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WM8904ECS/R 数据表(PDF) 71 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 71 Page - Wolfson Microelectronics plc |
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71 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 71 OUTPUT SIGNAL PATH The outputs HPOUTL and LINEOUTL are normally derived from the Left DAC output, whilst the outputs HPOUTR and LINEOUTR are normally derived from the Right DAC output, as illustrated in Figure 37. A multiplexer is provided on each output path to select the BYPASSL or BYPASSR analogue input signals in place of the DAC outputs. A feedback path for common mode noise rejection is provided at HPOUTFB and LINEOUTFB for the Headphone and Line outputs respectively. This pin must be connected to ground for normal operation. Each analogue output can be separately enabled; independent volume control is also provided for each output. The output signal paths and associated control registers are illustrated in Figure 37. See “Analogue Outputs” for details of the external connections to these outputs. HPOUTL HPOUTFB CHARGE PUMP HPOUTR DC Servo AVDD DCVDD HPOUT and LINEOUT drivers BYPASSL BYPASSR HPOUTL_MUTE HPOUT_VU HPOUTLZC HPOUTL_VOL (-57dB to +6dB, 1 dB steps) HPOUTR_MUTE HPOUT_VU HPOUTRZC HPOUTR_VOL (-57dB to +6dB, 1 dB steps) LINEOUTL_MUTE LINEOUT_VU LINEOUTLZC LINEOUTL_VOL (-57dB to +6dB, 1 dB steps) LINEOUTR_MUTE LINEOUT_VU LINEOUTRZC LINEOUTR_VOL (-57dB to +6dB, 1 dB steps) HPL_PGA_ENA HPR_PGA_ENA LINEOUTL_PGA_ENA LINEOUTR_PGA_ENA LINEOUTL LINEOUTFB LINEOUTR DAC L DAC R M U X M U X M U X M U X HPL_BYP_ENA HPR_BYP_ENA LINEOUTL_BYP_ENA LINEOUTR_BYP_ENA Figure 37 Output Signal Path and Control Registers |
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