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WM9711 Datasheet(PDF) 28 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 28 Page - Wolfson Microelectronics plc |
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28 / 66 page  WM9711L Production Data w PD Rev 4.1 April 2004 28 ANALOGUE AUDIO OUTPUTS The following sections give an overview of the analogue audio output pins. For more information on recommended external components, please refer to the “Applications Information” section. HEADPHONE OUTPUTS – HPOUTL AND HPOUTR The HPOUTL and HPOUTR (pins 39 and 41) are designed to drive a 16 Ω or 32Ω headphone or a line output. They can also be used as line-out pins. The output signal is produced by the headphone mixer. The signal volume on HPOUTL and HPOUTR can be independently adjusted under software control by writing to register 04h. When HPOUTL and HPOUTR are not used, the output drivers can be disabled to save power (see “Power Management” section). Both pins remain at the same DC level (the reference voltage VREF) when they are disabled, so that no click noise is produced. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 15 MUTE 1 Mute HPOUTL and HPOUTR 1: Mute (OFF) 0: No Mute (ON) 13:8 HPOUTLVOL 000000 (0dB) HPOUTL Volume 000000: 0dB (maximum) 000001: -1.5dB … (1.5dB steps) 011111: -46.5dB 1xxxxx: -46.5dB 7 ZC 0 Zero Cross Enable 0: Change gain immediately 1: Change gain only on zero crossings, or after time-out 04h HPOUTL / HPOUTR Volume 5:0 HPOUTRVOL 00000 (0dB) HPOUTR Volume Similar to HPOUTLVOL Table 15 HPOUTL / HPOUTR Control |
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Similar Description - WM9711 |
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