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STA339BWS 数据表(PDF) 34 Page - STMicroelectronics

部件名 STA339BWS
功能描述  FFX with 100-dB SNR and dynamic range
PDF  79 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STA339BWS 数据表(HTML) 34 Page - STMicroelectronics

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Register description
STA339BWS
34/79
DocID015276 Rev 8
Setting the MPC bit turns on special processing that corrects the STA339BWS power device
at high power. This mode should lower the THD+N of a full FFX 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 has no effect on channels 3 and 4, the
line-out channels.
Noise-shaper bandwidth selection
AM mode enable
STA339BWS features a FFX processing mode that minimizes the amount of noise
generated in frequency range of AM radio. This mode is intended for use when FFX is
operating in a device with an AM tuner active. The SNR of the FFX 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 37. Noise-shaper bandwidth selection
Bit
R/W
RST
Name
Description
2
R/W
0
NSBW
1: third-order NS
0: fourth-order NS
Table 38. AM mode enable
Bit
R/W
RST
Name
Description
3
R/W
0
AME
0: normal FFX operation.
1: AM reduction mode FFX operation
Table 39. PWM speed mode
Bit
R/W
RST
Name
Description
4
R/W
0
PWMS
0: normal speed (384 kHz) all channels
1: odd speed (341.3 kHz) all channels
Table 40. Distortion compensation variable enable
Bit
R/W
RST
Name
Description
5
R/W
0
DCCV
0: use preset DC coefficient
1: use DCC coefficient



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