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STA328 Arkusz danych(PDF) 24 Page - STMicroelectronics

Numer części STA328
Szczegółowy opis  2.1 HIGH EFFICIENCY DIGITAL AUDIO SYSTEM
PDF  41 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA328 Arkusz danych(HTML) 24 Page - STMicroelectronics

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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
00
User Programmable GC
01
AC No Clipping
10
AC Limited Clipping (10%)
11
DRC Nighttime Listening Mode
BIT
R/W
RST
NAME
DESCRIPTION
0
R/W
0
AMPS
AutoMode Pre-Scale
0 – -18dB used for Pre-scale when AMEQ /= 00
1 – User Defined Pre-scale when AMEQ /= 00
D7
D6
D5
D4
D3
D2
D1
D0
XO3
XO2
XO1
XO0
AMAM2
AMAM1
AMAM0
AMAME
000000
00
BIT
R/W
RST
NAME
DESCRIPTION
0
R/W
0
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
0
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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