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WM8959 Datasheet(PDF) 67 Page - Wolfson Microelectronics plc |
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WM8959 Datasheet(HTML) 67 Page - Wolfson Microelectronics plc |
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67 / 155 page  Pre-Production WM8959 w PP, May 2008, Rev 3.1 67 ANALOGUE OUTPUTS The speaker, headphone and line outputs are highly configurable and may be used in many different ways. SPEAKER OUTPUT CONFIGURATIONS The speaker outputs SPKP and SPKN are driven by the speaker mixer SPKMIX, and speaker volume control SPKPGA, which can output a mix that is any combination of the following signals: • Left DAC and Right DAC outputs • LOMIX and ROMIX outputs via volume controls LOPGA and ROPGA • Line inputs LIN2 and RIN2 • Output from left and right input mixers (AINLMUX & AINRMUX) The speaker mixer is controlled as described under “Output Signal Path”. The speaker mixer output can be attenuated to avoid clipping when mixing multiple signal inputs. Fine adjustment of the speaker output can be made by the speaker volume control SPKPGA. The speaker outputs SPKP and SPKN operate in a BTL configuration in Class AB and Class D amplifier modes. The mode is selected by register bit CDMODE. The outputs are capable of driving 1W into an 8 Ω BTL load (or 500mW in class AB mode for thermal reasons) at room temperature. For performance at higher temperatures, see Error! Reference source not found. in the “Recommended Operating Conditions” section. Ultra-low leakage and high PSRR allow the speaker supply SPKVDD to be directly connected to a lithium battery. Six levels of AC and DC signal boost are provided in order to deliver maximum output power for many commonly-used SPKVDD/AVDD combinations. These boost options are available in both Class AB and Class D modes. The AC and DC gain levels from 1.0x to 1.8x are selected using register bits ACGAIN and DCGAIN. To prevent pop noise, DCGAIN and ACGAIN should not be modified while the speaker outputs are enabled. Note that an appropriate SPKVDD supply voltage must be provided to prevent waveform clipping when speaker boost is used. Figure 30 Speaker Boost Operation SPKP SPKN SPKATTN[1:0] SPKVOL[6:0] ACGAIN[2:0] SPKGND SPKVDD AGND AVDD DCGAIN[2:0] or ACGAIN[2:0] 000 = 1.00x 001 = 1.27x 010 = 1.40x 011 = 1.52x 100 = 1.67x 101 = 1.80x VMID AVDD AGND DCGAIN[2:0] VMID x DCGAIN VMID x DCGAIN SPKVDD Signal x ACGAIN BTL Connection provides an additional 6dB gain SPEAKER MIXER |
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