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WM1811A Datasheet(PDF) 125 Page - Wolfson Microelectronics plc |
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WM1811A Datasheet(HTML) 125 Page - Wolfson Microelectronics plc |
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125 / 328 page  Production Data WM1811A w PD, November 2013, Rev 4.1 125 Eight levels of AC signal boost are provided in order to deliver maximum output power for many commonly-used SPKVDD/AVDD1 combinations. (Note that SPKVDD1 powers the Left Speaker driver, and SPKVDD2 powers the Right Speaker driver; it is assumed that SPKVDD1 = SPKVDD2 = SPKVDD.) The signal boost options are available. The AC boost levels from 0dB to +12dB are selected using register bits SPKOUTL_BOOST and SPKOUTR_BOOST. To prevent pop noise, SPKOUTL_BOOST and SPKOUTR_BOOST should not be modified while the speaker outputs are enabled. Figure 31 illustrates the speaker outputs and the mixing and gain/boost options available. Ultra-low leakage and high PSRR allow the speaker supply SPKVDD to be directly connected to a lithium battery. Note that an appropriate SPKVDD supply voltage must be provided to prevent waveform clipping when speaker boost is used. DC gain is applied automatically, with a shift from VMID to SPKVDD/2. This provides optimum signal swing for maximum output power. The AC and DC gain functions are illustrated in Figure 31. Figure 31 Speaker Output Configuration and AC Boost Operation |
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