No Clipping

AC Limited Clipping (10%)

DRC Nighttime Listening Mode

BIT

R/W

RST

NAME

DESCRIPTION

R/W

AMPS

AutoMode Pre-Scale

0 – -18dB used for Pre-scale when AMEQ /= 00

1 – User Defined Pre-scale when AMEQ /= 00

XO3

XO2

XO1

XO0

AMAM2

AMAM1

AMAM0

AMAME

0000

BIT

R/W

RST

NAME

DESCRIPTION

R/W

AMAME

AutoMode AM Enable

0 – Switching Frequency Determined by PWMS Setting

1 – Switching Frequency Determined by AMAM Settings

3…1

R/W

000

AMAM (2…0)

AM Switching Frequency Setting

Default: 000

AMAM (2..0)

48kHz/96kHz Input Fs

44.1kHz/88.2kHz Input Fs

000

0.535MHz – 0.720MHz

0.535MHz – 0.670Mhz

001

0.721MHz – 0.900MHz

0.671MHz – 0.800MHz

010

0.901MHz – 1.100MHz

0.801MHz – 1.000MHz

011

1.101MHz – 1.300MHz

1.001MHz – 1.180MHz

100

1.301MHz – 1.480MHz

1.181MHz – 1.340Mhz

101

1.481MHz – 1.600MHz

1.341MHz – 1.500MHz

110

1.601MHz – 1.700MHz

1.501MHz – 1.700MHz

BIT

R/W

RST

NAME

DESCRIPTION

7…4

R/W

XO (3…0)

AutoMode Crossover Frequency Selection

000 – User Defined Crossover coefficients are used

Otherwise – Preset coefficients for the crossover setting desired

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