STA32813TR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STA32813TR Datasheet PDF : 57 Pages
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Register description
STA328
6.8.2
AutoMode AM/pre-scale/bass management scale (addr 0x0C)
D7
XO3
0
D6
XO2
0
D5
XO1
0
D4
XO0
0
D3
AMAM2
0
D2
AMAM1
0
D1
AMAM0
0
D0
AMAME
0
Table 53. AutoMode AM switching enable
Bit R/W RST
Name
Description
0
RW 0
AMAME
3:1 RW 000 AMAM[2:0]
AutoMode AM enable
0: switching frequency determined by PWMS setting
1: switching frequency determined by AMAM settings
AM switching frequency setting
Default: 000
n
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
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.
Table 55. AutoMode crossover setting
Bit R/W RST
Name
Description
7:4 RW 0
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
0100
120 Hz
140 Hz
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