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STA333W 数据表(PDF) 29 Page - STMicroelectronics

部件名 STA333W
功能描述  2 channel high-efficiency digital audio system Sound Terminal
PDF  50 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STA333W 数据表(HTML) 29 Page - STMicroelectronics

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STA333W
Register description
50
Max power correction
Setting the MPC bit turns on special processing that corrects the STA333W power device at
high power. This mode lowers the THD+N of a full DDX system at maximum power output
and slightly below. If enabled, MPC is operational in all output modes except tapered
(OM[1:0] = 01) and binary. When OCFG = 00, MPC does not affect channels 3 and 4, the
line-out channels.
Noise-shaper bandwidth selection
AM mode enable
The STA333W features a DDX processing mode that minimizes the amount of noise
generated in frequency range of AM radio. This mode is intended for use when DDX is
operating in a device with an AM tuner active. The SNR of the DDX processing is reduced to
approximately 83 dB in this mode, which is still greater than the SNR of AM radio.
PWM speed mode
Distortion compensation variable enable
Table 26. Max power correction
Bit
R/W
RST
Name
Description
1R/W
1MPC
1: enable power bridge correction for THD reduction
near maximum power output.
Table 27. Noise-shaper bandwidth selection
Bit
R/W
RST
Name
Description
2R/W
0NSBW
1: 3rd order NS
0: 4th order NS
Table 28. AM mode enable
Bit
R/W
RST
Name
Description
3R/W
0AME
0: normal DDX operation
1: AM reduction mode DDX operation
Table 29. PWM speed mode
Bit
R/W
RST
Name
Description
4R/W
0PWMS
0: normal speed (384 kHz) all channels
1: odd speed (341.3 kHz) all channels
Table 30. Distortion compensation variable enable
Bit
R/W
RST
Name
Description
5R/W
0DCCV
0: uses preset DC coefficient.
1: uses DCC coefficient.



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