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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8351 датащи(PDF) 77 Page - Wolfson Microelectronics plc |
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WM8351 датащи(HTML) 77 Page - Wolfson Microelectronics plc |
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77 / 330 page  Production Data WM8351 w PD, April 2012, Rev 4.5 77 13.7.4 DAC OUTPUT PHASE AND MONO MIXING The digital audio data is converted to oversampled bit streams in the on-chip 24-bit digital interpolation filters. The bitstream data enters two multi-bit, sigma-delta DACs, which convert them to high quality analogue audio signals. The multi-bit DAC architecture reduces high frequency noise and sensitivity to clock jitter. It also uses a Dynamic Element Matching technique for high linearity and low distortion. In normal operation, the left and right channel digital audio data is converted to analogue in two separate DACs. It is also possible for the DACs to output a mono mix of left and right channels, using DAC_MONO. Both DACs must be enabled for this mono mix to function. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R48 (30h) DAC Control 13 DAC_MONO 0 Adds left and right channel and halves the resulting output to create a mono output 1 DACL_DATINV 0 DAC data left channel polarity 0 = Normal 1 = Inverted 0 DACR_DATINV 0 DAC data right channel polarity 0 = Normal 1 = Inverted Table 35 DAC Mono Mix and Phase Invert Select 13.7.5 DAC STOPBAND ATTENUATION The DAC digital filter type is selected by the DAC_SB_FILT register bit as shown in Table 36. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R59 (3Bh) DAC Digital Control 12 DAC_SB_FILT 0 Selects DAC filter characteristics 0 = Normal mode 1 = Sloping stopband mode Table 36 DAC Filter Selection |
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