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STA369BWS データシート(PDF) 77 Page - STMicroelectronics |
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STA369BWS データシート(HTML) 77 Page - STMicroelectronics |
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77 / 89 page  STA369BWS Register description Doc ID 16861 Rev 4 77/89 Figure 24. External active filter with connection for F3X output The two register bits work as per the following table. Channel PWM enable (CPWMEN) bit This bit, when set, activates a mute output when the volume reaches a value lower than -76 dBFS. Output power boosting (BOOST) bit The bit, when enabled, allows the maximum PWM modulation index to be increased from the default value to 100%. In this case the maximum unclipped output power can be increased accordingly. Note that this feature does not add any gain to the signal, but just extends the maximum unclipped level of STA369BWS. Table 87. F3X bits configuration F3X[1] F3X[0] Description 0 0 No F3X applied 0 1 F3X applied 1 0 Reserved 1 1 Reserved VA VA/2 17 18 CH3 4.7KOhm 4.7KOhm 470pF 470nF 20KOhm 30KOhm 470pF VA VA/2 19 20 CH4 4.7KOhm 4.7KOhm 470pF 470nF 20KOhm 30KOhm 470pF VA VA/2 17 18 CH3 4.7KOhm 4.7KOhm 470pF 470nF 20KOhm 30KOhm 470pF VA VA/2 17 18 CH3 4.7KOhm 4.7KOhm 470pF 470nF 20KOhm 30KOhm 470pF VA VA/2 19 20 CH4 4.7KOhm 4.7KOhm 470pF 470nF 20KOhm 30KOhm 470pF VA VA/2 19 20 CH4 4.7KOhm 4.7KOhm 470pF 470nF 20KOhm 30KOhm 470pF |
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