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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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WM8772SEDS/RV Fiches technique(PDF) 61 Page - Wolfson Microelectronics plc |
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WM8772SEDS/RV Fiches technique(HTML) 61 Page - Wolfson Microelectronics plc |
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61 / 73 page  Production Data WM8772EFT – 32 LEAD TQFP w PD Rev 4.2 October 2005 61 DAC OUTPUT PHASE The DAC Phase control word determines whether the output of each DAC is non-inverted or inverted REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION Bit DAC Phase 0 DAC1L/R 1 = invert 1 DAC2L/R 1 = invert 0000011 DAC Phase 8:6 PHASE [2:0] 000 2 DAC3L/R 1 = invert DIGITAL ZERO CROSS-DETECT The Digital volume control also incorporates a zero cross detect circuit which detects a transition through the zero point before updating the digital volume control with the new volume. This is enabled by control bit DZCEN. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0001001 DAC Control 0 ZCD 0 DAC Digital Volume Zero Cross Disable: 0: Zero cross detect enabled 1: Zero cross detect disabled MUTE FLAG OUTPUT The DZFM control bits allow the selection of the six DAC channel zero flag bits for output on the MUTEB pin. A ‘1’ on MUTE indicates 1024 consecutive zero input samples to the DAC channels selected. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0001001 Zero Flag 2:1 DZFM[1:0] 00 Selects the output MUTE pin (A ‘1’ indicates 1024 consecutive zero input samples on the DAC channels selected. 00: All channels zero 01: Channel 1 zero 10: Channel 2 zero 11: Channel 3 zero DAC MUTE MODES The WM8772EFT has individual mutes for each of the three DAC channels. Setting MUTE for a channel will apply a ‘soft’ mute to the input of the digital filters of the channel muted. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0001001 DAC Mute 5:3 DMUTE [2:0] 000 DAC Soft Mute Select DMUTE [2:0] DAC CHANNEL 1 DAC CHANNEL 2 DAC CHANNEL 3 000 Not MUTE Not MUTE Not MUTE 001 MUTE Not MUTE Not MUTE 010 Not MUTE MUTE Not MUTE 011 MUTE MUTE Not MUTE 100 Not MUTE Not MUTE MUTE 101 MUTE Not MUTE MUTE 110 Not MUTE MUTE MUTE |
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